Zone 138, Master Map
Normal View
Zone Master, Normal View, 10 deg FOV
ψ
ω1
ω2
υ1
λ
e
c
µ1
η
f
Asellus Australis
d
θ
ζ1
ζ2
+16°00'
δ
+18°00'
ε
Gemini
Beehive Cluster
Praesepe
ο2
ο1
09h 04m
08h 56m
+20°00'
µ2
γ Asellus Borealis
CancerM44
+22°00'
υ2
+24°00'
ν
08h 48m
08h 40m
08h 32m
08h 24m
08h 16m
08h 08m
08h 00m
Zone 138, Map 1
Normal Image
+25°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
Omega 2 Cncω2
NGC 2498
Upsilon 1 Cnc
+24°00'
STF 1220
λ
STF 1171
STF 1227
+23°00'
NGC 2512
STF 1218
µ1
+22°00'
NGC 2577
+21°00'
µ2
h448
Couteau 91
OS 191 rej
Hough 525
08h 30m
08h 25m
Gemi
08h 20m
08h 15m
08h 10m
08h 05m
08h 00m
Zone 138, Map 1
Mirror Image
+25°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
ω2
Omega 2 Cnc
NGC 2498
NGC 2498
Upsilon 1 Cnc
υ1
λ
+24°00'
STF 1220
STF 1171
STF 1218
µ1
STF 1227
+23°00'
NGC 2512
+22°00'
NGC 2577
µ2
+21°00'
h448
Couteau 91
OS 191 rej
Hough 525
Gemini
08h 00m
08h 05m
08h 10m
08h 15m
08h 20m
08h 25m
08h 30m
Zone 138, Map 2
Normal Image
OS 191 rej
Hough 525
Gemi
h444
+20°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
+19°00'
h2423
STF 1191
Opik 13
Hough 524
+18°00'
Soulie 466
ζ1
ζ2
Zeta Cnc
STF 1214
STF 1173
STF 1230
Soulie 468
+17°00'
Bur 1243
+16°00'
Soulie 469
Heintz 144
NGC 2507
08h 30m
08h 25m
08h 20m
08h 15m
08h 10m
08h 05m
08h 00m
Zone 138, Map 2
Mirror Image
+20°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
OS 191 rej
Hough 525
Gemini
h444
+19°00'
h2423
STF 1191
Opik 13
Hough 524
+18°00'
Soulie 466
STF 1214
STF 1173
STF 1230
Soulie 468
+17°00'
Bur 1243
ζ1
ζ2 Zeta Cnc
STF 1167
+16°00'
Soulie 469
NGC 2507
08h 00m
08h 05m
08h 10m
08h 15m
08h 20m
08h 25m
08h 30m
Zone 138, Map 3
Normal Image
+24°00'
Hough 649
υ1
υ2
+25°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
STF 1262
STF 1297
+23°00'
A. G. 154
A. G. 157
+22°00'
h2451
Barton 2390
Gamma Cnc
+21°00'
Asellus Borealisγ
STF 1285
η
Soulie 339
Soulie 336
Praesepe
M44
Beehive Cluster
09h 00m
08h 55m
08h 50m
08h 45m
08h 40m
08h 35m
08h 30m
Zone 138, Map 3
Mirror Image
υ1
+24°00'
+25°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
υ2
STF 1262
+23°00'
A. G. 154
A. G. 157
+22°00'
h2451
Barton 2390
Asellus Borealisγ
Gamma Cnc
+21°00'
h448
STF 1285
η
Praesepe
M44
Beehive Cluster
08h 30m
08h 35m
Soulie 336
Soulie 339
NGC 2632
08h 40m
08h 45m
08h 50m
08h 55m
09h 00m
Zone 138, Map 4
Normal Image
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
+20°00'
Praesepe
M44
Soulie 336
STF 1249 rej
Beehive Cluster
STF 1269
South 570
ε
STF 1254
+19°00'
Epsilon Cnc
South 571
NGC 2672
Delta Cnc
Barton 2392
δ
θ
Asellus Australis
Theta Cnc
Kustner 33
+18°00'
Soulie 339
+17°00'
h4135
+16°00'
A. G. 338
A 2472
ο2
ο1
STF 1283
09h 00m
08h 55m
08h 50m
08h 45m
08h 40m
08h 35m
08h 30m
Zone 138, Map 4
Mirror Image
Praesepe
M44
Soulie 336
+20°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
Soulie 339
STF 1249 rej
Beehive Cluster
STF 1254 ε
Epsilon Cnc
STF 1269
South 571
+19°00'
South 570
θ
+18°00'
NGC 2672
δ
Theta Cnc
Barton 2392
Delta Cnc Asellus Australis
Kustner 33
+17°00'
h4135
+16°00'
A. G. 338
A 2472
Heintz 144
ο2
ο1
STF 1283
08h 30m
08h 35m
08h 40m
08h 45m
08h 50m
08h 55m
09h 00m
Zone 138, Map 5
Normal Image
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
Soulie 336
+20°00'
Soulie 339
NGC 2632
M44
Beehive Cluster
Praesepe
South 570 STF 1249 rej
STF 1254
ε
South 571
Epsilon Cnc
+19°00'
STF 1269
08h 45m
08h 40m
08h 35m
Zone 138, Map 5
Mirror Image
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
Soulie 339
+20°00'
Soulie 336
NGC 2632
Beehive Cluster
Praesepe
M44
STF 1249 rej South 570
STF 1254
South 571
Epsilon Cnc
ε
+19°00'
STF 1269
08h 35m
08h 40m
08h 45m
Zone 138
33 Double Stars, 1 Open Cluster, 5 Galaxies
B
O
Barton 2390 ......................................... 15
Barton 2392 ......................................... 17
Bur 1243 ................................................ 8
OS 191 rej .............................................. 2
S
Soulie 336 ............................................ 22
Soulie 339 ............................................ 22
South 570 ............................................. 20
South 571 ............................................. 19
STF 1171................................................ 5
STF 1173................................................ 7
STF 1191.............................................. 10
STF 1214.............................................. 11
STF 1218................................................ 5
STF 1220................................................ 3
STF 1227................................................ 3
STF 1230................................................ 9
STF 1249 rej ........................................ 21
STF 1254.............................................. 20
STF 1262.............................................. 13
STF 1269.............................................. 16
STF 1285.............................................. 15
C
Couteau 91............................................. 4
E
Epsilon Cnc.......................................... 21
G
Gamma Cnc ......................................... 14
H
h2423 ................................................... 12
h2451 ................................................... 14
h4135 ................................................... 18
h444 ..................................................... 10
h448 ....................................................... 4
Hough 524 ............................................. 9
N
T
NGC 2498.............................................. 6
NGC 2507............................................ 13
NGC 2512.............................................. 7
NGC 2577.............................................. 6
NGC 2632............................................ 23
NGC 2672............................................ 18
Theta Cnc............................................. 16
U
Upsilon 1 Cnc ........................................ 2
Z
Zeta Cnc............................................... 11
-1-
Zone 138
Zone 138, Map 1
Double Stars
Easy
Upsilon 1 Cnc
24 Cnc; STF 1224; ADS 6811; HD 71152; SAO 80184
Position: 0827+2432
A
B
Magnitude
6.51
7.38
Separation PA
—
—
5.4 50 +
Year
—
1996
Rating: 1 E
Spectra
F0 V
F6
Colors
W
Y
Notes:
1820: 6.3 @ 35. Over 100 measurements. Both components may be variable.
Aitken divided B in 1908, 8.0m and 8.1m, 0.2 @ 141. Orbit takes 21.73 years, with
semi-major axis of 0.149" and direct motion.
Observations:
C8 at 104x. This is a beautiful pair in an empty field.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 5.70 inches; B = 13.1 inches.
Separation: AB = 2.08 miles.
Distance (LY): 248
Total luminosity (Suns): 15.9
OS 191 rej
Rating: 2 E
HD 70826; SAO 80164
Position: 0825+2009
A
B
Magnitude
7.34
8.72
Separation PA
—
—
37.5 191 =
Year
—
1999
Spectra
A5
A5
Colors
W
B
Notes:
1843: 37.6 @ 191. 19 measurements.
Hipparcos/Tycho data show different distances for these stars (740 and 840 light
years); they may be optical. However, the stars exhibit a small common proper motion.
-2-
Zone 138
Observations:
C8 at 83x.
STF 1227
Rating: 2 E
ADS 6816; HD 71309; SAO 80195
Position: 0827+2309
A
B
Magnitude
8.06
9.79
Separation PA
—
—
25.0 +
163 =
Year
—
1991
Spectra
A0 V
A0
Colors
W
W
Notes:
1828: 24.6 @ 163. 19 measurements. The stars share common proper motion.
Observations:
C8 at 83x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 9.00 inches; B = 6.77 inches.
Separation: AB = 6.71 miles.
Distance (LY): 172
Total luminosity (Suns): 1.6
STF 1220
Rating: 3 E
ADS 6797; HD 70897; SAO 80171
Position: 0826+2421
A
B
Magnitude
8.57
10.24
Separation PA
—
—
29.2 214 +
Year
—
1991
Spectra
K0
Colors
W
B
Notes:
1828: 29.9 @ 208. 12 measurements.
Observations:
C8 at 83x. Eddy O'Connor (Terara, Australia, 12-inch dob) saw them as pB and dB.
-3-
Zone 138
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 25.2 inches.
Separation: AB = 48.3 miles.
Distance (LY): 1,060
Total luminosity (Suns): 39
Couteau 91
Position: 0808+2106
A
B
Magnitude
9.41
11.09
Rating: 5 E
Separation PA
—
—
10.6 +
148 -
Year
—
1991
Spectra
K5
Colors
Y
W
Notes:
1893: 9.8 @ 162. 16 measurements.
Observations:
C11 at 98x. With two 11m stars, it formas a large right triangle.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 37.2 inches.
Separation: AB = 4,858 feet.
Distance (LY): 56
Total luminosity (Suns): 0.55
h448
Rating: 5 E
HD 71324; SAO 80199
Position: 0828+2128
A
B
Magnitude
9.01
11.66
Separation PA
—
—
31.3 324 -
Notes:
1895: 31.6 @ 327. 3 measurements.
-4-
Year
—
1915
Spectra
K0
Colors
Y
?
Zone 138
Observations:
C8 at 104x. It is 5 min SW of the galaxy NGC 2595, an extremely low surface
brightness spiral of 3 min x 2 min size and an integrated magnitude of 12.9-- but that 12.9
is spread out over a lot of square minutes, so it is very difficult to see, except for a stellar
nucleus..
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 25.8 inches.
Separation: AB = 30.8 miles.
Distance (LY): 630
Total luminosity (Suns): 10.65
Moderate
STF 1218
Rating: 4 M
ADS 6781; SAO 80145
Position: 0824+2311
A
B
Magnitude
9.50
11.00
Separation PA
—
—
4.2 268 -
Year
—
1934
Spectra
F2
Colors
W
B
Notes:
1831: 4.3 @ 269. 12 measurements.
Observations:
C8 at 206x.
Difficult
STF 1171
Rating: 5 D
ADS 6513; HD 65757; SAO 79864
Position: 0801+2335
A
B
Magnitude
6.51
9.95
Separation PA
—
—
2.1 326 -
-5-
Year
—
1991
Spectra
K1 III
Colors
Y
O
Zone 138
Notes:
1828: 2.8 @ 339. 30 measurements.
Observations:
C8 at 280x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 2.40 inches.
Separation: AB = 4,752 feet.
Distance (LY): 276
Total luminosity (Suns): 18.5
Deep Sky Objects
Difficult
NGC 2498
Other Names: UGC 4142
Rating: 4 D
Position: 0800+2459
Type: Gal
Surface brightness: 13.1
Class: SBa
Dimensions: 1.1' x 0.8'
Magnitude: 13.4
PA: 113
Observations:
C11 at 125x. Small and very faint fuzzy star on the west leg of a narrow 10m-10m12m triangle. No nucleus detected.
Radial velocity (km/sec): +4,720
NGC 2577
Other Names: H II 259; UGC 4367
Rating: 4 D
Position: 0823+2233
Type: Gal
Surface brightness: 13.0
Class: S0-:
Dimensions: 1.8' x 1.1'
-6-
Magnitude: 12.4
PA: 105
Zone 138
Notes:
Member of the Cancer Cluster.
Observations:
C8 at 206x. Very faint; it took tube movement with averted vision to detect, at which
point it became easier to see. It has a sharp, star-like nucleus and an extensive halo.
About 20 min S is a sharp little asterism, a cascade of 5 stars of 8.4m and fainter.
Radial velocity (km/sec): +2,057
NGC 2512
Other Names: H III 605; UGC 4191
Rating: 5 D
Position: 0803+2324
Type: Gal
Surface brightness: 13.1
Class: SBb
Dimensions: 1.7'
Magnitude: 13.1
PA: 113
Observations:
C8 at 206x. Extremely faint, and with no noticeable nucleus.
Radial velocity (km/sec): +4,702
Zone 138, Map 2
Double Stars
Easy
STF 1173
Rating: 2 E
ADS 6519; HD 65857; SAO 97483
Position: 0802+1657
A
B
Magnitude
8.42
10.06
Separation PA
—
—
10.5 +
52 +
-7-
Year
—
1991
Spectra
G0
G5
Colors
B
R
Zone 138
Notes:
1830: 9.8 @ 50. 17 measurements. The stars have different proper motions.
Observations:
C8 at 65x. Kepple and Sanner say Y and bW. Eddy O'Connor (Terara, Australia, 12inch dob) saw them as pB and R. William Schart (Killeen, TX, C8) used a MicroGuide
and obtained 9.4" @ 48.7.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 17.3 inches; B =21.7 inches.
Separation: AB = 3.76 miles.
Distance (LY): 230
Total luminosity (Suns): 5.9
Bur 1243
Rating: 4 E
ADS 6673; HD 68703; SAO 97669; H IV 78
Position: 0814+1741
A
B
C
D
Magnitude
6.47
12.30
9.20
8.00
Separation
—
1.5 +
63.0 232.2
PA
—
332 301 323
Year
—
1957
1989
1989
Spectra
F9 V
Notes:
AB 1891: 1.4 @ 344. 6 measurements.
AC 1894: 64.4 @ 302. 12 measurements.
AD 1 measurement.
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 31.5 inches.
Separation: AB = 4,066 feet; AC = 32.3 miles; AD = 119 miles.
Distance (LY): 329
Total luminosity (Suns): 31.1
-8-
Colors
W
No
W?
W
Zone 138
Hough 524
Opik 13; ADS 6696; HD 69072; SAO 97684
Position: 0816+1841
A
B
C
Magnitude
7.54
10.50
10.90
Separation
—
4.4 +
40.0
PA
—
344 =
70
Rating: 4 E
Year
—
1992
1926
Spectra
K0
Colors
Y
?
No
Notes:
AB 1894: 3.9 @ 344. 12 measurements.
AC 1 measurement.
Observations:
C8 at 206x. It is in the middle of a chain of three stars (E one is 9m, W one is 10m).
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 23.6 inches.
Separation: AB = 4.25 miles; AC = 38.7 miles.
Distance (LY): 620
Total luminosity (Suns): 32
STF 1230
Rating: 4 E
SAO 97840
Position: 0828+1651
A
B
Magnitude
9.20
10.39
Separation PA
—
—
33.5 +
187 -
Year
—
1991
Spectra
G5
Colors
yW
B
Notes:
1829: 28.0 @ 194. 23 measurements. The stars show similar proper motions.
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 20.8 inches.
Separation: AB = 42.9 miles.
Distance (LY): 820
Total luminosity (Suns): 14
-9-
Zone 138
STF 1191
Rating: 5 E
ADS 6637; SAO 97624
Position: 0811+1902
A
B
Magnitude
9.94
10.80
Separation PA
—
—
3.5 +
76 +
Year
—
1999
Spectra
G5
Colors
yW
W
Notes:
1829: 3.2 @ 71. 14 measurements.
Observations:
C11 at 115x.
h444
Rating: 5 E
HD 69628; SAO 97720
Position: 0818+1937
A
B
Magnitude
8.44
10.08
Separation PA
—
—
37.1 +
96 -
Year
—
1991
Notes:
1894: 35.7 @ 97. 5 measurements.
Observations:
C8 at 104x. This star sits on the ecliptic.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 13.4 inches.
Separation: AB = 13.3 miles.
Distance (LY): 230
Total luminosity (Suns): 2.2
- 10 -
Spectra
F5
Colors
yW
B
Zone 138
Moderate
STF 1214
Bur 1320 (C); ADS 6744;
Position: 0820+1700
A
B
C
Magnitude
10.63
11.00
12.20
Rating: 5 M
Separation
—
4.9 +
0.6 +
PA
—
0=
175 +
Year
—
1964
1964
Spectra
F8
Colors
pO
?
No
Notes:
AB 1904: 4.8 @ 0. 11 measurements.
BC 1904: 0.4 @ 173. 3 measurements.
Observations:
C11 at 115x. C was never detected at any power.
Difficult
Zeta Cnc
Rating: 1 D
16 Cnc; Tegmeni, "in the shell"; STF 1196; ADS 6650; HD 68257; SAO 97646
Position: 0812+1739
A
B
C
D
Magnitude
5.67
5.86
6.30
9.70
Separation
—
0.8 6.4 +
280.3 -
PA
—
83 +
77 -!
107 -
Year
—
2000
1994
1991
Spectra
F8 V
G0 V
Colors
Y
Y
B
W
Notes:
T. Mayer discovered this system in 1756, when he listed it as a double, a practice that
continued until 1781, when William Herschel found a third star.
AB 1826: 1.1 @ 59. Over 100 measurements. Stars A and B are both the same mass
as the Sun. They are also each as bright as the Sun. The orbital period is 59.70 years
(Gasteyer, 1954) and they are about 19 AU apart (the distance from the Sun to Uranus).
The motion is retrograde.
AC 1821: 5.7 @ 160. Over 100 measurements. The C star is 175 AU from A and
has about 90% of the Sun’s mass. It also has an invisible companion with an orbital
period of 17.64 years, lying some 5 AU away. The companion is probably a red dwarf.
The ABxC orbit takes 1,150 years (Gasteyer, 1954).
- 11 -
Zone 138
AD 1887: 293.4 @ 108. 6 measurements. The D star is 90% as massive as the Sun.
Observations:
C8 at 280x. Very attractive! Some observers note colors of Y, O and W, or W, W
and bG. Eddy O'Connor (Terara, NSW, Australia; 12" Dob)— bW, pR.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 3.60 inches; B = 14.5 inches.
Separation: AB = 510 feet; AC = 4,956 feet; AD = 36.3 miles..
Distance (LY): 83
Total luminosity (Suns): 11.16
h2423
Rating: 5 D
ADS 6517; HD 65802; SAO 97479
Position: 0801+1935
A
B
C
Magnitude
8.65
12.60
11.75
Separation
—
5.6 +
61.4
PA
—
263 =
230
Year
—
1925
1892
Spectra
F5
Colors
bW
?
?
Notes:
AB 1830: 5.0 @ 263. 7 measurements.
AC 1 measurement.
Observations:
C8 at 206x. The pair lies 15 min SE of SAO 97471 (6.3m K1 III, 80 times brighter
than the Sun, 560 light years away).
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 13.6 inches.
Separation: AB = 1.00 mile; AC = 11.1 miles.
Distance (LY): 116
Total luminosity (Suns): 0.329
- 12 -
Zone 138
Deep Sky Objects
Moderate
NGC 2507
Other Names: H II 554; UGC 4172
Rating: 5 M
Position: 0802+1543
Type: Gal
Surface brightness: 13.1
Class: S0/a pec
Dimensions: 1.8' x 1.7'
Magnitude: 12.2
Notes:
Peculiar, brightest in group, faint outer whirls.
Observations:
C8 at 206x. It has a stellar core and, with averted vision, a soft halo. A 10m star is
about 1 minSW.
Radial velocity (km/sec): +4,563
Zone 138, Map 3
Double Stars
Easy
STF 1262
Pourteau 3003; ADS 6934; HD 73973; SAO 80363
Position: 0842+2348
A
B
Magnitude
8.31
10.45
Separation PA
—
—
7.0 +
201 -
- 13 -
Rating: 3 E
Year
—
1991
Spectra
K0
Colors
Y
B
Zone 138
Notes:
1830: 6.6 @ 202. 20 measurements.
Observations:
C8 at 83x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 24.8 inches.
Separation: AB = 10.2 miles.
Distance (LY): 930
Total luminosity (Suns): 35
h2451
Rating: 4 E
SAO 80219
Position: 0834+2238
A
B
Magnitude
9.61
10.60
Separation PA
—
—
19.2 185 +
Year
—
1902
Spectra
K0
Colors
Y
W
Notes:
1894: 19.4 @ 184. 2 measurements.
May be optical; Hipparcos gives different distances (199 and 163 light years).
Observations:
C11 at 98x. With a 10m star, it makes a very acute triangle.
Gamma Cnc
43 Cnc; Asella Borealis; Engelmann 38; HD 74198; SAO 80378
Position: 0843+2128
A
B
Magnitude
4.66
10.19
Separation PA
—
—
114.3 +
67 +
Year
—
1999
Rating: 4 E
Spectra
A0 IV
Notes:
1188: 103.0 @ 66. 12 measurements.
Star A is a spectroscopic binary and a member of the Hyades group.
- 14 -
Colors
W
O
Zone 138
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 11.7 inches.
Separation: AB = 28.2 miles.
Distance (LY): 158
Total luminosity (Suns): 26.6
STF 1285
Position: 0851+2053
A
B
Magnitude
10.23
10.91
Rating: 5 E
Separation PA
—
—
25.8 339 -
Year
—
1991
Spectra
F8
G5
Colors
W
yW
Notes:
1828: 26.9 @ 340. 14 measurements.
Observations:
C11 at 115x.
Moderate
Barton 2390
Rating: 4 M
HD 73000; SAO 80284
Position: 0837+2210
A
B
Magnitude
8.32
12.77
Separation PA
—
—
4.5 83 +
Notes:
1939: 4.6 @ 75. 5 measurements.
Observations:
C8 at 83x. Moderate field.
- 15 -
Year
—
1995
Spectra
G0
Colors
Y
O
Zone 138
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 17.2 inches.
Separation: AB = 3.72 miles.
Distance (LY): 530
Total luminosity (Suns): 12
Zone 138, Map 4
Double Stars
Easy
STF 1269
Rating: 5 E
HD 74719; SAO 98108
Position: 0846+1915
A
B
Magnitude
9.78
10.10
Separation PA
—
—
11.5 =
309 +?
Year
—
1906
Spectra
A0
Colors
W
W?
Notes:
1827: 11.5 @ 128. 6 measurements. Quadrant reversal?
Observations:
C11 at 115x.
Moderate
Theta Cnc
31 Cnc; h2452; HD 72094; SAO 97881
Position: 0832+1806
A
B
Magnitude
5.35
10.00
Rating: 4 M
Separation PA
—
—
70.4 +! 62 +
- 16 -
Year
—
1988
Spectra
K5 III
Colors
O
W
Zone 138
Notes:
1862: 58.4 @ 59. 6 measurements. This pair is an occultation double. The primary
is an infra-red source.
Observations:
C8 at 104x. You need averted vision to pick up B.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 54.3 inches.
Separation: AB = 54.3 miles.
Distance (LY): 494
Total luminosity (Suns): 149
Barton 2392
Rating: 5 M
HD 75509; SAO 98165
Position: 0851+1802
A
B
Magnitude
8.21
9.30
Separation PA
—
—
1.0 102 +
Year
—
1986
Spectra
K5
Colors
Y
?
Notes:
1895: 4.2 @ 87. 3 measurements.
Observations:
C8 at 104x. A 7m W star lies 12 min NE. I estimate the magnitudes at closer to 10.5
and 10.8.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 34.8 inches.
Separation: AB = 1,426 feet.
Distance (LY): 179
Total luminosity (Suns): 1
- 17 -
Zone 138
Difficult
h4135
Rating: 5 D
HD 75035; SAO 98133
Position: 0848+1724
A
B
Magnitude
7.22
13.83
Separation PA
—
—
42.2
53
Year
—
1904
Spectra
K2
Colors
Y
?
Notes:
1 measurement.
Observations:
C8 at 83x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 25.5 inches.
Separation: AB = 65.2 miles.
Distance (LY): 990
Total luminosity (Suns): 100.69
Deep Sky Objects
Difficult
NGC 2672
Other Names: H II 48; UGC 4619; H II 80
Rating: 5 D
Position: 0849+1904
Type: Gal
Surface brightness: 13.9
Class: E1
Dimensions: 24"
Magnitude: 12.6
Notes:
This galaxy produced supernova 1938B.
Observations:
C8 at 206x. The faintest of smudges of light! It is very small and almost stellar.
- 18 -
Zone 138
Model (where the Sun is a baseball):
Its diameter would be 9.5 million miles.
Distance (LY): 254,000,000
Radial velocity (km/sec): +4,100
Luminosity (suns): 46,100,000,000
Zone 138, Map 5
Double Stars
Easy
South 571
Bur 584; ADS 6915; HD 73618; SAO 98013
Position: 0840+1933
A
B
C
D
Magnitude
7.30
11.90
7.20
6.74
Separation
—
1.2 45.0 91.6 -
PA
—
291 =
157 +
242 +
Rating: 2 E
Year
—
1962
1983
1997
Spectra
F0 III
Colors
W
No
W
K0 III
Notes:
AB 1878: 1.6 @ 291. 8 measurements. The stars share common proper motion.
AC 1825: 45.2 @ 156. 19 measurements. Spectroscopic binary.
AD 1825: 92.9 @ 241. 22 measurements. Variable.
Dd (9.79m) 1986: 0.5 @ 226. 1997: 0.5 @ 232. 10 measurements.
Observations:
C8 at 104x. Very, very rich and bright field.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 23.7 inches; D = 22.3 inches.
Separation: AB = 1,901feet; AC = 13.8 miles; AD = 28.0 miles; Dd = 807 feet
Distance (LY): 196
Total luminosity (Suns): 13.5
- 19 -
Zone 138
STF 1254
CD = South 572; ADS 6921; HD 73710; SAO 98021
Position: 0840+1940
A
B
C
D
Magnitude
6.44
10.37
8.60
9.39
Separation
—
20.9 +
63.9 +
83.1 +
PA
—
55 +
343 +
43 -
Rating: 2 E
Year
—
1999
1999
1999
Spectra
K0 III
G0 I
Colors
Y
W
?
?
Notes:
AB 1831: 20.5 @ 54. 23 measurements. Star A is a spectroscopic binary.
AC 1863: 63.4 @ 342. 21 measurements.
AD 1863: 82.5 @ 44. 17 measurements.
Observations:
C8 at 83x. It lies in the open cluster M44. Very rich field. Webb saw them as Y! and
?. Eddy O'Connor (Terara, NSW, Australia; 12" Dob)— Y, ?, ?.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 46.2 inches; B = 19.2inches.
Separation: AB = 24.8 miles; AC = 75.8 miles; AD = 98.6 miles.
Distance (LY): 760
Total luminosity (Suns): 165
South 570
Rating: 3 E
HD 73449; SAO 97999
Position: 0839+1941
A
B
C
Magnitude
7.45
9.40
9.50
Separation
—
57.4 178
PA
—
84 =
345
Year
—
1979
1825
Spectra
F0
Colors
W
W
W
Notes:
AB 1825: 57.5 @ 84. 6 measurements. The stars have a small difference in proper
motion.
AC 1 measurement.
Observations:
C8 at 104x. It is in the open cluster M44.
- 20 -
Zone 138
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 10.1 inches.
Separation: AB = 21.3 miles; AC = 66.1 miles.
Distance (LY): 238
Total luminosity (Suns): 6
Epsilon Cnc
41 Cnc; South 574; HD 73731; SAO 98024
Position: 0840+1933
A
B
Magnitude
6.30
7.40
Separation PA
—
—
134.9 +
250 +
Rating: 3 E
Year
—
1924
Spectra
A2m
A0
Colors
W
W
Notes:
1825: 132.8 @ 249. 3 measurements.
A spectroscopic binary.
The stars share common proper motion.
Observations:
C8 at 104x. It lies in the open cluster M44.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 6.26 inches; B = 5.89 inches.
Separation: AB = 116 miles.
Distance (LY): 550
Total luminosity (Suns): 96
STF 1249 rej
Rating: 5 E
HD 73174; SAO 97973
Position: 0838+1944
A
B
Magnitude
7.80
9.50
Separation PA
—
—
25.3 +
40 =
Notes:
1905: 25.0 @ 40. 2 measurements.
- 21 -
Year
—
1984
Spectra
Colors
W
W
Zone 138
Observations:
C8 at 104x. It is blasted away by an 8m star just 2 min S.
Soulie 339
Position: 0845+2012
A
B
Magnitude
10.26
10.40
Rating: 5 E
Separation PA
—
—
6.9
120
Year
—
1984
Spectra
Colors
Y
Y
Notes:
1 measurement.
Observations:
C11 at 98x.
Distance (LY): 10,900
Total luminosity (Suns): 1,370
Moderate
Soulie 336
Rating: 5 M
HD 73993; SAO 80362
Position: 0842+2010
A
B
Magnitude
8.53
11.10
Separation PA
—
—
31.5
328
Year
—
1984
Notes:
1 measurement.
Observations:
C11 at 98x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 5.10 inches.
Separation: AB = 20.3 miles.
Distance (LY): 412
Total luminosity (Suns): 5.62
- 22 -
Spectra
F2 Vn
Colors
W
?
Zone 138
Deep Sky Objects
Easy
NGC 2632
Rating: 2 E
Other Names: Melotte 88; Collinder 189; Raab 75; Beehive Cluster; Praesepe, M44
Astronomical Leage Program: Messier Club, Urban Deep Sky Club
Position: 0840+1959
Type: Oc
Dimensions: 95'
Class: II 3m
Cluster population: 200
Magnitude: 3.1
Notes:
Known to Aratus (260 BC), Hipparchus (130 BC), Ptolemy, Al-Sufi, Ulugh-Begh,
Tycho Brahe, Bayer, Hevelius, Flamsteed, Cassini, and De Cheseaux, Messier added it to
his list on March 4, 1769.
According to Pliny, it was used to predict the weather: if the cluster was invisible on
an otherwise clear night, it meant a violent storm was coming. Galileo discovered its true
nature as a star cluster in 1610 when he turned his primitive refractor on it.
It is 40 light years in diameter.
The brightest star, Epsilon Cnc, is an A6 star about 70 times brighter than the Sun and
shines at 6.3m. (At this distance, the Sun would be 10.9m.) Altogether, about 100 of the
cluster’s stars are brighter than the Sun.
This cluster is 660 million years old and the earliest star types are A0. Most of the
stars are Main Sequence types, and there are 4 orange giants (type K0III) and at least 5
white dwarfs. There are 9 magnetic variables in this group, which lies 28,000 light years
from the galaxy’s center and 275 light years above its plane.
It is about the same age as the Hyades.
Observations:
C8 at 32x. Even with a telecompressor, it overflowed the field! Lots of W and B
stars, with many interesting "groupings". Note the 6.5m trapezoid at the center, and the
triangle 5 min W. In the S end lie the doubles South 570, South 571, Bur 584, Epsilon
Cnc, and STF 1254. One of the Webb Society observers reports seeing a greenish star
near the center, but I cannot verify this. Hartung notes three bright triangles, one with "a
fine orange star with less bright wide reddish companion Nf."
Model (where the Sun is a baseball):
Its diameter would be 4,720 miles with its stars 430 miles apart.
- 23 -
Zone 138
Distance (LY): 530
Luminosity (suns): 1,300
NGC 2632 (M44, The Beehive)
Open cluster (II 3 m, 200 stars)
Observed with C8 on 2/1/92; s7, t6
Magnification: 40x
- 24 -
Zone 138
Zone 138 Mini-Catalog
Double Stars
Designation
Position
Rating
Map
Upsilon 1 Cnc
0827+2432
1E
1
STF 1173
0802+1657
2E
2
OS 191 rej
0825+2009
2E
1
STF 1227
0827+2309
2E
1
South 571
0840+1933
2E
5
STF 1254
0840+1940
2E
5
STF 1220
0826+2421
3E
1
South 570
0839+1941
3E
5
Epsilon Cnc
0840+1933
3E
5
STF 1262
0842+2348
3E
3
Bur 1243
0814+1741
4E
2
Hough 524
0816+1841
4E
2
STF 1230
0828+1651
4E
2
h2451
0834+2238
4E
3
Gamma Cnc
0843+2128
4E
3
Couteau 91
0808+2106
5E
1
STF 1191
0811+1902
5E
2
h444
0818+1937
5E
2
h448
0828+2128
5E
1
STF 1249 rej
0838+1944
5E
5
Component
A
B
A
B
A
B
A
B
A
B
C
D
A
B
C
D
A
B
A
B
C
A
B
A
B
A
B
C
D
A
B
C
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
- 25 -
Mag
6.51
7.38
8.42
10.06
7.34
8.72
8.06
9.79
7.30
11.90
7.20
6.74
6.44
10.37
8.60
9.39
8.57
10.24
7.45
9.40
9.50
6.30
7.40
8.31
10.45
6.47
12.30
9.20
8.00
7.54
10.50
10.90
9.20
10.39
9.61
10.60
4.66
10.19
9.41
11.09
9.94
10.80
8.44
10.08
9.01
11.66
7.80
9.50
Separation
—
5.4 —
10.5 +
—
37.5 —
25.0 +
—
1.2 45.0 91.6 —
20.9 +
63.9 +
83.1 +
—
29.2 —
57.4 178
—
134.9 +
—
7.0 +
—
1.5 +
63.0 232.2
—
4.4 +
40.0
—
33.5 +
—
19.2 —
114.3 +
—
10.6 +
—
3.5 +
—
37.1 +
—
31.3 —
25.3 +
PA
—
50 +
—
52 +
—
191 =
—
163 =
—
291 =
45.0 91.6 —
55 +
63.9 +
83.1 +
—
214 +
—
84 =
178
—
250 +
—
201 —
332 63.0 232.2
—
344 =
40.0
—
187 —
185 +
—
67 +
—
148 —
76 +
—
96 —
324 —
40 =
Zone 138
Designation
Position
Rating
Map
Soulie 339
0845+2012
5E
5
STF 1269
0846+1915
5E
4
STF 1285
0851+2053
5E
3
STF 1218
0824+2311
4M
1
Theta Cnc
0832+1806
4M
4
Barton 2390
0837+2210
4M
3
STF 1214
0820+1700
5M
2
Soulie 336
0842+2010
5M
5
Barton 2392
0851+1802
5M
4
Zeta Cnc
0812+1739
1D
2
STF 1171
0801+2335
5D
1
h2423
0801+1935
5D
2
h4135
0848+1724
5D
4
Component
A
B
A
B
A
B
A
B
A
B
A
B
A
B
C
A
B
A
B
A
B
C
D
A
B
A
B
C
A
B
Mag
10.26
10.40
9.78
10.10
10.23
10.91
9.50
11.00
5.35
10.00
8.32
12.77
10.63
11.00
12.20
8.53
11.10
8.21
9.30
5.67
5.86
6.30
9.70
6.51
9.95
8.65
12.60
11.75
7.22
13.83
Separation
—
6.9
—
11.5 =
—
25.8 —
4.2 —
70.4 +!
—
4.5 —
4.9 +
0.6 +
—
31.5
—
1.0 —
0.8 6.4 +
280.3 —
2.1 —
5.6 +
61.4
—
42.2
PA
—
120
—
309 +?
—
339 —
268 —
62 +
—
83 +
—
0=
0.6 +
—
328
—
102 +
—
83 +
6.4 +
280.3 —
326 —
263 =
61.4
—
53
Deep Sky Objects
Object
NGC 2632
NGC 2507
NGC 2498
NGC 2577
NGC 2512
NGC 2672
Position
0840+1959
0802+1543
0800+2459
0823+2233
0803+2324
0849+1904
Rating
2E
5M
4D
4D
5D
5D
Map
5
2
1
1
1
4
Type
Oc (II 3m)
Gal (S0/a pec)
Gal (SBa)
Gal (S0-:)
Gal (SBb)
Gal (E1)
- 26 -
Specifications
Surface
Mag
Br
3.1
12.2
13.1
13.4
13.1
12.4
13.0
13.1
13.1
12.6
13.9
Population
200