Zone 183, Master Map
+06°00'
Normal View
+04°00'
Orion
ω
i
f
c
ψ2
ρ
ψ1
M78
δ
+00°00'
j
π6
d
g
+02°00'
Zone Master, Normal View, 10 deg FOV
Mintaka
Horsehead Nebula
Alnitak
η
σ
k
e
h
Eridanus
M43
β
θ1 Trapezium
Great Nebula in Orionθ2 Orion Nebula
ι
06h 00m
05h 52m
05h 44m
Cursa
M42
05h 36m
05h 28m
05h 20m
05h 12m
05h 04m
-04°00'
Flame Nebula ζ
-02°00'
Alnilamε
Zone 183, Map 1
Normal Image
+05°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
STF 678
A. G. 87
Baillaud 2627
+04°00'
A. G. 85
STF 682 rej
STF 627
Kustner 86
+03°00'
STF 628 rej
A. G. 89
Rho Ori
+02°00'
ρ
π6
NGC 1762
05h 18m
05h 12m
05h 06m
STF 630
05h 00m
Zone 183, Map 1
Mirror Image
+05°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
STF 678
A. G. 87
Baillaud 2627
STF 682 rej
+04°00'
A. G. 85
STF 627
Kustner 86
A. G. 89
ρ
+03°00'
STF 628 rej
+02°00'
Rho Ori
STF 630
05h 00m
NGC 1762
05h 06m
05h 12m
05h 18m
Zone 183, Map 2
Normal Image
+02°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
π6
+01°00'
NGC 1762
STF 630
-01°00'
+00°00'
STF 652
05h 18m
05h 12m
05h 06m
05h 00m
Zone 183, Map 2
Mirror Image
NGC 1762
+01°00'
STF 630
+02°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
-01°00'
+00°00'
STF 652
05h 00m
05h 06m
05h 12m
05h 18m
Zone 183, Map 3
Normal Image
-02°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
Bur 1006
Jonckheere 307
-03°00'
STF 639
A 53
NGC 1788
-04°00'
Barton 534
Eridanus
-05°00'
66 Eri
h2257
Beta Eri
Cursaβ
05h 18m
05h 12m
h31
05h 06m
05h 00m
Zone 183, Map 3
Mirror Image
-02°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
Bur 1006
STF 639
A 53
-03°00'
Jonckheere 307
NGC 1788
-04°00'
Barton 534
Eridanus
h2257
β
h31
05h 00m
05h 06m
-05°00'
66 Eri
Beta Eri
Cursa
05h 12m
05h 18m
Zone 183, Map 4
Normal Image
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
Hipparcos 738
+05°00'
OS 106
+04°00'
ω
Baillaud 2149
23 Ori
33 Ori
+03°00'
STF 721
Psi 2 Oriψ2
STF 712
Sh 61
Baillaud 1667
Neat
Formation!
A. G. 96
STF 702
STF 708
+02°00'
STF 756 rej
ψ1
25 Ori
Baillaud 1294 h2267
05h 36m
05h 30m
05h 24m
Zone 183, Map 4
Mirror Image
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
OS 106
ω
STF 682 rej
+04°00'
+05°00'
Hipparcos 738
Baillaud 2149
23 Ori
33 Ori
STF 721
Psi 2 Ori
STF 712
Baillaud 1667
+03°00'
ψ2
Sh 61
Neat
Formation!
A. G. 96
STF 702
ψ1
+02°00'
STF 756 rej
STF 708
25 Ori
h2267
05h 24m
05h 30m
Baillaud 1294
05h 36m
Zone 183, Map 5
Normal Image
STF 708
+02°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
ψ1
25 Ori
Baillaud 1294 h2267
STF 700
OSS 65
+00°00'
Pritchett 1
STF 741
STF 757
+01°00'
Webb 3
Mintakaδ
Delta Ori
h697
Baillaud 670
Harvard 75
ε
H V 118
Epsilon Ori
-01°00'
Winnecke 2
STF 751
Collinder 70
31 Ori
Alnilam
NGC 1990
STF 734
h702
Dembowski 8
ζ
Alnitak
05h 36m
05h 30m
STF 693
05h 24m
Zone 183, Map 5
Mirror Image
ψ1
+02°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
STF 708
25 Ori
h2267
Baillaud 1294
+01°00'
Webb 3
STF 700
+00°00'
OSS 65
Pritchett 1
Delta Ori
STF 741
STF 757
Mintakaδ
h697
Baillaud 670
Winnecke 2
-01°00'
H V 118
31 Ori
STF 751
Collinder 70
Harvard 75
Epsilon Ori ε
NGC 1990
Alnilam
STF 734
h702
STF 693
05h 24m
ζ
Dembowski 8
05h 30m
05h 36m
Zone 183, Map 6
Normal Image
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
h702
Dembowski 8
ζ
Alnitak
STF 693
STF 731
η
-02°00'
STF 734
Eta Ori
Sigma Ori σ
STF 761
-03°00'
H IV 68
-04°00'
Engelmann 20
See detail map,
next page
STF 750
STF 743
h2270
NGC 1981
STF 746 rej
NGC 1973
NGC 1975
Webb 4
NGC 1982
Trapeziumθ2
South 490 θ1
Theta 2 Ori
05h 36m
-05°00'
42 Ori
NGC 1977
Theta 1 Ori
SI 17
NGC 1976
NGC 1924
05h 30m
05h 24m
Zone 183, Map 6
Mirror Image
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
h702
STF 693
ζ
Dembowski 8
STF 731
-02°00'
STF 734
Eta Ori η
σ
Sigma Ori
STF 761
-03°00'
H IV 68
A 53
-04°00'
Engelmann 20
STF 750
STF 743
h2270
See detail map,
next page
NGC 1981
Webb 4
STF 746 rej
NGC 1973
NGC 1975
Theta 1 Ori
NGC 1924
θ1θ2
Theta 2 Ori
05h 24m
05h 30m
-05°00'
42 Ori
NGC 1977
NGC 1982
South 490
Trapezium
NGC 1976
05h 36m
Zone 183, Map 6 Inset
Normal Image
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
STF 750
STF 743
NGC 1981
NGC 1975
STF 746 rej
NGC 1973
42 Ori
NGC 1977
Zone 183, Map 6 Inset
Mirror Image
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
STF 750
STF 743
NGC 1981
STF 746 rej
NGC 1975
NGC 1973
42 Ori
NGC 1977
Zone 183, Map 7
Normal Image
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
+05°00'
STF 815
STF 818
STF 797
Baillaud 2643
ω
STF 789 rej
STF 788
+02°00'
+03°00'
Jonckheere 36
+04°00'
Baillaud 2644
59 Ori
h2283
06h 00m
05h 54m
05h 48m
05h 42m
Zone 183, Map 7
Mirror Image
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
+05°00'
STF 815
STF 818
STF 797
Baillaud 2644
+04°00'
Baillaud 2643
ω
STF 789 rej
Jonckheere 36
+02°00'
+03°00'
STF 788
59 Ori
h2283
05h 42m
05h 48m
05h 54m
06h 00m
Zone 183, Map 8
Normal Image
+02°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
59 Ori
+01°00'
h2283
60 Ori
NGC 2112
Bur 1189
NGC 2067
NGC 2068
+00°00'
NGC 2071
STF 782
-01°00'
STF 827 rej
STF 819
Baillaud 312
STF 826
IC 432
STF 809
Zeta Ori ζ
Rossiter 4290
06h 00m
Alnitak
05h 54m
05h 48m
05h 42m
Zone 183, Map 8
Mirror Image
+02°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
59 Ori
+01°00'
h2283
60 Ori
NGC 2112
NGC 2067
NGC 2068
-01°00'
STF 782
Bur 1189
+00°00'
NGC 2071
STF 819
Baillaud 312
IC 432
ζ
STF 826
STF 809
Alnitak
Zeta Ori
05h 42m
05h 48m
05h 54m
06h 00m
Zone 183, Map 9
Normal Image
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
Zeta Ori ζ
Alnitak
Rossiter 4290
NGC 2023
-02°00'
IC 432
STF 809
IC 435
A 2918 NGC 2024
-03°00'
Sigma Ori σ
STF 761
STF 792
-04°00'
h2280
Monoceros
STF 790
Schjellerup 3
A 322
-05°00'
h2289
06h 00m
05h 54m
05h 48m
05h 42m
Zone 183, Map 9
Mirror Image
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
ζ
-02°00'
IC 432
Alnitak
Zeta Ori
NGC 2023
IC 435
NGC 2024
A 2918
-03°00'
Sigma Ori
STF 761
h2280
-04°00'
STF 792
Monoceros
STF 790
Schjellerup 3
-05°00'
A 322
05h 42m
05h 48m
05h 54m
06h 00m
Zone 183
88 Double Stars, 12 Nebulae,
3 Open Clusters, 1 Galaxy
Flamsteed
C
23 Ori................................................... 17
25 Ori................................................... 26
31 Ori................................................... 32
33 Ori................................................... 22
42 Ori................................................... 45
59 Ori................................................... 54
60 Ori................................................... 55
66 Eri ................................................... 12
Collinder 70 ......................................... 36
D
Delta Ori .............................................. 23
Dembowski 8 ....................................... 38
E
Engelmann 20 ...................................... 43
Epsilon Ori........................................... 30
Eta Ori.................................................. 44
A
A 2918 ................................................. 61
A 322 ................................................... 62
A 53 ..................................................... 15
A. G. 85 ................................................. 6
A. G. 87 ................................................. 4
A. G. 89 ................................................. 7
A. G. 96 ............................................... 19
H
H IV 68 ................................................ 40
H V 118................................................ 27
h2257 ................................................... 14
h2267 ................................................... 33
h2270 ................................................... 41
h2280 ................................................... 64
h2283 ................................................... 56
h697 ..................................................... 34
h702 ..................................................... 38
Harvard 75 ........................................... 31
B
Baillaud 1294....................................... 29
Baillaud 1667....................................... 20
Baillaud 2149....................................... 21
Baillaud 2627......................................... 7
Baillaud 2643....................................... 50
Baillaud 2644....................................... 50
Baillaud 312......................................... 55
Baillaud 670......................................... 28
Barton 534 ........................................... 14
Bur 1006 .............................................. 13
Bur 1189 .............................................. 54
I
IC 432 .................................................. 58
IC 435 .................................................. 65
J
Jonckheere 307 .................................... 13
Jonckheere 36 ...................................... 51
-1-
Zone 183
K
STF 682 rej ............................................ 6
STF 693................................................ 43
STF 700................................................ 25
STF 702................................................ 18
STF 708................................................ 32
STF 712................................................ 21
STF 721................................................ 17
STF 731................................................ 40
STF 734................................................ 35
STF 741................................................ 33
STF 743................................................ 45
STF 746 rej .......................................... 41
STF 750................................................ 42
STF 751................................................ 27
STF 756 rej .......................................... 20
STF 757................................................ 29
STF 761................................................ 39
STF 782................................................ 52
STF 788................................................ 49
STF 789 rej .......................................... 48
STF 790................................................ 60
STF 792................................................ 61
STF 797................................................ 49
STF 809................................................ 52
STF 818................................................ 48
STF 819................................................ 53
STF 826................................................ 56
Kustner 86.............................................. 5
N
NGC 1762............................................ 10
NGC 1788............................................ 16
NGC 1973............................................ 46
NGC 1975............................................ 47
NGC 1977............................................ 47
NGC 1981............................................ 46
NGC 1990............................................ 36
NGC 2023............................................ 65
NGC 2024............................................ 65
NGC 2067............................................ 59
NGC 2068............................................ 58
NGC 2071............................................ 57
NGC 2112............................................ 59
O
OSS 65................................................. 26
P
Pritchett 1............................................. 31
Psi 2 Ori ............................................... 22
R
Rho Ori .................................................. 5
S
W
Schjellerup 3 ........................................ 62
Sh 61 .................................................... 18
Sigma Ori............................................. 37
STF 627 ................................................. 3
STF 628 rej ............................................ 3
STF 630 ................................................. 9
STF 639 ............................................... 11
STF 652 ............................................... 10
STF 678 ................................................. 8
Webb 3................................................. 28
Webb 4................................................. 42
Winnecke 2 .......................................... 25
Z
Zeta Ori ................................................ 63
-2-
Zone 183
Zone 183, Map 1
Double Stars
Easy
STF 627
Rating: 3 E
ADS 3597; HD 32040; SAO 112305
Position: 0501+0337
A
B
Magnitude
6.65
7.03
Separation PA
—
—
21.3 =
260 =
Year
—
1991
Spectra
B9 Vn
B9 Vn
Colors
Y
G
Notes:
1831: 21.3 @ 260. 37 measurements. Both stars rotate extremely rapidly (340 and
352 km/sec respectively). Hipparcos/Tycho data show different distances for these stars;
they may be optical. However, the stars show similar proper motion.
Observations:
C8 at 83x. "A splendid pair," wrote Webb.
Scale Model (in which the Sun is a baseball):
Diameter: A = 1.17 inches; B = 1.20 inches.
Separation: AB = 4.65 miles.
Distance (LY): 140
Total luminosity (Suns): 5.6
STF 628 rej
Rating: 4 E
HD 32056; SAO 112306
Position: 0501+0316
A
B
Magnitude
8.10
9.71
Separation PA
—
—
22.7 47 =
-3-
Year
—
1991
Spectra
B9
Colors
W
R
Zone 183
Notes:
1902: 23.0 @ 47. 8 measurements. Hipparcos/Tycho data show different distances
for these stars; they may be optical. However, the stars show similar proper motion.
Observations:
C8 at 104x. It seems very faint for the listed magnitudes.
Scale Model (in which the Sun is a baseball):
Diameter: A = 5.06 inches.
Separation: AB = 26.6 miles.
Distance (LY): 750
Total luminosity (Suns): 32
A. G. 87
Rating: 4 E
HD 32351; SAO 112353
Position: 0503+0436
A
B
Magnitude
9.07
10.48
Separation PA
—
—
33.9 +
286 +
Year
—
1989
Notes:
1903: 31.2 @ 281. 5 measurements.
Observations:
C11 at 115x.
Scale Model (in which the Sun is a baseball):
Diameter: A = 18.0 inches.
Separation: AB = 18.4 miles.
Distance (LY): 347
Total luminosity (Suns): 2.82
-4-
Spectra
G0
Colors
pY
W
Zone 183
Rho Ori
17 Ori; STF 654; ADS 3797; HD 33856; SAO 112528
Rating: 4 E
Position: 0513+0251
A
B
C
Magnitude
4.59
8.29
11.33
Separation
—
7.0 182.4
PA
—
65 +
155
Year
—
1995
1913
Spectra
K3 II
F7 V
Colors
Y
B
?
Notes:
1831: 7.3 @ 61. 63 measurements.
AC 1 measurement.
Star A is a long-period spectroscopic binary with a period of 2.824 years. It is also an
infra-red source.
Observations:
C8 at 280x. Webb saw them as Y! and B. Others report (pO, B) or (O, bG).
Kustner 86
Rating: 4 E
HD 34212
Position: 0516+0259
A
B
Magnitude
9.49
10.03
Separation PA
—
—
36.1 117 +
Year
—
1991
Notes:
1901: 37.2 @ 115. 8 measurements.
The stars have different proper motions.
Observations:
C8 at 104x.
Scale Model (in which the Sun is a baseball):
Diameter: A = 22.8 inches.
Separation: AB = 65.4 miles.
Distance (LY): 1,160
Total luminosity (Suns): 32
-5-
Spectra
G5 V
Colors
W
W
Zone 183
STF 682 rej
Baillaud 2143; HD 34581; SAO 112618
Rating: 4 E
Position: 0519+0359
A
B
Magnitude
9.29
10.58
Separation PA
—
—
16.7 112 +
Year
—
1991
Spectra
F8 IV?
Colors
W
B
Notes:
1904: 18.9 @ 99. 6 measurements.
Observations:
C11 at 115x.
Scale Model (in which the Sun is a baseball):
Diameter: A = 12.4 inches.
Separation: AB = 22.4 miles.
Distance (LY): 860
Total luminosity (Suns): 15
A. G. 85
Rating: 5 E
ADS 3630; HD 32319; SAO 112346
Position: 0502+0419
A
B
Magnitude
9.49
10.44
Separation PA
—
—
9.4 176 -
Year
—
1991
Spectra
G0
Colors
W
?
Notes:
1900: 9.7 @ 177. 12 measurements. The stars share common proper motion.
Observations:
C8 at 104x. Faint, and in a sparse field.
Scale Model (in which the Sun is a baseball):
Diameter: A = 18.4 inches.
Separation: AB = 1.36 miles.
Distance (LY): 93
Total luminosity (Suns): 0.15
-6-
Zone 183
Baillaud 2627
Rating: 5 E
Position: 0508+0431
A
B
Magnitude
10.78
12.65
Separation PA
—
—
16.3 162 -
Year
—
1991
Spectra
Colors
Y
W
Notes:
1910: 18.7 @ 164. 2 measurements.
Observations:
C8 at 104x. It is overpowered by two 8m stars to the West (SAO 112438, 8m; and
SAO 112437, 8.9m).
Distance (LY): 48
Total luminosity (Suns): 0.04
Moderate
A. G. 89
Rating: 4 M
ADS 3688; HD 32866
Position: 0506+0257
A
B
Magnitude
9.18
10.19
Separation PA
—
—
2.1 +
359 +
Year
—
1997
Notes:
1903: 1.9 @ 357. 19 measurements.
Observations:
C8 at 280x. Not easy! Duplicity was noted at 104x.
Scale Model (in which the Sun is a baseball):
Diameter: A = 8.40 inches.
Separation: AB = 1.25 miles.
Distance (LY): 381
Total luminosity (Suns): 2
-7-
Spectra
F8 IV
Colors
W
W
Zone 183
STF 678
Rating: 4 M
ADS 3873; HD 34456; SAO 112602
Position: 0518+0441
A
B
C
Magnitude
8.47
8.82
12.62
Separation
—
3.5 +
77.6 +
PA
—
103 +
339 =
Year
—
1997
1991
Notes:
AB 1830: 3.3 @ 97. 25 measurements.
AC 1893: 75.3 @ 339. 4 measurements.
Observations:
C8 at 206x.
Scale Model (in which the Sun is a baseball):
Diameter: A = 11.9 inches.
Separation: AB = 9.29 miles; AC = 206 miles.
Distance (LY): 1,700
Total luminosity (Suns): 162
-8-
Spectra
F0 III?
Colors
W
pO
?
Zone 183
Zone 183, Map 2
Double Stars
Easy
STF 630
A 2630; ADS 3623; HD 32273; SAO 112340
Rating: 3 E
Position: 0502+0137
A
B
C
D
BC
Magnitude
6.45
7.97
10.70
9.50
Separation PA
—
—
14.4 +
50 +
130.3
0.4 -
99
16 -
Year
—
1991
Spectra
B8 V
A1 IV
1909
1964
Colors
Y
B
No
W
Notes:
AB 1832: 14.0 @ 49. 32 measurements. The stars share common proper motion.
BC 1913 (Aitken): 0.5 @ 25. 4 measurements.
AD 1 measurement.
Observations:
C8 at 104x. Webb saw them as W and bW. A bW 8m star is 10 min away in PA 45.
Scale Model (in which the Sun is a baseball):
Diameter: A = 1.15 inches; B = 5.64 inches.
Separation: AB = 11.5 miles; AD = 104 miles; BC = 1,686 feet.
Distance (LY): 510
Total luminosity (Suns): 63
-9-
Zone 183
Difficult
STF 652
Rating: 4 D
ADS 3764; HD 33646; SAO 112509
Position: 0512+0102
A
B
Magnitude
6.29
7.51
Separation PA
—
—
1.7 =
181 -
Year
—
1999
Spectra
F5 III
Colors
Y
Y
Notes:
1830: 1.7 @ 184. 57 measurements.
Observations:
C8 at 280x. It is a challenging double. Moderate field.
Scale Model (in which the Sun is a baseball):
Diameter: A = 10.2 inches.
Separation: AB = 2.44 miles.
Distance (LY): 920
Total luminosity (Suns): 350
Deep Sky Objects
Difficult
NGC 1762
Other Names: H III 453; UGC 3238
Astronomical League Program: Herschel II Club
Rating: 4 D
Position: 0504+0134
Type: Gal
Surface brightness: 13.0
Class: SA(rs)c:
Dimensions: 1.6' x 1.0'
Notes:
This galaxy produced supernova 2002CY.
- 10 -
Magnitude: 12.6
PA: 175
Zone 183
Observations:
C11 at 98x. Very faint and without a
nucleus. A 13m star is 3 min N. (OkieTex Star Party, 2003)
Radial velocity (km/sec): +4,753
NGC 1762
Galaxy (SA:(rs:)bc II)
Observed with C11 on 9/25/03
Magnification: 98x
Okie-Tex Star Party
Zone 183, Map 3
Double Stars
Easy
STF 639
Rating: 3 E
ADS 3654
Position: 0504-0251
A
B
Magnitude
8.16
8.87
Separation PA
—
—
5.6 +
80 +
- 11 -
Year
—
1991
Spectra
F0
Colors
W
yW
Zone 183
Notes:
1832: 5.2 @ 77. 19 measurements.
Observations:
C11 at 115x.
Scale Model (in which the Sun is a baseball):
Diameter: A = 10.5 inches.
Separation: AB = 4.45 miles.
Distance (LY): 510
Total luminosity (Suns): 17
66 Eri
STF 642 rej; ADS 3698; HD 32964; SAO 131777
Rating: 3 E
Position: 0507-0439
A
B
Magnitude
5.12
8.40
Separation PA
—
—
53.1 +
10 +
Year
—
1976
Spectra
Colors
B9 V+A1 V W
B
R
Notes:
1879: 52.5 @ 9. 7 measurements. Star A is a spectroscopic binary with a period of
5.5227 days. The stars are nearly equal in size, but the companion is the more massive of
the two and is known to be rich in mercury.
Observations:
C8 at 104x. Moderate field.
Scale Model (in which the Sun is a baseball):
Diameter: A = 9.6 inches; B less than 1 inch.
Separation: AB = 23.2 miles.
Distance (LY): 280
Total luminosity (Suns): 54.4
- 12 -
Zone 183
Jonckheere 307
Rating: 4 E
ADS 3650; HD 32526; SAO 131731
Position: 0504-0231
A
B
Magnitude
6.73
9.16
Separation PA
—
—
53.1 +
320 -
Year
—
1991
Spectra
K0 III
K0
Colors
yW
R
Notes:
1891: 52.2 @ 323. 10 measurements. Single 1951,1953,1957.
The stars show similar proper motions.
Observations:
C8 at 104x. Moderate field.
Scale Model (in which the Sun is a baseball):
Diameter: A = 10.0 feet; B = 3.30 feet.
Separation: AB = 64.6 miles.
Distance (LY): 780
Total luminosity (Suns): 110
Bur 1006
Rating: 4 E
ADS 3775
Position: 0512-0211
A
B
C
Magnitude
9.19
11.40
10.01
Separation
—
0.4 51.9 -
PA
—
240 +
178 =
Year
—
1958
1982
Notes:
AB 1881: 0.9 @ 200. 8 measurements.
AC 1881: 52.3 @ 178. 7 measurements.
Observations:
C8 at 104x; Dwarfed by two 7m stars to the S and SW.
- 13 -
Spectra
F5 V
Colors
W
No
bW
Zone 183
Scale Model (in which the Sun is a baseball):
Diameter: 4.35 inches.
Separation: AB = 356 feet; AC = 8.75 miles.
Distance (LY): 108
Total luminosity (Suns): 0.33
Barton 534
Rating: 5 E
HD 33832
Position: 0513-0347
A
B
Magnitude
9.74
10.05
Separation PA
—
—
4.0 180 +
Year
—
1995
Spectra
A1 V
Colors
W
W
Notes:
1982: 4.1 @ 171. 2 measurements.
Observations:
C11 at 115x.
Scale Model (in which the Sun is a baseball):
Diameter: A = 8.70 inches.
Separation: AB = 4,120 feet.
Distance (LY): 125
Total luminosity (Suns): 0.272
Moderate
h2257
Rating: 5 M
HD 33918; SAO 131884
Position: 0513-0439
A
B
Magnitude
6.96
11.70
Separation PA
—
—
33.3 270 +
Notes:
1893: 35.1 @ 267. 3 measurements.
- 14 -
Year
—
1983
Spectra
A0 IV
Colors
W
?
Zone 183
Observations:
C8 at 104x. Moderate field.
Scale Model (in which the Sun is a baseball):
Diameter: 12.9 inches.
Separation: AB = 29.6 miles.
Distance (LY): 570
Total luminosity (Suns): 20.53
Difficult
A 53
Rating: 5 D
ADS 3900; HD 34673; SAO 131977
Position: 0519-0305
A
B
C
Magnitude
7.77
11.23
11.37
Separation
—
3.1 196.7
PA
—
354 -!
182
Year
—
1991
1906
Notes:
AB 1900: 4.9 @ 46. 21 measurements.
AC 1 measurement.
Observations:
C8 at 104x. I had to use averted vision.
Scale Model (in which the Sun is a baseball):
Diameter: A = 13.7 inches.
Separation: AB = 1,405 feet; AC = 16.9 miles.
Distance (LY): 55
Total luminosity (Suns): 0.11
- 15 -
Spectra
K3 V
Colors
W
No
W?
Zone 183
Deep Sky Objects
Difficult
NGC 1788
Other Names: H V 32
Astronomical League Program: Herschel 400 Club
Rating: 5 D
Position: 0507-0321
Type: Gn
Class: R
Dimensions: 8' x 5'
Notes:
It was discovered by William Herschel in 1786.
Observations:
C8 at 65x. Very faint, with two stars in the line of sight. Both of these stars require
averted vision to see (one seems to lie right on the center). The whole nebula is oriented
in a NW-SE direction and is sharply cut off on the SW by the dark nebula LDN 1616.
- 16 -
Zone 183
Zone 183, Map 4
Double Stars
Easy
23 Ori
STF 696; ADS 3962; HD 35149; SAO 112697
Position: 0523+0332
A
B
Magnitude
4.99
7.17
Separation PA
—
—
32.5 +
29 +
Rating: 2 E
Year
—
1995
Spectra
B1 V
B5 V
Colors
Y
V!
Notes:
1821: 31.7 @ 28. 46 measurements. The stars have a small difference in proper
motion.
This pair is a member of the Ori OB1 Association.
Observations:
C8 at 83x. Nice pair! Some observers see both as W, or (pY and B), or (Y, bG), or
(W, pB), or (Y, B), or (Y!, gW), or (W, Grey-blue). Webb saw them as g@ and W or
yW and B!, and wrote "beautiful colors."
Scale Model (in which the Sun is a baseball):
Diameter: A = 13.8 inches; B = 11.4 inches.
Separation: AB = 48.7 miles.
Distance (LY): 960
Total luminosity (Suns): 850
STF 721
Bur 557 (BC); ADS 4088; HD 36133; SAO 112824
Position: 0530+0309
A
B
C
BC
Magnitude
6.94
8.40
9.70
Separation PA
—
—
24.9 +
149 =
0.2 -
160 +
- 17 -
Rating: 3 E
Year
—
1985
1997
Spectra
B3 V
F8 III
Colors
W
G?
No
Zone 183
Notes:
AB 1783: 24.6 @ 149. 29 measurements. Slightly different proper motions.
BC 1878: 0.5 @ 142. 17 measurements.
Observations:
C8 at 104x. The color of B is elusive. Webb saw them as W and ?. Franks thought
the companion was B or V.
Sh 61
Rating: 3 E
HD 36429; SAO 112873
Position: 0532+0250
A
B
Magnitude
7.53
8.91
Separation PA
—
—
66.9 353 =
Year
—
1991
Spectra
B5 V
F5 IV
Colors
W
Y
Notes:
1822: 67.2 @ 353. 12 measurements. The stars share a small common proper
motion.
Observations:
C8 at 104x. Moderate field.
Scale Model (in which the Sun is a baseball):
Diameter: A = 1.24 inches; B = 12.0 inches.
Separation: AB = 95.0 miles.
Distance (LY): 910
Total luminosity (Suns): 78
STF 702
Rating: 4 E
ADS 3995; HD 35350; SAO 112720; Herschel H I 75
Position: 0524+0222
A
B
Magnitude
9.57
10.14
Separation PA
—
—
8.5 +
80 +
- 18 -
Year
—
1991
Spectra
A0
Colors
W
W
Zone 183
Notes:
1831: 8.0 @ 79. 15 measurements.
May be optical because Hipparcos gives
different distances (2,170 and 138 light
years).
Observations:
C11 at 115x. Overwhelmed by a
7.5m star and a rich field.
STF 702
Observed with C11
on 11/28/03; s6, t6
Magnification: 98x
A. G. 96
Rating: 4 E
ADS 4145; HD 288012
Position: 0533+0228
A
B
Magnitude
9.61
11.05
Separation PA
—
—
4.5 237 +
Year
—
1933
Notes:
1903: 4.9 @ 234. 9 measurements.
Observations:
C11 at 115x.
Scale Model (in which the Sun is a baseball):
Diameter: A = 6.71 inches.
Separation: AB = 7.65 miles.
Distance (LY): 1,090
Total luminosity (Suns): 17
- 19 -
Spectra
A0
Colors
W
bW
Zone 183
STF 756 rej
Rating: 4 E
HD 37293; SAO 112971
Position: 0538+0219
A
B
C
Magnitude
8.65
10.36
11.30
Separation
—
23.7 =
56.5
PA
—
237 +
15
Year
—
1991
1917
Spectra
A0 V?
F0 V?
Colors
W
W
No
Notes:
AB 1904: 23.7 @ 236. 10 measurements. The stars share common proper motion.
AC 1 measurement.
Observations:
C8 at 104x.
Scale Model (in which the Sun is a baseball):
Diameter: A = 5.88 inches; B = 13.1 inches.
Separation: AB = 25.6 miles; AC = 70.5 miles.
Distance (LY): 800
Total luminosity (Suns): 23
Baillaud 1667
Rating: 5 E
HD 287809
Position: 0526+0250
A
B
Magnitude
10.39
11.60
Separation PA
—
—
7.9 +
310 +
Year
—
1991
Notes:
1910: 6.9 @ 298. 2 measurements.
Observations:
C11 at 115x. Very rich field.
Distance (LY): 79
Total luminosity (Suns): 0.057
- 20 -
Spectra
Colors
W
O
Zone 183
Baillaud 2149
Rating: 5 E
HD 244219; SAO 112820
Position: 0529+0334
A
B
Magnitude
10.38
11.76
Separation PA
—
—
19.2
169
Year
—
1910
Spectra
Colors
W
?
Notes:
1 measurement.
Observations:
C8 at 104x. It is overwhelmed by a nice asterism 5 min W.
Distance (LY): 55
Total luminosity (Suns): 0.06
STF 712
Kamper 2 (C); ADS 4033; HD 35673; SAO 112765
Rating: 3 M
Position: 0526+0256
A
B
C
Magnitude
6.52
8.47
Separation
—
3.2 +
131.8
PA
—
64 +
72
Year
—
1991
1949
Notes:
AB 1831: 3.1 @ 45. 52 measurements.
AC 1 measurement.
Observations:
C8 at 206x. Some amateurs report (W, W) or (W, W).
Scale Model (in which the Sun is a baseball):
Diameter: A = 1.16 inches.
Separation: AB = 2.55 miles; AC = 105 miles.
Distance (LY): 510
Total luminosity (Suns): 53
- 21 -
Spectra
B9 V
Colors
W
B
No
Zone 183
Difficult
Psi 2 Ori
30 Ori; Knott 3; ADS 4039; HD 35715; SAO 112775
Rating: 4 D
Position: 0527+0305
A
B
C
Magnitude
4.59
8.67
13.88
Separation
—
2.9 +
83.4
PA
—
327 +
196
Year
—
1991
1912
Spectra
B2 IV
Colors
W
V
No
Notes:
AB 1863: 2.8 @ 322. 16 measurements. Star A is a spectroscopic binary with a
2.5260 day period; it also rotates rapidly (141 km/sec). It is also a Beta CMa variable.
The orbital period is on the order of 6,300 years.
AC 1 measurement.
This system is part of the Orion OB1 Association.
Observations:
C8 at 280x. I found a diffraction mask helpful. Some observers report both as Y,
whereas Webb saw Y and B!
Scale Model (in which the Sun is a baseball):
Diameter: A = 1.00 inch.
Separation: AB = 6.43 miles; AC = 185 miles.
Distance (LY): 1,420
Total luminosity (Suns): 2,313
33 Ori
STF 729; ADS 4123; HD 36351; SAO 112861
Rating: 4 D
Position: 0531+0318
A
B
C
Magnitude
5.79
7.10
13.40
Separation
—
1.9 =
94.9 -
PA
—
28 +
52 =
- 22 -
Year
—
1999
1923
Spectra
B1 V
Colors
W
W
No
Zone 183
Notes:
AB 1831: 1.9 @ 26. 93 measurements. The stars share a small common proper
motion.
AC 1912: 95.7 @ 52. 2 measurements.
The star is a member of the Ori OB1 Association.
Observations:
C8 at 280x. A diffraction mask is a big help on this pair! Some observers report pB
and B.
Scale Model (in which the Sun is a baseball):
Diameter: A = 13.8 inches.
Separation: AB = 4.70 miles; AC = 233 miles.
Distance (LY): 1,570
Total luminosity (Suns): 1,180
Zone 183, Map 5
Double Stars
Easy
Delta Ori
Rating: 1 E
34 Ori; SI 14; Bur 558; Mintaka, "the belt"; ADS 4134; HD 36486; SAO 132220
Astronomical League Program: Double Star Club
Position: 0532-0017
A
B
C
a
Magnitude
2.30
14.00
6.84
3.60
Separation
—
33.1 53.2 +
0.3 +
PA
—
227 =
0=
140 -
Year
—
1922
1995
1999
Spectra
O9 II
B2 V
O9 V
Colors
W
No
V
No
Notes:
AB 1877: 33.8 @ 227. 5 measurements. Star A is an eclipsing binary with a 5.7324
day period. (The stars are at most only 5 million miles apart.) The AB pair is estimated
to be 27,000 AU apart (almost half a light year). The primary is also an infra-red source.
- 23 -
Zone 183
AC 1822: 52.5 @ 0. 31 measurements. Spectroscopic binary.
Aa 1978: 0.2 @ 147. 32 measurements.
In 1904, at Potsdam Observatory, stationary spectral lines of calcium were detected,
thus proving the existence of interstellar matter. There is also evidence of mass ejection
at 1,800 km/sec.
From James Kaler's Star Notes:
The star is wonderfully complex. A small telescope shows a seventh magnitude
companion separated by almost a minute of arc. The faint companion orbits at least a
quarter of a light year from the bright one. In between is a vastly dimmer 14th magnitude
component. The bright star we call Mintaka is also double, and consists of a hot (30,000
Kelvin) class B, slightly evolved, giant star and a somewhat hotter class O star, each
radiating about 70,000 times the solar luminosity, each having masses somewhat over 20
times the solar mass. This pair is too close to be separated directly. The duplicity is
known through the star's spectrum (its rainbow of light), which detects two stars orbiting
each other every 5.73 days, and also because the stars slightly eclipse each other, causing
a dip of about 0.2 magnitudes.
Mintaka is most famed. however, as a background against which the thin gas of
interstellar space was first detected, when the German astronomer Johannes Hartmann in
1904 discovered absorptions in the star's spectrum that could not be produced by the
orbiting pair. From this discovery, and others that followed, we now know that all of the
Galaxy's interstellar space contains an
enormously complex medium of gas and
dust that is the birthplace of new stars.
Mintaka will also, to some distant
generation of astronomers, be famed in
death, as each of its components is so
massive that their only fate is to explode
violently as supernovae.
Delta Ori (Bur 558)
Observed with C11
on 11/29/03; s4, t4
Magnification: 98x
Observations:
C8 at 65x. A nice pair! Some observers
report colors of W and B, yW and R, W and
W, bW and B, Y and pG, B and B. Webb
said he saw them as gW and W, but lists a
vast range of colors by earlier observers,
including pG and V, pY and B!, and yW and
pL.
Scale Model (in which the Sun is a baseball):
Diameter: A = 24.0 inches; C = 13.2 inches.
Separation: AB = 47.5 miles; AC = 76.4 miles; Aa = 2,274 feet.
- 24 -
Zone 183
Distance (LY): 920
Total luminosity (Suns): 8,414
STF 700
Rating: 2 E
ADS 3968; HD 35192; SAO 112704
Position: 0523+0103
A
B
Magnitude
7.08
7.31
Separation PA
—
—
4.8 +
5=
Year
—
1992
Spectra
B9 V
Colors
W
W
Notes:
1831: 4.5 @ 5. 29 measurements. The stars have different proper motions.
Observations:
C8 at 104x. Franks saw them as yW and bW. Very rich field.
Scale Model (in which the Sun is a baseball):
Diameter: A = 1.21 inches.
Separation: AB = 5.62 miles.
Distance (LY): 750
Total luminosity (Suns): 91
Winnecke 2
A 847 (BC); ADS 3991; SAO 132060
Rating: 2 E
Position: 0524-0052
A
B
Magnitude
6.87
6.96
Separation PA
—
—
3.0 +
159 -
Year
—
1998
Spectra
F2 V
F8 V
Colors
W
Y
Notes:
1863: 1.6 @ 174. 87 measurements. The A star is a spectroscopic binary.
Aitken found a companion to B in 1904, 8.1m at 0.2 @ 142.
Observations:
C8 at 280x. A diffraction mask is a big help here. A fine pair at the apex of a cross
that points E. At the foot of the cross is 5.1m yO 27 Ori (5.1m, yO, 70 times as bright as
the Sun, 310 light years away). Moderate field.
- 25 -
Zone 183
Scale Model (in which the Sun is a baseball):
Diameter: A = 10.7 inches; B = 10.8 inches.
Separation: AB = 4,646 feet.
Distance (LY): 189
Total luminosity (Suns): 12.3
25 Ori
V1086 Ori; South 479; HD 35439; SAO 112734
Rating: 2 E
Position: 0525+0151
A
B
C
Magnitude
8.10
8.30
4.70
Separation
—
46
158
PA
—
220
35
Year
—
1919
Spectra
AVep
A0
Colors
W
W
bW
Notes:
This star is spinning so fast (316 km/sec at the equator) that it has thrown off a shell
of material.
It is a member of the Orion OB1 Association.
Observations:
C8 at 104x. It is odd that star C is brighter than either A or B. Rich field.
Distance (LY): 1,110
Total luminosity (Suns): 1,447
OSS 65
Rating: 2 E
HD 37330; SAO 112980
Position: 0538+0058
A
B
Magnitude
7.47
8.02
Separation PA
—
—
79.6 31 =
Year
—
1995
Spectra
B6 V
B5 V
Colors
W
W
Notes:
1875: 80.1 @ 31. 19 measurements.
The orbital period is 62.28 years, although the Hipparcos data suggests an optical
pairing (1,600 and 1,060 light years). The stars share a small common proper motion.
- 26 -
Zone 183
Observations:
C8 at 104x.
H V 118
Rating: 3 E
ADS 4159; HD 36779; SAO 132269
Position: 0534-0102
A
B
Magnitude
6.22
11.20
Separation PA
—
—
28.0 +
265 +
Year
—
1977
Spectra
B3 V
Colors
W
B
Notes:
1901: 27.5 @ 264. 2 measurements.
This star is a member of the Ori OB1 Association.
Observations:
C8 at 104x.
Scale Model (in which the Sun is a baseball):
Diameter: A = 12.6 inches.
Separation: AB = 54.0 miles.
Distance (LY): 1,240
Total luminosity (Suns): 415
STF 751
Rating: 3 E
ADS 4195; HD 37076; SAO 132337
Position: 0536-0059
A
B
Magnitude
8.02
8.96
Separation PA
—
—
15.6 =
123 -
Year
—
1991
Spectra
B9 V
Colors
W
L?
Notes:
1831: 15.6 @ 124. 14 measurements. The stars show a similar, but small, proper
motion.
Observations:
C8 at 104x. Webb saw them as W and B. Very rich field.
- 27 -
Zone 183
Scale Model (in which the Sun is a baseball):
Diameter: A = 1.28 inches.
Separation: AB = 12.2 miles.
Distance (LY): 500
Total luminosity (Suns): 15
Webb 3
Rating: 4 E
HD 35191; SAO 112705
Position: 0523+0117
A
B
Magnitude
7.29
10.45
Separation PA
—
—
62.5 +
10 -
Year
—
1991
Spectra
K2 IV?
Colors
Y
O
Notes:
1909: 62.2 @ 11. 8 measurements. Hipparcos/Tycho data show different distances
for these stars; they may be optical. The stars have different proper motions.
Observations:
C8 at 104x. Very rich field.
Scale Model (in which the Sun is a baseball):
Diameter: A = 34.0 inches.
Separation: AB = 28.2 miles.
Distance (LY): 289
Total luminosity (Suns): 10.0
Baillaud 670
Rating: 4 E
HD 290440
Position: 0528-0038
A
B
Magnitude
9.18
10.47
Separation PA
—
—
11.4 -! 307 -
Year
—
1991
Spectra
Colors
W
rO
Notes:
1892: 15.8 @ 314. 6 measurements. The stars have different proper motions.
- 28 -
Zone 183
Observations:
C8 at 83x. Rich field.
Distance (LY): 494
Total luminosity (Suns): 14
Baillaud 1294
Sinachopoulos 16 (C); HD 36311; SAO 112856
Rating: 4 E
Position: 0531+0137
A
B
C
Magnitude
8.55
10.17
11.30
Separation
—
9.7 =
41.6 -
PA
—
51 +
328 +!!
Year
—
1991
1992
Spectra
A0
Colors
W
W
?
Notes:
AB 1909: 9.7 @ 50. 4 measurements.
AC 1989: 42.0 @ 275. 2 measurements.
Observations:
C11 at 115x. C is difficult.
Scale Model (in which the Sun is a baseball):
Diameter: A = 11.7 inches.
Separation: AB = 20.6 miles; AC = 88.3 miles.
Distance (LY): 1,360
Total luminosity (Suns): 72
STF 757
STF 758 (CD); South 493 (E); ADS 4234; HD 37370
Rating: 4 E
Position: 0538-0011
A
B
C
D
E
Magnitude
7.98
8.41
8.66
8.56
10.10
Separation
—
1.551.4 +
41.4 137.8 -
PA
—
239 87 =
79 =
264 +
- 29 -
Year
—
1995
1960
1991
1960
Spectra
B6 V
Colors
W
W
W
W
W
Zone 183
Notes:
AB 1831:
AC 1831:
motion.
AD 1842:
AE 1825:
1.7 @ 240. 26 measurements.
50.9 @ 87. 11 measurements. The stars share a small common proper
41.5 @ 79. 10 measurements.
138.4 @ 262. 3 measurements. Common proper motion.
Observations:
C8 at 104x. A neat 8.5m pair 15" apart @ pa 110 is 2 min E. At the time of my
observation, I was unaware of the existence of B, C and D as parts of this system, so did
not bother to note them.
Scale Model (in which the Sun is a baseball):
Diameter: A = 1.28 inches.
Separation: AB = 1.73 miles; AC = 59.4 miles; AD = 47.8 miles; AE = 159 miles.
Distance (LY): 740
Total luminosity (Suns): 44
Epsilon Ori
Rating: 5 E
46 Ori; Alnilam, "the string of pearls"; Bpm 81; HD 37128; SAO 132346
Position: 0536-0112
A
B
Magnitude
1.69
11.64
Separation PA
—
—
178.5 59 +
Year
—
1986
Spectra
B0 Ie
Colors
bW
W
Notes:
1879: 179.9 @ 57. 3 measurements.
The primary is a member of the Ori OB1 Association and is a spectroscopic binary.
Its diameter has been measured as 0.00067", and it is ejecting material at 1,800 kps. It is
also an infra-red source.
Observations:
C8 at 104x.
Scale Model (in which the Sun is a baseball):
Diameter: A = 45 feet?
Separation: AB = 373 miles.
Distance (LY): 1,340
Total luminosity (Suns): 30,409
- 30 -
Zone 183
Pritchett 1
Rating: 5 E
Position: 0537+0006
A
B
C
BC
Magnitude
9.39
10.25
11.00
Separation PA
—
—
28.3
137
6.6+
Year
—
1917
1916
Spectra
B9
Colors
W
?
No
41 -!
Notes:
AB 1 measurement.
BC 1881: 6.5 @ 131. 4 measurements.
Observations:
C8 at 104x
Harvard 75
Rating: 5 E
Position: 0538-0103
A
B
Magnitude
10.69
11.00
Separation PA
—
—
29.0
344
Year
—
1904
Spectra
Notes:
1 measurement.
Observations:
C11 at 115x. It helps to get Epsilon Ori out of the field of view.
- 31 -
Colors
W
W
Zone 183
Moderate
31 Ori
CI Ori; STF 725; ADS 4097; HD 36167; SAO 132176
Rating: 2 M
Position: 0530-0103
A
B
Magnitude
4.69
9.90
Separation PA
—
—
14.1 +
86 -
Year
—
1963
Spectra
K4 III
F7
Colors
dY!!
B
Notes:
1829: 12.7 @ 88. 19 measurements. Star A is a spectroscopic binary and an infrared source. The stars share similar proper motion.
Observations:
C8 at 104x. Webb saw them as D! and ?
Scale Model (in which the Sun is a baseball):
Diameter: A = 53.4 inches; B = 3.60 inches.
Separation: AB = 10.0 miles.
Distance (LY): 456
Total luminosity (Suns): 220
STF 708
Rating: 3 M
ADS 4012; HD 35501; SAO 112744
Position: 0525+0155
A
B
Magnitude
7.43
8.55
Separation PA
—
—
2.7 +
322 -
Notes:
1831: 2.6 @ 323. 18 measurements.
Observations:
C8 at 280x.
- 32 -
Year
—
1991
Spectra
B8 V
Colors
Y
O
Zone 183
Scale Model (in which the Sun is a baseball):
Diameter: A = 1.24 inches.
Separation: AB = 7.46 miles.
Distance (LY): 1,770
Total luminosity (Suns): 325
h2267
Rating: 4 M
HD 36013; SAO 112813
Position: 0529+0139
A
B
Magnitude
6.91
12.65
Separation PA
—
—
25.0
111
Year
—
1904
Spectra
B3 V
Colors
bW
?
Notes:
1 measurement.
Observations:
C8 at 104x. Very rich field.
Scale Model (in which the Sun is a baseball):
Diameter: A = 5.21 inches.
Separation: AB = 38.6 miles.
Distance (LY): 990
Total luminosity (Suns): 143
STF 741
Rating: 4 M
ADS 4180; HD 36898; SAO 132291
Position: 0535-0008
A
B
Magnitude
7.14
10.13
Separation PA
—
—
10.1 286 =
Year
—
1991
Spectra
B5
Colors
Y
B
Notes:
1831: 10.2 @ 286. 15 measurements. The stars have different proper motions.
- 33 -
Zone 183
Observations:
C8 at 104x.
Scale Model (in which the Sun is a baseball):
Diameter: A = 2.57 inches.
Separation: AB = 19.7 miles.
Distance (LY): 1,250
Total luminosity (Suns): 205
h697
Position: 0522-0025
A
B
C
Magnitude
5.68
11.30
11.88
Rating: 5 M
Separation
—
33.1 +
38.4 -
PA
—
60 =
112 +
Year
—
1901
1901
Notes:
AB 1878: 32.4 @ 60. 2 measurements.
AC 1878: 36.8 @ 110. 2 measurements.
Observations:
C8 at 206x.
Scale Model (in which the Sun is a baseball):
Diameter: A = 12.6 inches.
Separation: AB = 55.8 miles.
Distance (LY): 1,080
Total luminosity (Suns): 486
- 34 -
Spectra
B3 V
Colors
bW
?
?
Zone 183
Difficult
STF 734
Rating: 4 D
ADS 4150; HD 36646; SAO 132247; Herschel H V 119 (AC)
Position: 0533-0143
A
B
C
D
CD
Magnitude
6.75
8.27
9.49
9.33
Separation
—
1.7 29.4 +
PA
—
350 244 +
Year
—
1994
1991
0.7 -
296 =
1991
Spectra
B4 Vn
B8
B8
Notes:
AB 1832: 1.8 @ 356. 33 measurements. Common proper motion.
AC 1832: 29.3 @ 243. 25 measurements. Different proper motion.
CD 1888: 0.8 @ 296. 19 measurements.
This star is a member of the Ori OB1 Association and rotates at 196 kps.
Observations:
C8 at 280x. The components seem faint for the given magnitudes.
Scale Model (in which the Sun is a baseball):
Diameter: A = 1.18 inches; B = 1.30 inches; C = 1.40 inches.
Separation: AB = 7.32 miles; AC = 127 miles; CD = 3.01 miles.
Distance (LY): 2,760
Total luminosity (Suns): 2,040
- 35 -
Colors
O
?
?
No
Zone 183
Deep Sky Objects
Easy
Collinder 70
Position: 0536-0100
Type: Oc
Rating: 3 E
Magnitude: 4.0
Dimensions: 150
Notes:
This cluster is only 5 million years old.
Observations:
C8 at 10x. (Spotter). Best in the spotter. It is rectangular in shape (running NW to
SE) with four very bright stars and 8 to 10 fainter ones.
Difficult
NGC 1990
Other Names: LBN 940, H V 34
Astronomical League Program: Herschel II Club
Rating: 5 D
Position: 0536-0112
Type: Gn
Class: Emm/Refl
Observations:
C11 at 115x with occulting bar. It is a very, very faint glow surrounding Epsilon Ori,
and is brightest NE of the star.
- 36 -
Zone 183
Zone 183, Map 6
Double Stars
Easy
Sigma Ori
Rating: 1 E
48 Ori; Bu 1032 (B); STF 762; ADS 4241; HD 37468; SAO 132406
Astronomical League Program: Double Star Club
Position: 0539-0236
A
B
C
D
E
Magnitude
3.77
4.98
8.79
6.66
6.34
Separation
—
0.2 =
11.4 13.0 +
41.7 +
Sigma Ori (STF 762)
Observed with C11
on 11/29/03; s4, t4
Magnification: 98x
PA
—
287 238 +
84 +
62 +
Year
—
1999
1973
1991
1994
Spectra
O9 V
B3pHe
B2 V
Colors
bW
No
W
B
W
Notes:
AB 1888: 0.2 @ 358. 96
measurements. Orbit computed; 155.3 year
period, semi-major axis of 0.264", motion
retrograde. The A star is 35 solar masses
(the most massive of visual binaries).
AC 1831: 11.6 @ 235. 28
measurements.
AD 1831: 12.9 @ 83. 45
measurements. The D star is rich in
helium.
AE 1831: 41.4 @ 61. 41 measurements.
The distance between A and E is at least
20,000 AU (1/3 light year). The E star may
be a captured star.
The whole group is part of the Ori OB1
Association.
Hipparcos/Tycho data show different
distances for these stars; they may be
optical.
- 37 -
Zone 183
Observations:
C8 at 104x. Beautiful!! Some observers report O, B and W. Webb saw them as W
and W or R and B.
h702
Rating: 3 E
HD 35957
Position: 0528-0156
A
B
Magnitude
7.98
9.32
Separation PA
—
—
24.1 149 =
Year
—
1991
Spectra
A
Colors
W
bW
Notes:
1893: 24.3 @ 149. 13 measurements.
The stars have a small difference in proper motion.
Secchi found a pair nearby, 8.5m and 9.0m, 5.2 @ 51.
Dembowski found another pair nearby, 8.5m and 10.0m, 15.7 @ 359.
Observations:
C8 at 104x. Webb wrote, "Beautiful combination." Bright and rich field.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 7.56 inches.
Separation: AB = 54.5 miles.
Distance (LY): 1,450
Total luminosity (Suns): 132
Dembowski 8
Rating: 3 E
ADS 4080; HD 290547; SAO 132158
Position: 0529-0200
A
B
C
D
CD
Magnitude
9.34
10.11
9.90
12.46
Separation
—
5.7 +
102.9 +
16.7 +
PA
—
46 293 +?
Year
—
1991
1981
354 -
1969
- 38 -
Spectra
F5
Colors
B
R
W
?
Zone 183
Notes:
AB 1857: 5.3 @ 51. 11 measurements.
AC 1875: 102.5 @ 111. 10 measurements. The stars show similar proper motions.
Quadrant reversal?
CD 1875: 15.8 @ 359. 4 measurements.
Observations:
C8 at 104x. Moderate field.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 14.1 inches.
Separation: AB = 1.49 miles; AC = 27.0 miles; CD = 4.38 miles.
Distance (LY): 168
Total luminosity (Suns): 1.8
STF 761
Rating: 3 E
ADS 4240; HD 294271; SAO 132401
Position: 0539-0233
A
B
C
D
Magnitude
7.91
8.60
8.60
8.00
Separation
—
67.9 73.6 +
33.8 +
PA
—
201 210 +
310 +
Year
—
1931
1915
1932
Spectra
B5 V
Colors
W
V
W
W
Notes:
AB 1830: 68.1 @ 202. 14 measurements. The stars have different proper motions.
AC 1891: 73.4 @ 208. 6 measurements.
AD 1916: 33. @ 309. 2 measurements.
Observations:
C8 at 104x. Webb saw both as W. Very rich field.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 1.27 inches.
Separation: AB = 15.1 miles; AC = 16.3 miles; AD = 7.49 miles.
Distance (LY): 142
Total luminosity (Suns): 2.1
- 39 -
Zone 183
H IV 68
Rating: 4 E
HD 35502; SAO 132081
Position: 0525-0249
A
B
Magnitude
7.34
9.09
Separation PA
—
—
135.8 282 +
Year
—
1991
Spectra
B8 V
Colors
bW
O
Notes:
1900: 136.4 @ 281. 4 measurements.
Hipparcos/Tycho mission data show different distances for these stars (1,330 and 670
light years); they may be AB optical.
Observations:
C8 at 104x.
STF 731
Rating: 4 E
ADS 4127; HD 36394; SAO 132208
Position: 0531-0206
A
B
C
D
Magnitude
8.08
8.71
Separation
—
4.6 =
163.8
11.2
PA
—
328 -?
135
85
Year
—
1997
1904
1992
Spectra
A0 III?
Colors
W
O
No
No
Notes:
AB 1831: 4.6 @ 152. 21 measurements. Quadrant reversal?
AC and AD, 1 measurement.
The area just to the S is known as "Orion's Cloak", a diffuse nebula that surrounds a
young and hot OB1 association centered at 0531-0241.
Observations:
C8 at 104x. Webb wrote, "beautiful pair." Rich field.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 5.68 inches.
Separation: AB = 16.2 miles; AC = 575 miles; AD = 39.3 miles.
Distance (LY): 2,250
Total luminosity (Suns): 300
- 40 -
Zone 183
h2270
Rating: 4 E
HD 36342; SAO 132200
Position: 0531-0416
A
B
Magnitude
7.54
11.08
Separation PA
—
—
28.0 +
341 +
Year
—
1990
Spectra
A2 IV
Colors
W
B
Notes:
1896: 26.8 @ 337. 5 measurements.
Observations:
C8 at 83x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 13.0 inches.
Separation: AB = 32.8 miles.
Distance (LY): 750
Total luminosity (Suns): 42
STF 746 rej
Rating: 4 E
Position: 0535-0441
A
B
Magnitude
9.72
10.70
Separation PA
—
—
13.8 217 -
Year
—
1989
Spectra
A0
Notes:
1893: 14.3 @ 221. 6 measurements.
Observations:
C11 at 115x. It is overpowered by the very bright and rich field.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 6.75 inches.
Separation: AB = 5.44 miles.
Distance (LY): 253
Total luminosity (Suns): 0.910
- 41 -
Colors
W
W
Zone 183
Moderate
Webb 4
S Ori; HD 36090; SAO 132163
Rating: 2 M
Position: 0529-0442
A
B
Magnitude
10.23
11.16
Separation PA
—
—
47.7 +
52 +?
Year
—
1991
Spectra
M6.5ev
Colors
dR!!
W
Notes:
1879: 46.7 @ 227. 11 measurements. Hipparcos/Tycho data show different
distances for these stars; they may be optical. The stars have different proper motions.
The primary is a Mira-type variable. Quadrant reversal?
Observations:
C8 at 104x. The hue in A is very deep!
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 68.7 inches.
Separation: AB = 744 miles.
Distance (LY): 10,000
Total luminosity (Suns): 1,000
STF 750
Rating: 4 M
ADS 4192; HD 37040; SAO 132325
Position: 0535-0422
A
B
Magnitude
6.56
8.52
Separation PA
—
—
4.3 =
60 +
Year
—
1991
Spectra
B2 IV
Colors
W
B
Notes:
1831: 4.3 @ 59. 25 measurements. The star is a member of the Ori OB1 Association
and rotates at 140 kps.
Observations:
C8 at 206x. The background is open cluster NGC 1981— a very rich view! This pair
lies in the NE quadrant. Webb saw them as both W.
- 42 -
Zone 183
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 1.16 inches.
Separation: AB = 8.39 miles.
Distance (LY): 1,250
Total luminosity (Suns): 349
STF 693
Rating: 5 M
ADS 3944; HD 35019; SAO 132026
Position: 0522-0203
A
B
Magnitude
8.49
8.92
Separation PA
—
—
3.5 11 +
Year
—
1998
Spectra
A7 V
Colors
W
W
Notes:
1831: 3.7 @ 9. 23 measurements.
Observations:
C8 at 206x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 5.82 inches.
Separation: AB = 3.55 miles.
Distance (LY): 650
Total luminosity (Suns): 20
Engelmann 20
Rating: 5 M
HD 36395
Position: 0532-0341
A
B
Magnitude
7.92
10.40
Separation PA
—
—
231.6 +!! 312 +!!
Year
—
1985
Spectra
M1.5 V
Colors
rO
?
Notes:
1892: 108.7 @ 250. 5 measurements. Optical pair.
A is a very high proper motion star: +763.0 mas / yr RA and -2,092.9 mas / yr Dec.
- 43 -
Zone 183
Observations:
C11 at 115x.
Difficult
Eta Ori
Rating: 1 D
28 Ori; Saif, "the sword of the giant"; AC = H VI 67; Dawes 5; ADS 4002; HD 35411;
SAO 132071
Position: 0524-0224
A
B
C
Magnitude
3.35
4.91
9.40
Separation
—
1.7 +
116.8 +
PA
—
80 53 +
Year
—
1998
1977
Spectra
B0 IV
Colors
W!
B!
W?
Notes:
This double was discovered by Dawes in 1848 with a 4.5" scope.
AB 1848: 0.9 @ 87. Over 100 measurements.
AC 1904: 115.1 @ 51. 3 measurements.
The orbit takes 9.2 years. The AB stars are about 400 AU apart.
Star A is an eclipsing spectroscopic binary with a 7.9841-day period. It is also
surrounded by an expanding shell.
The entire system tips the scales at over 50 solar masses, the largest star being 17
solar masses.
Observations:
C8 at 206x. Webb saw them as W and V.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 17.7 inches.
Separation: AB = 2.39 miles; AC = 164 miles.
Distance (LY): 900
Total luminosity (Suns): 2,751
- 44 -
Zone 183
42 Ori
Dawes 4; HD 37018; SAO 132320
Rating: 4 D
Position: 0535-0450
A
B
Magnitude
4.58
7.90
Separation PA
—
—
1.1 208 -
Year
—
1994
Spectra
B1 V
Colors
bW
W
Notes:
1848: 2 @ 220. 17 measurements.
Observations:
C8 at 516x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 13.8 inches.
Separation: AB = 1.36 miles.
Distance (LY): 790
Total luminosity (Suns): 74,000
STF 743
Secchi 4; ADS 4176; HD 36883; SAO 132285
Rating: 5 D
Position: 0535-0424
A
B
C
D
Magnitude
7.74
8.25
8.50
Separation
—
1.8 =
51.5
10.9
PA
—
283 +
86
297
Year
—
1999
1859
1859
Spectra
B8 V
Colors
W
W
No
No
Notes:
AB 1830: 1.8 @ 278. 36 measurements.
AC and AD, 1 measurement.
Observations:
C8 at 280x. It lies at the tip of Orion's sword, in the west half of the open cluster
NGC 1981. Very bright field.
- 45 -
Zone 183
Note three 6m stars in a N-S line about 8 min east. All are members of the Orion
OB1 Association. The N and S stars are both spectroscopic binaries (65.43233 day
period for the N star, 18.65 days for the S one).
Deep Sky Objects
Easy
NGC 1973
Position: 0535-0444
Type: Gn
Cluster population: 20
Rating: 3 E
Class: E+R
Dimensions: 5'
Observations:
C8 at 104x. The greenish color of this nebula is very pronounced, and the nebula is
quite bright, being lit by KX Ori. At high powers, some of the stars that light it begin to
peep through. It has a footprint shape.
NGC 1981
Rating: 4 E
Other Names: Collinder 73
Astronomical League Program: Urban Deep Sky Club, Binocular Deep Sky Club
Position: 0535-0426
Type: Oc
Dimensions: 25'
Class: III 3pn
Cluster population: 50
Magnitude: 8.0
Notes:
The youngest stars are B1 types, but the cluster is 32 million years old. The brightest
star is 6.3m.
This cluster lies 29,000 light years from the galactic center and 425 light years below
the galactic plane.
Observations:
C8 at 83x. It is sparse, but bright. It looks best under low powers and is dominated
by two rows of stars. This cluster contains the doubles STF 743 and STF 750 (on the NE
side).
- 46 -
Zone 183
C11 at 98x. Large and bright. A W dominates the pattern.
Model (where the Sun is a baseball):
Its diameter would be 3,040 miles, with stars would be 400 miles apart.
Distance (LY): 1,300
Luminosity (suns): 83
Difficult
NGC 1975
Position: 0535-0441
Type: Gn
Rating: 3 D
Class: E+R
Dimensions: 10' x 5'
Observations:
C8 at 83x. The open cluster inside this nebula is very rich. The nebula itself is
extremely faint.
NGC 1977
Other Names: 42 Ori Nebula, H V 30
Astronomical League Program: Herschel II Club
Rating: 3 D
Position: 0536-0452
Type: Gn
Class: E+R
Dimensions: 40' x 25'
Observations:
C8 at 83x. The illuminating cluster is very rich, while the nebula is extremely faint,
being brightest in the S portion.
C11 at 98x. The view in the C11 was not much better than in the C8 years earlier!
Rich cluster but faint nebula, brightest in the south section.
- 47 -
Zone 183
Zone 183, Map 7
Double Stars
Easy
STF 818
Rating: 2 E
ADS 4511; HD 39832
Position: 0555+0443
A
B
Magnitude
9.84
10.06
Separation PA
—
—
6.1 +
278 +
Year
—
1991
Spectra
K0
Colors
W
W
Notes:
1830: 5.9 @ 274. 12 measurements. The stars show similar proper motions.
Observations:
C8 at 104x.
STF 789 rej
A 2655 (C); ADS 4333; HD 38309; SAO 113099
Rating: 3 E
Position: 0545+0400
A
B
C
Magnitude
6.09
10.14
12.20
Separation
—
15.6 1.1 -
PA
—
149 112 +
Notes:
AB 1905: 17.5 @ 150. 12 measurements.
BC 1913: 1.2 @ 108. 4 measurements.
Observations:
C11 at 115x.
- 48 -
Year
—
1962
1958
Spectra
g F0n
Colors
W
B
No
Zone 183
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 9.10 inches.
Separation: AB = 4.01 miles; AC = 1,478 feet.
Distance (LY): 165
Total luminosity (Suns): 8.02
STF 788
Rating: 3 E
ADS 4329; HD 38270; SAO 113093
Position: 0545+0350
A
B
C
Magnitude
7.64
10.03
10.30
Separation
—
7.5 +
35.9 -
PA
—
89 +
148 +
Year
—
1991
1987
Spectra
B9
Colors
W
O
B
Notes:
AB 1831: 7.2 @ 88. 14 measurements. The stars show similar proper motions.
AC 1831: 36.1 @ 147. 13 measurements.
Observations:
C8 at 104x. I am not at all certain about the colors. Very rich field.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 4.91 inches.
Separation: AB = 5.96 miles; AC = 28.6 miles.
Distance (LY): 510
Total luminosity (Suns): 25
STF 797
Rating: 4 E
ADS 4401; HD 38798; SAO 113161
Position: 0548+0442
A
B
Magnitude
7.29
9.97
Separation PA
—
—
7.3 +
17 +
Notes:
1832: 7.1. @ 15. 12 measurements.
- 49 -
Year
—
1991
Spectra
A0 IV?
Colors
W
R
Zone 183
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 5.40 inches.
Separation: AB = 7.86 miles.
Distance (LY): 690
Total luminosity (Suns): 53
Baillaud 2643
Rating: 5 E
HD 248340; SAO 113190
Position: 0550+0416
A
B
Magnitude
10.02
10.45
Separation PA
—
—
16.5 +
357 -
Year
—
1991
Spectra
Colors
W
W
Notes:
1900: 15.9 @ 358. 5 measurements.
The stars share common proper motion.
Observations:
C8 at 104x. This pair is faint. A 7m rO star 5 min N is a problem.
Distance (LY): 1,480
Total luminosity (Suns): 67
Baillaud 2644
Position: 0551+0429
A
B
Magnitude
9.99
11.86
Rating: 5 E
Separation PA
—
—
18.2
356
Year
—
1910
Notes:
1 measurement.
Observations:
C8 at 104x; an 8m star is 6 min NNW.
Distance (LY): 40
Total luminosity (Suns): 0.024
- 50 -
Spectra
Colors
W
?
Zone 183
Moderate
Jonckheere 36
Rating: 4 M
ADS 4395; HD 38767; SAO 113155
Position: 0548+0354
A
B
Magnitude
7.83
9.56
Separation PA
—
—
1.5 101 -
Year
—
1991
Notes:
1910: 1.7 @ 114. 16 measurements.
Observations:
C11 at 193x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 5.30 inches.
Separation: AB = 2,114 feet.
Distance (LY): 171
Total luminosity (Suns): 2.03
- 51 -
Spectra
F8 V
Colors
W
W
Zone 183
Zone 183, Map 8
Double Stars
Easy
STF 782
Rating: 3 E
HD 38050; SAO 113069
Position: 0543+0001
A
B
C
Magnitude
8.50
8.83
11.70
Separation
—
46.0 +
131.7
PA
—
306 164
Year
—
1991
1910
Spectra
K0 IV?
K2 IV?
Colors
Y
W
?
Notes:
AB 1831: 36.2 @ 309. 22 measurements. Hipparcos/Tycho data show different
distances for these stars; they may be optical. However, the stars show similar proper
motion.
AC 1 measurement.
Observations:
C8 at 83x. Moderate field.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 36.0 inches; B = 37.0 inches.
Separation: AB = 32.5 miles; AC = 93.1 miles.
Distance (LY): 453
Total luminosity (Suns): 11.33
STF 809
Bur 1188 (B); ADS 4442; HD 39169; SAO 132583
Position: 0551-0126
A
B
C
Magnitude
8.08
10.18
9.38
Separation
—
0.9 24.4 -
PA
—
95 93 -
- 52 -
Rating: 3 E
Year
—
Spectra
G5 IV?
1991
F0 V?
Colors
O
No
dB!
Zone 183
Notes:
AB 1890: 1.2 @ 106. 14 measurements.
AC 1831: 25.7 @ 101. 21 measurements.
Observations:
C8 at 104x. Webb saw them as Y and W.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 15.8 inches; C = 12.5 inches.
Separation: AB = 4,382 feet; AC = 22.5 miles.
Distance (LY): 590
Total luminosity (Suns): 25
STF 819
Rating: 3 E
HD 39834; SAO 132643
Position: 0555-0056
A
B
Magnitude
8.18
9.94
Separation PA
—
—
25.6 +
98 +
Year
—
1991
Spectra
G5 III
Colors
Y
W
Notes:
1831: 25.3 @ 97. 12 measurements. The stars share common proper motion.
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 16.0 inches.
Separation: AB = 3.64 miles.
Distance (LY): 91
Total luminosity (Suns): 0.44
- 53 -
Zone 183
Bur 1189
Rating: 5 E
ADS 4541; HD 40208; SAO 113299
Position: 0558+0022
A
B
Magnitude
7.98
8.28
Separation PA
—
—
26.4 195 =
Year
—
1991
Spectra
A
A
Colors
W
W
Notes:
1890: 58.1 @ 195. 11 measurements.
A has a 10.3m companion at only 0.2".
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 7.56 inches; B = 7.70 inches.
Separation: AB = 14.5 miles.
Distance (LY): 351
Total luminosity (Suns): 10.7
59 Ori
V1004 Ori; ADS 4555; HD 40372; SAO 113315; H V 100
Rating: 5 E
Position: 0558+0150
A
B
Magnitude
5.88
10.57
Separation PA
—
—
35.6 205 -
Year
—
1984
Spectra
A5
Colors
W
?
Notes:
1878: 36.6 @ 206. 9 measurements. Star A is a spectroscopic binary with a 2.7405
day period and is also a Delta Scuti variable. The stars have a small difference in proper
motion.
Observations:
C8 at 104x.
- 54 -
Zone 183
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 9.15 inches.
Separation: AB = 19.6 miles.
Distance (LY): 353
Total luminosity (Suns): 37
Moderate
Baillaud 312
Rating: 5 M
HD 39203
Position: 0551-0116
A
B
Magnitude
9.24
11.05
Separation PA
—
—
6.9 156 =
Year
—
1991
Spectra
A3
Colors
W
W
Notes:
1892: 7.4 @ 156. 4 measurements.
Observations:
C11 at 115x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 7.94 inches.
Separation: AB = 7.00 miles.
Distance (LY): 650
Total luminosity (Suns): 7.91
60 Ori
Kuiper 22; HD 40446; SAO 113321
Rating: 5 M
Position: 0559+0033
A
B
Magnitude
5.22
11.80
Separation PA
—
—
19.0 31 +
- 55 -
Year
—
1988
Spectra
A0 V
Colors
W
?
Zone 183
Notes:
1958: 19.1 @ 30. 2 measurements. Star A is a spectroscopic binary.
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 9.00 inches.
Separation: AB = 10.9 miles.
Distance (LY): 367
Total luminosity (Suns): 89.2
Difficult
h2283
Position: 0555+0136
A
B
Magnitude
11.19
12.64
Rating: 5 D
Separation PA
—
—
18.7
9
Year
—
1914
Spectra
Colors
W
bW?
Notes:
1 measurement.
Observations:
C8 at 104x.
STF 826
Rating: 5 D
ADS 4570; HD 40473; SAO 132709
Position: 0559-0120
A
B
Magnitude
8.84
9.68
Separation PA
—
—
1.9 +
132 +
Notes:
1832: 1.8 @ 116. 37 measurements.
- 56 -
Year
—
1995
Spectra
B9
Colors
Y
O
Zone 183
Observations:
C8 at 206x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 5.28 inches.
Separation: AB = 1.54 miles.
Distance (LY): 520
Total luminosity (Suns): 12
Deep Sky Objects
Easy
NGC 2071
Other Names: LBN 938, H IV 36
Astronomical League Program: Herschel II Club
Rating: 3 E
Position: 0547+0018
Type: GN
Class: Emm/Refl
Dimensions: 7' x 5'
Observations:
C11 at 98x. Very nice; roundish with a
star embedded. A nebula to the S is much
brighter. (Observed at the Okie-Tex Star
Party in 2003.)
From Kansas City, I rated it 5 D. What a
difference seeing and dark skies make!
NGC 2071
Reflection nebula
Observed with C11 on 9/26/03
Magnification: 98x
Okie-Tex Star Party
- 57 -
Zone 183
NGC 2068
Other Names: M78
Astronomical Leage Program: Messier Club
Rating: 4 E
Position: 0547+0003
Type: Gn
Dimensions: 8' x 6'
Class: R
Magnitude: 8.0
Notes:
It was discovered by P. Mechain early in 1780; Messier added to his list on December
17, 1780. Messier wrote of it, "cluster of stars with much nebulosity in Orion." Lord
Rosse suspected spiral structure!
It is 3 light years in diameter.
Observations:
C8 at 65x. Easy and fan-shaped. Note three stars inside. With a nebular filter, I
thought I detected hints of lanes, an observation perhaps borne out by the NGC
description of "wispy". It looks somewhat like a comet.
Model (where the Sun is a baseball):
Its diameter would be 1,200 miles.
Distance (LY): 1,600
Luminosity (suns): 120
Moderate
IC 432
Position: 0541-0129
Type: Gn
Rating: 2 M
Class: R
Dimensions: 8' x 4'
Observations:
C8 at 104x. It is very large, with indistinct edges. It looks a little lopsided to me and
envelopes 8.4m SAO 132446.
Sketch, next page.
- 58 -
Zone 183
IC 432
Reflection nebula
Observed with C8 on 2/1/92
Magnification: 62x
NGC 2067
Position: 0546+0006
Type: GN
Rating: 4 M
Class: Em
Dimensions: 8' x 3'
Observations:
C11 at 115x. Oblong splash of foggy breath on the eyepiece. Two faint stars (about
80" separation in PA 20) are involved.
NGC 2112
Other Names: Collinder 76, H VII 24
Astronomical League Program: Herschel II Club
Rating: 5 M
Position: 0554+0024
Type: Oc
Dimensions: 11'
Class: II 2mn
Cluster population: 90
- 59 -
Magnitude: 9.1
Zone 183
Notes:
This cluster lies 30,000 light years from the galactic center and 570 light years below
the galactic plane.
The brightest star is 10m (50 times brighter than the Sun).
This group is 2 billion years old!
Observations:
C8 at 83x. Faint and unresolved, with a NW/SE axis. Note the 9m star near the NW
end.
C11 at 98x. Grainy and semi-resolved. A neat little jagged row of four 10m stars lies
just N and W of the center.
Model (where the Sun is a baseball):
Its diameter would be 2,680 miles, with stars 300 miles apart.
Distance (LY): 2,600
Luminosity (suns): 120
Zone 183, Map 9
Double Stars
Easy
STF 790
Rating: 2 E
ADS 4361; HD 38495; SAO 132515
Position: 0546-0416
A
B
Magnitude
6.24
8.95
Separation PA
—
—
7.0 +
89 =
Notes:
1830: 6.8 @ 89. 19 measurements.
Observations:
C8 at 104x. Webb saw them as rY and B.
- 60 -
Year
—
1991
Spectra
K1 III
G0 IV
Colors
rO!
B!
Zone 183
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 31.2 inches; B = 16.6 inches.
Separation: AB = 4.05 miles.
Distance (LY): 371
Total luminosity (Suns): 34
STF 792
Rating: 2 E
HD 294369
Position: 0547-0316
A
B
Magnitude
8.49
8.91
Separation PA
—
—
24.8 132 -
Year
—
1991
Spectra
G0 V?
A5
Colors
Y
W
Notes:
1831: 24.9 @ 134. 11 measurements. Hipparcos/Tycho data show different
distances for these stars; they may be optical.
Observations:
C8 at 104x; very nice. Dominates a moderate field. Webb said, "Very pretty."
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 16.2 inches; B = 6.00 inches.
Separation: AB = 11.7 miles.
Distance (LY): 303
Total luminosity (Suns): 5
A 2918
Rating: 4 E
ADS 4321; HD 294334; SAO 132496
Position: 0544-0229
A
B
C
Magnitude
9.43
9.77
10.50
Separation
—
95 =
0.5 +
PA
—
316 =
200 +
Notes:
AB 1915: 95 @ 316. 3 measurements.
AC 1915: 0.4 @ 180. 3 measurements.
- 61 -
Year
—
1991
1979
Spectra
A2
Colors
W
W
No
Zone 183
Observations:
C11 at 115x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 7.67 inches.
Separation: AB = 96.4 miles; AC = 2,640 feet.
Distance (LY): 650
Total luminosity (Suns): 11.8
A 322
Rating: 4 E
ADS 4557; HD 40397; SAO 132703
Position: 0558-0439
A
B
Magnitude
6.99
9.43
Separation PA
—
—
179.4 +
297 +
Year
—
1911
Spectra
G0
Colors
yW
O
Notes:
1892: 176.8 @ 296. 3 measurements. May be optical because Hipparcos gives
different distances (76 and 208 light years).
A has a 13.6m companion at 3.9".
Observations:
C8 at 104x.
Schjellerup 3
Rating: 5 E
HD 39022; SAO 132575
Position: 0550-0428
A
B
Magnitude
8.43
11.00
Separation PA
—
—
65.6 +
319 +
Notes:
1894: 62.9 @ 318. 7 measurements.
Observations:
C8 at 104x.
- 62 -
Year
—
1991
Spectra
G5
Colors
yO
W
Zone 183
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 19.9 inches.
Separation: AB = 69.6 miles.
Distance (LY): 680
Total luminosity (Suns): 21
Moderate
Zeta Ori
Rating: 3 M
50 Ori; Alnitak, "the girdle"; STF 774; ADS 4263; HD 37742; SAO 132444
Astronomical League Program: Double Star Club
Position: 0541-0157
A
B
Magnitude
1.74
3.87
Separation PA
—
—
2.4 +
165 +
Year
—
1998
Spectra
O9 Ib
B3 III
Colors
W
Y
Notes:
The German Kunowsky discovered this pair in 1819. (William Herschel missed it!)
1822: 2.3 @ 152. Over 100 measurements. The pair is probably about 1,280 AU
apart. The orbital period may be 1,509 years (Hopmann, 1967).
The A star has 18 solar masses and is ejecting mass at 1,800 km/sec; B has 6 solar
masses. The diameter of A has been determined by interferometer: 0.00047".
Both stars are spectroscopic binaries, and the B star is an infra-red source.
The whole system is part of the Ori OB1 Association.
There is a third star (10.0m) at 57.7 @ 10 (1990).
From James Kaler's Star Notes:
Separate Alnitak from the belt and it becomes a most remarkable star in its own right,
the brightest class O star in the sky, a hot blue supergiant. Tucked right next to it is a
companion, a blue class B hydrogen-fusing star about three seconds of arc away, the pair
orbiting each other with a period estimated to be thousands of years long.
The region around Alnitak is remarkable as well, containing several dusty clouds of
interstellar gas, including the famed "Horsehead Nebula" to the south. Its 31,000 Kelvin
surface radiates mostly in the ultraviolet where the eye cannot see, and when that is taken
into account, Alnitak's luminosity climbs to 100,000 times solar. A planet like the Earth
would have to be 300 times farther from Alnitak than Earth is from the Sun (8 times
Pluto's distance) for life like ours to survive. Such brilliance can only come from a star of
great mass, Alnitak's estimated to be about 20 times solar (its dimmer companion's about
14 times solar).
- 63 -
Zone 183
Like all O stars, Alnitak is a source of X-rays that seem to come from a wind that
blows from its surface at nearly 2,000 kilometers per second, the X- rays produced when
blobs of gas in the wind crash violently into one another. Massive stars use their fuel
quickly and do not live very long. Alnitak is probably only about 6 million years old (as
opposed to the Sun's 4.5 billion year age) and it has already begun to die, hydrogen
fusion having ceased in its core. The star will eventually become a red supergiant
somewhat like Betelgeuse and almost certainly will explode as a supernova, leaving its
companion orbiting a hot, madly spinning neutron star.
Observations:
C8 at 280x. Some observers note pB and O, or Y and pV, or Y and B, or W and W.
Wilhelm Struve called it "slightly reddish olive" ("olivacea subrubicunda").
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 24 inches; B = 180 inches.
Separation: AB = 3.07 miles.
Distance (LY): 820
Total luminosity (Suns): 12,750
Difficult
h2280
Rating: 5 D
HD 38915
Position: 0549-0319
A
B
Magnitude
9.85
12.67
Separation PA
—
—
17.4 24 +
Notes:
1911: 18.2 @ 22. 3 measurements.
Observations:
C8 at 104x. A brighter pair lies 10 min W.
- 64 -
Year
—
1991
Spectra
F0
Colors
W
?
Zone 183
Deep Sky Objects
Easy
IC 435
Position: 0542-0219
Type: Gn
Dimensions: 5' x 3'
Rating: 4 E
Class: R
Magnitude: 11.0
Observations:
C8 at 37x. It is bright and has SAO 132478 (8.5m, blue) at the center. I found
medium powers to be best. Note the dark area to the east.
Difficult
NGC 2024
Other Names: H V 28; The Tank Track Nebula
Astronomical League Program: Herschel 400 Club
Rating: 3 D
Position: 0541-0227
Type: Gn
Class: E
Dimensions: 30'
Observations:
C8 at 37x. Large and faint; I found it best to set the scope just W of it and turn off the
clock drive, letting it "sneak" into view. There is a dark band across the center, and Zeta
Ori is a pest! A narrow band filter is a tremendous help on this nebula.
NGC 2023
Other Names: H IV 24
Astronomical League Program: Herschel II Club
Rating: 5 D
Position: 0542-0214
Type: Gn
Class: E+R
- 65 -
Dimensions: 10'
Zone 183
Notes:
This is a piece of the Orion Nebula.
Observations:
C8 at 37x. It is very faint and splotchy and lies just S of Zeta Ori and surrounds a
10m star.
C11 at 98x. It resembles breath on an cold eyepiece. Noticeable,
but faint.
- 66 -
Zone 183
Zone 183 Mini-Catalog
Double Stars
Designation
Position
Rating
Map
Delta Ori
0532-0017
1E
5
Sigma Ori
0539-0236
1E
6
STF 700
0523+0103
2E
5
23 Ori
0523+0332
2E
4
Winnecke 2
0524-0052
2E
5
25 Ori
0525+0151
2E
5
OSS 65
0538+0058
2E
5
STF 790
0546-0416
2E
9
STF 792
0547-0316
2E
9
STF 818
0555+0443
2E
7
STF 627
0501+0337
3E
1
STF 630
0502+0137
3E
2
STF 639
0504-0251
3E
3
66 Eri
0507-0439
3E
3
h702
0528-0156
3E
6
Dembowski 8
0529-0200
3E
6
STF 721
0530+0309
3E
Component
A
B
C
a
A
B
C
D
E
A
B
A
B
A
B
A
B
C
A
B
A
B
A
B
A
B
A
B
A
B
C
D
BC
A
B
A
B
A
B
A
B
C
D
CD
A
B
C
BC
4
- 67 -
Mag
2.3
14
6.84
3.60
3.77
4.98
8.79
6.66
6.34
7.08
7.31
4.99
7.17
6.87
6.96
8.1
8.3
4.7
7.47
8.02
6.24
8.95
8.49
8.91
9.84
10.06
6.65
7.03
6.45
7.97
10.7
9.5
8.16
8.87
5.12
8.4
7.98
9.32
9.34
10.11
9.9
12.46
6.94
8.4
9.7
Separation
—
33.1 53.2 +
0.3 +
—
0.2 =
11.4 13.0 +
41.7 +
—
4.8 +
—
32.5 +
—
3.0 +
—
46
158
—
79.6 —
7.0 +
—
24.8 —
6.1 +
—
21.3 =
—
14.4 +
130.3
PA
—
227 =
53.2 +
140 —
287 11.4 13.0 +
62 +
—
5=
—
29 +
—
159 —
220
158
—
31 =
—
89 =
—
132 —
278 +
—
260 =
—
50 +
130.3
0.4 —
5.6 +
—
53.1 +
—
24.1 —
5.7 +
102.9 +
16 —
80 +
—
10 +
—
149 =
—
46 102.9 +
16.7 +
—
24.9 +
354 —
149 =
0.2 -
160 +
Zone 183
Designation
Position
Rating
Map
Sh 61
0532+0250
3E
4
H V 118
0534-0102
3E
5
STF 751
0536-0059
3E
5
STF 761
0539-0233
3E
6
STF 782
0543+0001
3E
8
STF 788
0545+0350
3E
7
STF 789 rej
0545+0400
3E
7
STF 809
0551-0126
3E
8
STF 819
0555-0056
3E
8
STF 628 rej
0501+0316
4E
1
A. G. 87
Jonckheere
307
0503+0436
4E
1
0504-0231
4E
3
Bur 1006
0512-0211
4E
3
Rho Ori
0513+0251
4E
1
Kustner 86
0516+0259
4E
1
STF 682 rej
0519+0359
4E
1
Webb 3
0523+0117
4E
5
STF 702
0524+0222
4E
4
H IV 68
0525-0249
4E
6
Baillaud 670
0528-0038
4E
5
h2270
0531-0416
4E
6
Baillaud 1294
0531+0137
4E
5
Component
A
B
A
B
A
B
A
B
C
D
A
B
C
A
B
C
A
B
C
A
B
C
A
B
A
B
A
B
A
B
A
B
C
A
B
C
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
C
- 68 -
Mag
7.53
8.91
6.22
11.2
8.02
8.96
7.91
8.6
8.6
8
8.5
8.83
11.7
7.64
10.03
10.3
6.09
10.14
12.2
8.08
10.18
9.38
8.18
9.94
8.1
9.71
9.07
10.48
6.73
9.16
9.19
11.4
10.01
4.59
8.29
11.33
9.49
10.03
9.29
10.58
7.29
10.45
9.57
10.14
7.34
9.09
9.18
10.47
7.54
11.08
8.55
10.17
11.3
Separation
—
66.9 —
28.0 +
—
15.6 =
—
67.9 73.6 +
33.8 +
—
46.0 +
131.7
—
7.5 +
35.9 —
15.6 1.1 —
0.9 24.4 —
25.6 +
—
22.7 —
33.9 +
—
53.1 +
—
0.4 51.9 —
7.0 182.4
—
36.1 —
16.7 —
62.5 +
—
8.5 +
—
135.8 —
11.4 -!
—
28.0 +
—
9.7 =
41.6 -
PA
—
353 =
—
265 +
—
123 —
201 73.6 +
33.8 +
—
306 131.7
—
89 +
35.9 —
149 1.1 —
95 24.4 —
98 +
—
47 =
—
286 +
—
320 —
240 +
51.9 —
65 +
182.4
—
117 +
—
112 +
—
10 —
80 +
—
282 +
—
307 —
341 +
—
51 +
41.6 -
Zone 183
Designation
Position
Rating
Map
STF 731
0531-0206
4E
6
A. G. 96
0533+0228
4E
4
STF 746 rej
0535-0441
4E
6
STF 756 rej
0538+0219
4E
4
STF 757
0538-0011
4E
5
A 2918
0544-0229
4E
9
STF 797
0548+0442
4E
7
A 322
0558-0439
4E
9
A. G. 85
0502+0419
5E
1
Baillaud 2627
0508+0431
5E
1
Barton 534
0513-0347
5E
3
Baillaud 1667
0526+0250
5E
4
Baillaud 2149
0529+0334
5E
4
Epsilon Ori
0536-0112
5E
5
Pritchett 1
0537+0006
5E
5
Harvard 75
0538-0103
5E
5
Baillaud 2643
0550+0416
5E
7
Schjellerup 3
0550-0428
5E
9
Baillaud 2644
0551+0429
5E
7
59 Ori
0558+0150
5E
8
Bur 1189
0558+0022
5E
8
Webb 4
0529-0442
2M
6
Component
A
B
C
D
A
B
A
B
A
B
C
A
B
C
D
E
A
B
C
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
C
BC
A
B
A
B
A
B
A
B
A
B
A
B
A
B
- 69 -
Mag
8.08
8.71
9.61
11.05
9.72
10.7
8.65
10.36
11.3
7.98
8.41
8.66
8.56
10.10
9.43
9.77
10.5
7.29
9.97
6.99
9.43
9.49
10.44
10.78
12.65
9.74
10.05
10.39
11.6
10.38
11.76
1.69
11.64
9.39
10.25
11
10.69
11
10.02
10.45
8.43
11
9.99
11.86
5.88
10.57
7.98
8.28
10.23
11.16
Separation
—
4.6 =
163.8
11.2
—
4.5 —
13.8 —
23.7 =
56.5
—
1.551.4 +
41.4 137.8 —
95 =
0.5 +
—
7.3 +
—
179.4 +
—
9.4 —
16.3 —
4.0 —
7.9 +
—
19.2
—
178.5 —
28.3
PA
—
328 -?
163.8
11.2
—
237 +
—
217 —
237 +
56.5
—
239 51.4 +
41.4 264 +
—
316 =
0.5 +
—
17 +
—
297 +
—
176 —
162 —
180 +
—
310 +
—
169
—
59 +
—
137
6.6+
—
29.0
—
16.5 +
—
65.6 +
—
18.2
—
35.6 —
26.4 —
47.7 +
41 -!
—
344
—
357 —
319 +
—
356
—
205 —
195 =
—
52 +?
Zone 183
Designation
Position
Rating
Map
31 Ori
0530-0103
2M
5
STF 708
0525+0155
3M
5
STF 712
0526+0256
3M
4
Zeta Ori
0541-0157
3M
9
A. G. 89
0506+0257
4M
1
STF 678
0518+0441
4M
1
h2267
0529+0139
4M
5
STF 750
0535-0422
4M
6
STF 741
0535-0008
4M
5
Jonckheere 36
0548+0354
4M
7
h2257
0513-0439
5M
3
h697
0522-0025
5M
5
STF 693
0522-0203
5M
6
Engelmann 20
0532-0341
5M
6
Baillaud 312
0551-0116
5M
8
60 Ori
0559+0033
5M
8
Eta Ori
0524-0224
1D
6
STF 652
0512+0102
4D
2
Psi 2 Ori
0527+0305
4D
4
33 Ori
0531+0318
4D
4
STF 734
0533-0143
4D
5
42 Ori
0535-0450
4D
Component
A
B
A
B
A
B
C
A
B
A
B
A
B
C
A
B
A
B
A
B
A
B
A
B
A
B
C
A
B
A
B
A
B
A
B
A
B
C
A
B
A
B
C
A
B
C
A
B
C
D
CD
A
B
6
- 70 -
Mag
4.69
9.9
7.43
8.55
6.52
8.47
1.74
3.87
9.18
10.19
8.47
8.82
12.62
6.91
12.65
6.56
8.52
7.14
10.13
7.83
9.56
6.96
11.7
5.68
11.3
11.88
8.49
8.92
7.92
10.4
9.24
11.05
5.22
11.8
3.35
4.91
9.4
6.29
7.51
4.59
8.67
13.88
5.79
7.1
13.4
6.75
8.27
9.49
9.33
4.58
7.9
Separation
—
14.1 +
—
2.7 +
—
3.2 +
131.8
—
2.4 +
—
2.1 +
—
3.5 +
77.6 +
—
25.0
—
4.3 =
—
10.1 —
1.5 —
33.3 —
33.1 +
38.4 —
3.5 —
231.6 +!!
—
6.9 —
19.0 —
1.7 +
116.8 +
—
1.7 =
—
2.9 +
83.4
—
1.9 =
94.9 —
1.7 29.4 +
PA
—
86 —
322 —
64 +
131.8
—
165 +
—
359 +
—
103 +
77.6 +
—
111
—
60 +
—
286 =
—
101 —
270 +
—
60 =
38.4 —
11 +
—
312 +!!
—
156 =
—
31 +
—
80 116.8 +
—
181 —
327 +
83.4
—
28 +
94.9 —
350 29.4 +
0.7 —
1.1 -
296 =
—
208 -
Zone 183
Designation
Position
Rating
Map
A 53
0519-0305
5D
3
STF 743
0535-0424
5D
6
h2280
0549-0319
5D
9
h2283
0555+0136
5D
8
STF 826
0559-0120
5D
8
Component
A
B
C
A
B
C
D
A
B
A
B
A
B
Mag
7.77
11.23
11.37
7.74
8.25
8.5
9.85
12.67
11.19
12.64
8.84
9.68
Separation
—
3.1 196.7
—
1.8 =
51.5
10.9
—
17.4 —
18.7
—
1.9 +
PA
—
354 -!
196.7
—
283 +
51.5
10.9
—
24 +
—
9
—
132 +
Deep Space Objects
Object
NGC 1973
Collinder 70
NGC 2071
NGC 1981
IC 435
NGC 2068
IC 432
NGC 2067
NGC 2112
NGC 1975
NGC 1977
NGC 2024
NGC 1762
NGC 1788
NGC 1990
NGC 2023
Position
0535-0444
0536-0100
0547+0018
0535-0426
0542-0219
0547+0003
0541-0129
0546+0006
0554+0024
0535-0441
0536-0452
0541-0227
0504+0134
0507-0321
0536-0112
0542-0214
Rating
3E
3E
3E
4E
4E
4E
2M
4M
5M
3D
3D
3D
4D
5D
5D
5D
Map
6
5
8
6
9
8
8
8
8
6
6
9
2
3
5
9
Type
Gn (E+R)
Oc
GN (Emm/Refl)
Oc (III 3pn)
Gn (R)
Gn (R)
Gn (R)
GN (Em)
Oc (II 2mn)
Gn (E+R)
Gn (E+R)
Gn (E)
Gal (SA(rs)c:)
Gn (R)
Gn (Emm/Refl)
Gn (E+R)
- 71 -
Specifications
Surface
Mag
Br
—
4.0
Population
20
8.0
11.0
8.0
—
50
9.1
—
—
—
12.6
—
90
—
13.0