Zone 245, Master Map
Normal View
-14°00'
Zone Master, Normal View, 10 deg FOV
-16°00'
Scutum
υ
ρ1
c
-18°00'
e
-20°00'
ρ2
ξ1
π
ξ2
f
d
-22°00'
ο
ν2
ν1
-24°00'
χ3
χ1
ψ
Sagittarius
20h 00m
19h 52m
19h 44m
19h 36m
19h 28m
19h 20m
19h 12m
19h 04m
18h 56m
Zone 245, Map 1
Normal Image
-15°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
Leonard 25
Jonckheere 1664
h2863
h5507
Hough 272
ρ1 Rho Sgr
h2866
South 710
Ruprecht 147
-17°00'
South 715
NGC 6774
Howe 97
h1367
Hipparcos 2714
-18°00'
υ
-16°00'
South 716
Bur 422
H V 77
H VI 120
h5082
-19°00'
ρ2
h2853
19h 30m
19h 25m
19h 20m
19h 15m
19h 10m
19h 05m
19h 00m
Zone 245, Map 1
Mirror Image
-15°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
Leonard 25
Jonckheere 1664
h2863
h5507
NGC 6774
South 710
υ
-17°00'
Ruprecht 147
Hough 272
Howe 97
ρ1
Bur 422
Rho Sgr
h2866
-18°00'
Hipparcos 2714
h1367
South 715
-16°00'
South 716
H V 77
H VI 120
h5082
-19°00'
ρ2
h2853
19h 00m
19h 05m
19h 10m
19h 15m
19h 20m
19h 25m
19h 30m
Zone 245, Map 2
Normal Image
-20°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
-21°00'
h2853
Pi Sgrπ
Aravamudan 1564
H N 126
-22°00'
ο
NGC 6793
-24°00'
-23°00'
H N 129
χ3
Bos 426
χ1
19h 30m
Chi 1 Sgr
19h 25m
Cordoba 230
19h 20m
19h 15m
19h 10m
19h 05m
19h 00m
Zone 245, Map 2
Mirror Image
-20°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
π
-21°00'
h2853
Pi Sgr
Aravamudan 1564
H N 126
-22°00'
ο
NGC 6793
-24°00'
-23°00'
H N 129
χ3
Bos 426
χ1 Chi 1 Sgr
Cordoba 230
19h 00m
19h 05m
19h 10m
19h 15m
19h 20m
19h 25m
19h 30m
Zone 245, Map 3
Normal Image
-15°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
-16°00'
Hipparcos 2824
55 Sgr
h2880
54 Sgr
Aravamudan 300
-17°00'
South 722
-18°00'
h2912
-19°00'
h5128
20h 00m
19h 55m
19h 50m
19h 45m
19h 40m
19h 35m
19h 30m
Zone 245, Map 3
Mirror Image
-16°00'
Hipparcos 2824
55 Sgr
h2880
-15°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
Aravamudan 300
-18°00'
South 722
-17°00'
54 Sgr
-19°00'
h5128
19h 30m
19h 35m
19h 40m
19h 45m
19h 50m
19h 55m
20h 00m
Zone 245, Map 4
Normal Image
h2875
h2902
Bur 467
-21°00'
-20°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
-22°00'
h2883
-23°00'
LDS 697
PK 17-21.1
See 384
Bos 446
See 400
20h 00m
-24°00'
See 396
h2904
19h 55m
19h 50m
19h 45m
19h 40m
19h 35m
19h 30m
Zone 245, Map 4
Mirror Image
-20°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
-21°00'
h2875
h2902
Bur 467
h2883
-23°00'
-22°00'
LDS 697
PK 17-21.1
Bos 446
See 384
-24°00'
See 396
h2904
19h 30m
19h 35m
19h 40m
19h 45m
19h 50m
19h 55m
20h 00m
Zone 245
4 Reference Stars, 35 Double Stars,
1 Planetary Nebula, 3 Open Clusters
Flamsteed
h5082 ..................................................... 3
h5128 ................................................... 17
h5507 ..................................................... 8
Hipparcos 2714 ...................................... 9
Hough 272.............................................. 9
Howe 97................................................. 8
54 Sgr................................................... 18
55 Sgr................................................... 16
A
Aravamudan 1564................................ 14
Aravamudan 300.................................. 18
J
B
Jonckheere 1664 .................................... 7
Bos 426 ................................................ 13
Bos 446 ................................................ 20
Bur 422 .................................................. 6
Bur 467 ................................................ 23
L
LDS 697............................................... 21
N
C
NGC 6774 ............................................ 11
NGC 6793 ............................................ 15
Chi 1 Sgr.............................................. 12
Cordoba 230 ........................................ 13
P
H
Pi Sgr.................................................... 12
PK 17-21.1 ........................................... 24
H N 126 ............................................... 14
H N 129 ............................................... 12
H V 77 ................................................... 6
H VI 120 ................................................ 5
h1367 ..................................................... 5
h2853 ................................................... 10
h2863 ..................................................... 7
h2866 ..................................................... 2
h2875 ................................................... 19
h2880 ................................................... 16
h2883 ................................................... 20
h2902 ................................................... 19
h2904 ................................................... 22
R
Rho Sgr .................................................. 2
Ruprecht 147........................................ 11
S
See 384................................................. 22
See 396................................................. 21
South 710 ............................................... 4
South 715 ............................................... 3
South 716 ............................................... 4
South 722 ............................................. 17
-1-
Zone 245
Zone 245, Map 1
Reference Star
Rho Sgr (44 Sgr; HD 181577; SAO 162512)
Position: 1922-1751
Mag : 3.92
Spectrum : F0 IV
Color : W
Assumed distance: 122 light years
Assumed luminosity (suns): 32
Notes:
The star is a possible member of the Eggen group, and is a Delta Scuti variable.
Double Stars
Easy
h2866
Rating: 2 E
SAO 162556
Position: 1923-1800
A
B
C
Magnitude
9.27
9.30
8.77
Separation
—
23.4 35.0 +
PA
—
54 =
283 +
Year
—
1988
1980
Spectra
A2
Colors
W
No
W
Notes:
AB 1877: 23.5 @ 54. 11 measurements.
AC 1880: 34.8 @ 278. 7 measurements.
There are four more very faint comes (all discovered by Abt).
Observations:
C8 at 104x. An 8.5m star is 30" @ 310; it forms a neat little triangle with this pair.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 7.60 inches.
Separation: AB = 28.5 miles; AC = 42.6 miles.
Distance (LY): 780
Total luminosity (Suns): 30
-2-
Zone 245
h5082
Rating: 3 E
ADS 11972; HD 176884; SAO 162130
Position: 1903-1915
A
B
C
D
Magnitude
5.96
9.14
11.76
13.50
Separation
—
7.5 +
20.4 +
25.9
PA
—
89 =
113 +
261
Year
—
1991
1963
1958
Spectra
K0 III
Colors
Y
B
R
No
Notes:
AB 1877: 7.4 @ 89. 18 measurements.
AC 1877: 19.8 @ 112. 11 measurements.
AD 1 measurement.
Observations:
C8 at 83x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 46.2 inches.
Separation: AB = 17.3 miles; AC = 47.1 miles; AD = 59.8 miles.
Distance (LY): 1,480
Total luminosity (Suns): 736
South 715
Rating: 3 E
ADS 12266; HD 180562; SAO 162417
Position: 1918-1558
A
B
Magnitude
6.62
7.43
Separation PA
—
—
8.4 =
16 =
Notes:
1825: 8.4 @ 16. 40 measurements.
Observations:
C8 at 83x.
-3-
Year
—
1994
Spectra
A3 V
Colors
Y
B
Zone 245
South 716
Rating: 3 E
ADS 12271; HD 180695
Position: 1918-1557
A
B
Magnitude
7.81
8.09
Separation PA
—
—
5.3 +
194 -
Year
—
1994
Spectra
B9.5 V
Colors
W
B
Notes:
1825: 4.9 @ 196. 36 measurements.
Observations:
C8 at 83x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 9.60 inches.
Separation: AB = 5.54 miles.
Distance (LY): 670
Total luminosity (Suns): 43
South 710
Rating: 4 E
ADS 12039; HD 177817; SAO 162201
Position: 1907-1614
A
B
Magnitude
5.90
8.42
Separation PA
—
—
6.4 =
0-
Year
—
1991
Notes:
1825: 6.4 @ 2. 16 measurements.
Observations:
C8 at 83x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 10.8 inches.
Separation: AB = 8.88 miles.
Distance (LY): 890
Total luminosity (Suns): 287
-4-
Spectra
B7 IV
Colors
bW
O?
Zone 245
H VI 120
Bur 1467; HD 181558; SAO 162511
Rating: 4 E
Position: 1922-1914
A
B
Magnitude
6.27
9.90
Separation PA
—
—
90.5 309 +
Year
—
1916
Spectra
B5 V
Colors
W
W
Notes:
1899: 91.0 @ 308. 2 measurements.
Observations:
C8 at 104x. Moderate field.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 11.4 inches.
Separation: AB = 96.0 miles.
Distance (LY): 680
Total luminosity (Suns): 114
h1367
Rating: 5 E
SAO 162285
Position: 1911-1726
A
B
C
Magnitude
8.84
10.17
12.81
Separation
—
13.9 =
25.9 +
PA
—
63 =
292 -
Year
—
1991
1988
Spectra
F2 V
Colors
W
O
?
Notes:
AB 1877: 13.9 @ 63. 11 measurements.
AC 1906: 25.4 @ 294. 2 measurements.
Hipparcos/Tycho mission data show different distances for these stars; they may be
optical.
There are four more faint comes.
Observations:
C8 at 104x.
-5-
Zone 245
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 5.10 inches.
Separation: AB = 6.48 miles; AC = 12.1 miles.
Distance (LY): 299
Total luminosity (Suns): 2.8
Bur 422
Rating: 5 E
ADS 12191; HD 179767; SAO 162351
Position: 1915-1804
A
B
Magnitude
8.27
12.10
Separation PA
—
—
12.2 39 -
Year
—
1929
Spectra
F2 V
Colors
W
?
Notes:
AB 1891: 12.3 @ 44. 5 measurements.
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 5.10 inches.
Separation: AB = 6.98 miles.
Distance (LY): 367
Total luminosity (Suns): 3.15
H V 77
Rating: 5 E
HD 180699; SAO 162432
Position: 1918-1852
A
B
Magnitude
6.80
10.30
Separation PA
—
—
39.6 159 =
Notes:
1783: 39.7 @ 159. 3 measurements.
-6-
Year
—
1900
Spectra
B5 V
Colors
W
B
Zone 245
Observations:
C8 at 83x. Very bright but moderate field.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 11.4 inches.
Separation: AB = 210 miles.
Distance (LY): 3,400
Total luminosity (Suns): 1,570
h2863
Rating: 5 E
HD 180928; SAO 162462
Position: 1919-1532
A
B
Magnitude
6.09
12.95
Separation PA
—
—
48.6 +
18 +
Year
—
1909
Spectra
K2 III
Colors
O!!
B
Notes:
1900: 45.8 @ 16. 2 measurements.
The primary is an infra-red source.
Observations:
C8 at 83x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 49.5 inches.
Separation: AB = 39.4 miles.
Distance (LY): 520
Total luminosity (Suns): 80.13
Jonckheere 1664
Rating: 4 M
HD 176746; SAO 162115
Position: 1903-1532
A
B
Magnitude
9.19
12.00
Separation PA
—
—
5.0
270
-7-
Year
—
1941
Spectra
Colors
O
R
Zone 245
Notes:
1 measurement.
Observations:
C8 at 104x.
Moderate
Howe 97
Rating: 4 M
HD 179853; SAO 162361
Position: 1915-1721
A
B
Magnitude
7.53
11.07
Separation PA
—
—
26.2 75 -
Year
—
1982
Spectra
A2 V
Colors
yW
O
Notes:
1878: 27.9 @ 78. 4 measurements.
Observations:
C8 at 83x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 8.40 inches.
Separation: AB = 31.9 miles.
Distance (LY): 780
Total luminosity (Suns): 52
h5507
Rating: 5 M
HD 177517; SAO 162177
Position: 1906-1540
A
B
Magnitude
5.93
12.37
Separation PA
—
—
46.9
63
Year
—
1900
Notes:
1 measurement.
-8-
Spectra
B8 V
Colors
W
?
Zone 245
Star A is a spectroscopic binary.
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 10.2 inches.
Separation: AB = 63.7 miles.
Distance (LY): 870
Total luminosity (Suns): 260.65
Hipparcos 2714
Rating: 5 M
HD 178316
Position: 1909-1716
A
B
Magnitude
10.39
12.35
Separation PA
—
—
14.5
244
Year
—
1991
Spectra
Colors
W
W
Notes:
1 measurement.
Observations:
C11 at 140x.
Hough 272
Rating: 5 M
ADS 12337; HD 181576; SAO 162516
Position: 1922-1715
A
B
C
Magnitude
7.38
11.90
12.40
Separation
—
12.3 +
4.9
PA
—
52 +
301
Notes:
AB 1888: 6.7 @ 38. 8 measurements.
AC 1 measurement.
-9-
Year
—
1959
1897
Spectra
F6 V
Colors
W
?
?
Zone 245
Observations:
C8 at 83x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 4.20 inches.
Separation: AB = 4.70 miles; AC = 1.87 miles.
Distance (LY): 245
Total luminosity (Suns): 5.4
Difficult
h2853
Rating: 5 D
HD 177819; SAO 187689
Position: 1907-2000
A
B
Magnitude
8.77
11.06
Separation PA
—
—
15.1 +
88 -
Year
—
1991
Spectra
G0 III
Colors
Y
W?
Notes:
1830: 12.0 @ 100. 7 measurements.
Hipparcos/Tycho mission data show different distances for these stars (12,500 and
1,100 light years); they may be optical.
Observations:
C8 at 104x.
- 10 -
Zone 245
Deep Sky Objects
Easy
Ruprecht 147
Position: 1917-1617
Type: OC
Dimensions: 48'
Rating: 2 E
Class: III 2 m
Cluster population: 20
Magnitude: 9.0
Notes:
This cluster may be 2.5 billion years old.
Observations:
C11 at 98x. Lage and very bright group with a wide spread in magnitudes. I counted
63 stars (many of them obviously field stars). A nice O star lies in the S end.
Distance (LY): 570
Total luminosity (Suns): 6
Difficult
NGC 6774
Position: 1917-1600
Type: Oc
Dimensions: 25'
Rating: 5 D
Class: III 2m
Magnitude: 12.0
Observations:
C8 at 65x. A faint and sparse group; dismal. The brightest star is a very close double.
- 11 -
Zone 245
Zone 245, Map 2
Reference Stars
Pi Sgr (41 Sgr; Albaldah; HD 178524; SAO 187756)
Position: 1910-2101
Mag : 2.88
Spectrum : F2 III
Color : W
Assumed distance: 440 light years
Assumed luminosity (suns): 1,070
Notes:
This star is an infra-red source and is a member of the Pleiades group.
Chi 1 Sgr (47 Sgr; Finsen 327; HD 182369; SAO 188101)
Position: 1925-2430
Mag : 5.01
Spectrum : Am
Color : W
Assumed distance: 221 light years
Assumed luminosity (suns): 38
Notes:
This star is an extremely close binary with a 10.8 year orbit (Finsen, 1965) and is a
member of the Hyades group.
Double Stars
Easy
H N 129
Rating: 3 E
ADS 11987; HD 177120; SAO 187632
Position: 1904-2254
A
B
Magnitude
6.73
8.92
Separation PA
—
—
8.0 308 +
Notes:
1867: 8.1 @ 306. 21 measurements.
- 12 -
Year
—
1991
Spectra
A0
Colors
W
R
Zone 245
Observations:
C8 at 83x.
Bos 426
Rating: 3 E
ADS 12046
Position: 1908-2407
A
B
Magnitude
9.34
9.60
Separation PA
—
—
5.8 113 +
Year
—
1968
Spectra
G0 V
Colors
Y
wO
Notes:
1912: 6.9 @ 108. 6 measurements.
Observations:
C8 at 104x. A 10m right triangle is just to the W.
Moderate field.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 3.45 inches.
Separation: AB = 3,907 feet.
Distance (LY): 82
Total luminosity (Suns): 0.18
Cordoba 230
Rating: 4 E
ADS 11921; HD 176365
Position: 1901-2440
A
B
Magnitude
8.21
9.92
Separation PA
—
—
8.7 195 +
Notes:
AB 1910: 9.2 @ 194. 11 measurements.
Observations:
C8 at 104x.
- 13 -
Year
—
1991
Spectra
A0 V
Colors
W
W?
Zone 245
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 9.00 inches.
Separation: AB = 1.88 miles.
Distance (LY): 139
Total luminosity (Suns): 0.4
Aravamudan 1564
Rating: 5 E
Position: 1910-2118
A
B
Magnitude
9.19
12.40
Separation PA
—
—
14.4
146
Year
—
1921
Spectra
A5 IV
Colors
W
?
Notes:
1 measurement.
Observations:
C11 at 98x. It is the west-most star in a 3-star chain.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 9.15 inches.
Separation: AB = 5.86 miles.
Distance (LY): 261
Total luminosity (Suns): 1.17
Difficult
H N 126
Rating: 4 D
ADS 11989; HD 177166; SAO 187634
Position: 1904-2132
A
B
Magnitude
7.18
7.43
Separation PA
—
—
1.2 +
8 -!
Year
—
1999
Spectra
F8 V
Colors
W
W
Notes:
1873: 1.0 @ 40. 97 measurements.
Orbit calculated; Period is 356years, semi-major axis of 1.37", retrograde motion.
- 14 -
Zone 245
Observations:
C8 at 516x. Notched.
C11 at 634x. I got a peanut image on a night of marginal seeing.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 3.60 inches.
Separation: AB = 1,742 feet.
Distance (LY): 177
Total luminosity (Suns): 5.92
Deep Sky Objects
Moderate
NGC 6793
Other Names: H VIII 81
Astronomical League Program: Herschel II Club
Rating: 5 M
Position: 1922-2208
Type: Oc
Cluster population: 23
Class: III 2p
Dimensions: 6'
Notes:
The cluster may be 437 million years old.
Observations:
C8 at 83x. Sparse; a Y star dominates. Note the triangle of 10m stars at the center.
Distance (LY): 3,590
- 15 -
Zone 245
Zone 245, Map 3
Reference Star
55 Sgr (HD 186005; SAO 162915)
Position: 1943-1607
Mag : 5.05
Assumed distance: 175 light years
Spectrum : F1 III
Color : W
Assumed luminosity (suns): 22
Notes:
This star is a spectroscopic binary and rotates at 134 kps.
Double Stars
Easy
h2880
Rating: 2 E
ADS 12595
Position: 1934-1617
A
B
Magnitude
7.82
8.17
Separation PA
—
—
4.5 +
149 -
Year
—
1995
Notes:
1889: 3.6 @ 151. 14 measurements.
Observations:
C8 at 104x. It lies 1 minN of AQ Agr, a deep rO star.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 2.40 inches.
Separation: AB = 21.8 miles.
Distance (LY): 3,100
Total luminosity (Suns): 1,000
- 16 -
Spectra
K1 III
Colors
yW
yW
Zone 245
South 722
Rating: 2 E
ADS 12728; HD 185344; SAO 162853
Position: 1939-1654
A
B
Magnitude
7.32
7.45
Separation PA
—
—
100 236 =
Year
—
1991
Spectra
A7 III
F2 III
Colors
W
B
Notes:
1825: 10.2 @ 236. 28 measurements. The stars have different proper motions.
Observations:
C8 at 83x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 7.20 inches; B = 11.3 inches.
Separation: AB = 60.5 miles.
Distance (LY): 388
Total luminosity (Suns): 26
h5128
Rating: 3 E
ADS 12588; HD 184119; SAO 162753
Position: 1933-1837
A
B
C
BC
Magnitude
8.30
9.98
11.40
Separation PA
—
—
21.1 =
111 =
4.1 -
134 +
Year
—
1991
Spectra
A5 V
Colors
W
Y
No
1918
Notes:
AB 1879: 21.1 @ 111. 8 measurements. Hipparcos/Tycho mission data show
different distances for these stars (447 and 84 light years); they may be optical. The stars
have different proper motions.
BC 1901: 4.2 @ 126. 7 measurements.
Observations:
C8 at 104x.
- 17 -
Zone 245
54 Sgr
h599; ADS 12767; HD 185644; SAO 162883
Rating: 3 E
Position: 1941-1618
A
B
C
Magnitude
5.31
12.64
7.65
Separation
—
38.0 +
45.6 -
PA
—
274 +
42 =
Year
—
1903
1991
Spectra
K2 III
F8 V
Colors
Y
?
B
Notes:
AB 1878: 35.8 @ 273. 2 measurements. Star A is an eclipsing and occultation
binary and an infra-red source.
AC 1845: 45.8 @ 42. 21 measurements.
Observations:
C8 at 104x. Rich field.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 49.5 inches; B = 18.8 inches.
Separation: AB = 14.5 miles; AC = 17.4 miles.
Distance (LY): 245
Total luminosity (Suns): 34.4
Moderate
Aravamudan 300
Rating: 4 M
HD 187801; SAO 163066
Position: 1952-1653
A
B
Magnitude
7.70
11.60
Separation PA
—
—
14.2
358
Notes:
1 measurement.
Observations:
C8 at 83x.
- 18 -
Year
—
1917
Spectra
K0
Colors
O
B!
Zone 245
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 23.8 inches.
Separation: AB = 173 miles.
Distance (LY): 7,800
Total luminosity (Suns): 3,510
Zone 245, Map 4
Double Stars
Easy
h2875
Rossiter 5548 (B); ADS 12539; HD 183696; SAO 188239
Rating: 4 E
Position: 1932-2053
A
B
C
Magnitude
9.50
12.00
10.63
Separation
—
0.7
10.3 +
PA
—
284
332 =
Year
—
1951
1991
Spectra
F8/G0 V
Colors
W
No
W
Notes:
AB: 1 measurement.
AC 1828: 5.0 @ 332. 13 measurements.
Observations:
C11 at 98x.
h2902
Position: 1953-2126
A
B
Magnitude
9.16
10.33
Rating: 4 E
Separation PA
—
—
16.3 +
31 -?
- 19 -
Year
—
1991
Spectra
F5 V
Colors
W
W
Zone 245
Notes:
1831: 15.0 @ 214. 5 measurements. Quadrant reversal?
Observations:
C11 at 98x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 4.35 inches.
Separation: AB = 1.55 miles.
Distance (LY): 61
Total luminosity (Suns): 0.083
h2883
Rating: 5 E
ADS 12665; HD 184836; SAO 188349
Position: 1937-2137
A
B
Magnitude
8.32
11.53
Separation PA
—
—
28
300
Year
—
1943
Spectra
K2
Colors
Y
bW
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 27.4 inches.
Separation: AB = 21.8 miles.
Distance (LY): 500
Total luminosity (Suns): 10.49
Bos 446
Rating: 5 E
ADS 12863; HD 186480
Position: 1946-2319
A
B
C
Magnitude
10.20
14.20
10.94
Separation
—
3.1
28.9 +
PA
—
250
163 -
- 20 -
Year
—
1926
1991
Spectra
A5 III/IV
Colors
W
No
W
Zone 245
Notes:
AB 1 measurement.
AC 1926: 28.1 @ 166. 2 measurements.
Observations:
C11 at 98x.
See 396
Rating: 5 E
ADS 12977; HD 187248
Position: 1950-2343
A
B
Magnitude
8.40
10.60
Separation PA
—
—
6.7 271 =
Year
—
1991
Spectra
A0 IV/V
Colors
W
W
Notes:
1897: 7.0 @ 271. 9 measurements.
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 11.7 inches.
Separation: AB = 2.84 miles.
Distance (LY): 272
Total luminosity (Suns): 2.8
LDS 697
Rating: 5 E
HD 189117; SAO 188789
Position: 1959-2155
A
B
Magnitude
8.19
10.57
Separation PA
—
—
41.7 315 =
Notes:
1921: 41.8 @ 315. 4 measurements.
- 21 -
Year
—
1991
Spectra
G0 V
Colors
Y
W
Zone 245
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 3.45 inches.
Separation: AB = 10.8 miles.
Distance (LY): 166
Total luminosity (Suns): 1.2
Moderate
h2904
Rating: 4 M
ADS 13072; HD 188088
Position: 1954-2356
A
B
Magnitude
6.18
10.30
Separation PA
—
—
38.9 +! 40 -!!
Year
—
1985
Spectra
K3 IV
Colors
Y
bW
Notes:
1830: 20.0 @ 174. 25 measurements.
A is a spectroscopic binary.
Observations:
C8 at 104x with mask.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 51.3 inches.
Separation: AB = 2.81 miles.
Distance (LY): 46.4
Total luminosity (Suns): 0
See 384
Rating: 5 M
ADS 12625; HD 184494; SAO 188318
Position: 1936-2319
A
B
Magnitude
7.90
10.30
Separation PA
—
—
5.2 175 +
- 22 -
Year
—
1967
Spectra
A9 V
Colors
W
?
Zone 245
Notes:
1897: 6.1 @ 167. 11 measurements.
Observations:
C8 at 206x.
Bur 467
Rating: 5 M
ADS 12887; HD 186666; SAO 188551
Position: 1947-2131
A
B
Magnitude
7.55
10.46
Separation PA
—
—
3.3 +
133 -
Year
—
1991
Notes:
AB 1877: 1.8 @ 140. 15 measurements.
Observations:
C8 at 206x. Moderate field.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 7.90 inches.
Separation: AB = 1.44 miles.
Distance (LY): 280
Total luminosity (Suns): 6.47
- 23 -
Spectra
A5
Colors
Y
?
Zone 245
Deep Sky Objects
Difficult
PK 17-21.1
Other Names: Abell 65
Rating: 5 D
Position: 1947-2308
Type: Pn
Dimensions: 134'' x 74''
Class: 2a
Magnitude: 13.1
Notes:
The central star is 15.9m.
Observations:
C8 at 104x. It is an extremely faint and featureless ball of foggy light seen only with
averted vision and tube movement.
Distance (LY): 5,700
Total luminosity (Suns): 15
- 24 -
Zone 245
Zone 245 Mini-Catalog
Double Stars
Designation
Position
Rating
Map
h2866
1923-1800
2E
1
h2880
1934-1617
2E
3
South 722
1939-1654
2E
3
h5082
1903-1915
3E
1
H N 129
1904-2254
3E
2
Bos 426
1908-2407
3E
2
South 715
1918-1558
3E
1
South 716
1918-1557
3E
1
h5128
1933-1837
3E
3
54 Sgr
1941-1618
3E
3
Cordoba 230
1901-2440
4E
2
South 710
1907-1614
4E
1
H VI 120
1922-1914
4E
1
h2875
1932-2053
4E
4
h2902
Aravamudan
1564
1953-2126
4E
4
1910-2118
5E
2
h1367
1911-1726
5E
1
Bur 422
1915-1804
5E
1
H V 77
1918-1852
5E
1
Component
A
B
C
A
B
A
B
A
B
C
D
A
B
A
B
A
B
A
B
A
B
C
BC
A
B
C
A
B
A
B
A
B
A
B
C
A
B
A
B
A
B
C
A
B
A
B
- 25 -
Mag
9.27
9.30
8.77
7.82
8.17
7.32
7.45
5.96
9.14
11.76
13.50
6.73
8.92
9.34
9.60
6.62
7.43
7.81
8.09
8.30
9.98
11.40
5.31
12.64
7.65
8.21
9.92
5.90
8.42
6.27
9.90
9.50
12.00
10.63
9.16
10.33
9.19
12.40
8.84
10.17
12.81
8.27
12.10
6.80
10.30
Separation
—
23.4 35.0 +
—
4.5 +
—
100 —
7.5 +
20.4 +
25.9
—
8.0 —
5.8 —
8.4 =
—
5.3 +
—
21.1 =
PA
—
54 =
35.0 +
—
149 —
236 =
—
89 =
20.4 +
25.9
—
308 +
—
113 +
—
16 =
—
194 —
111 =
4.1 —
38.0 +
45.6 —
8.7 —
6.4 =
—
90.5 —
0.7
10.3 +
—
16.3 +
—
14.4
—
13.9 =
25.9 +
—
12.2 —
39.6 -
134 +
—
274 +
45.6 —
195 +
—
0—
309 +
—
284
10.3 +
—
31 -?
—
146
—
63 =
25.9 +
—
39 —
159 =
Zone 245
Designation
Position
Rating
Component
Map
h2863
1919-1532
5E
1
h2883
1937-2137
5E
4
Bos 446
1946-2319
5E
4
See 396
1950-2343
5E
4
LDS 697
Jonckheere
1664
1959-2155
5E
4
1903-1532
4M
1
Howe 97
Aravamudan
300
1915-1721
4M
1
1952-1653
4M
3
h2904
1954-2356
4M
4
h5507
Hipparcos
2714
1906-1540
5M
1
1909-1716
5M
1
Hough 272
1922-1715
5M
1
See 384
1936-2319
5M
4
Bur 467
1947-2131
5M
4
H N 126
1904-2132
4D
2
h2853
1907-2000
5D
1
A
B
A
B
A
B
C
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
C
A
B
A
B
A
B
A
B
Mag
6.09
12.95
8.32
11.53
10.20
14.20
10.94
8.40
10.60
8.19
10.57
9.19
12.00
7.53
11.07
7.70
11.60
6.18
10.30
5.93
12.37
10.39
12.35
7.38
11.90
12.40
7.90
10.30
7.55
10.46
7.18
7.43
8.77
11.06
Separation
—
48.6 +
—
28
—
3.1
28.9 +
—
6.7 —
41.7 —
5.0
—
26.2 —
14.2
—
38.9 +!
—
46.9
—
14.5
—
12.3 +
4.9
—
5.2 —
3.3 +
—
1.2 +
—
15.1 +
PA
—
18 +
—
300
—
250
28.9 +
—
271 =
—
315 =
—
270
—
75 —
358
—
40 -!!
—
63
—
244
—
52 +
4.9
—
175 +
—
133 —
8 -!
—
88 -
Deep Space Objects
Object
Ruprecht 147
NGC 6793
NGC 6774
PK 17-21.1
Position
1917-1617
1922-2208
1917-1600
1947-2308
Rating
2E
5M
5D
5D
Map
1
2
1
4
Type
OC (III 2 m)
Oc (III 2p)
Oc (III 2m)
Pn (2a)
- 26 -
Specifications
Surface
Mag
Br
9.0
—
12.0
13.1
Population
20
23