Zone 243, Master Map
Normal View
-14°00'
Zone Master, Normal View, 10 deg FOV
ξ
Octans
c
-20°00'
e
-18°00'
Sagittarius
-16°00'
η Sabik
d
-24°00'
f
-22°00'
ξ
ο
θ
18h 00m
17h 52m
17h 44m
17h 36m
17h 28m
17h 20m
17h 12m
17h 04m
16h 56m
Zone 243, Map 1
Normal Image
-15°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
Eta Oph
Sabik
-17°00'
-16°00'
η
Stone 34
Bur 126
-18°00'
NGC 6356
h2806
h4932
h4923
Doolittle 64
-19°00'
NGC 6333
Bur 958
h4953
NGC 6342
Hussey 1280
17h 30m
17h 25m
17h 20m
17h 15m
17h 10m
17h 05m
17h 00m
Zone 243, Map 1
Mirror Image
-15°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
Sabik
Stone 34
Bur 126
NGC 6356
h4932
h4923
Doolittle 64
-18°00'
-17°00'
-16°00'
Eta Ophη
-19°00'
NGC 6333
Bur 958
h4953
NGC 6342
Hussey 1280
17h 00m
17h 05m
17h 10m
17h 15m
17h 20m
17h 25m
17h 30m
Zone 243, Map 2
Normal Image
-20°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
h4922
-21°00'
Donner 833
ξ Xi Oph
IC 4634
NGC 6287
-23°00'
h4948
NGC 6369
Aravamudan 2202 H VI 54
44 Oph
17h 30m
h4907
ο Omicron Oph
17h 25m
h589
Theta Oph
17h 20m
17h 15m
17h 10m
NGC 6284
17h 05m
17h 00m
-24°00'
NGC 6325
Barnard 72
θ
-22°00'
Holden 133
Zone 243, Map 2
Mirror Image
-20°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
h4922
-21°00'
Donner 833
ξ Xi Oph
Holden 133
-22°00'
IC 4634
NGC 6325
H VI 54
h4907
-23°00'
h4948
Barnard 72
NGC 6369
Aravamudan 2202
44 Oph
ο Omicron Oph
NGC 6284
h589
17h 00m
17h 05m
17h 10m
Theta Ophθ
17h 15m
17h 20m
17h 25m
17h 30m
-24°00'
NGC 6287
Zone 243, Map 3
Normal Image
-15°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
ξ
Fox 208
Hussey 184
-16°00'
h2814
Sagittarius
NGC 6439
PK 11+4.1
Octans
Barton 624
h590
NGC 6507
-17°00'
Bhaskaran 58
Harvard 147
-18°00'
h2806
Aravamudan 448
-19°00'
PK 8+5.1
NGC 6494
Bos 2846
Bos 2413
Doolittle 69
h2810
18h 00m
17h 55m
NGC 6445
17h 50m
Hussey 752
17h 45m
17h 40m
17h 35m
17h 30m
Zone 243, Map 3
Mirror Image
-15°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
ξ
Fox 208
Hussey 184
Octans
Sagittarius
NGC 6439
-16°00'
h2814
PK 11+4.1
Bhaskaran 58
-17°00'
Barton 624
h590
Harvard 147
-18°00'
h2806
Aravamudan 448
NGC 6494
Bos 2413
17h 35m
17h 40m
Bos 2846
h2810
NGC 6445
Hussey 752
17h 30m
Doolittle 69
-19°00'
PK 8+5.1
17h 45m
17h 50m
17h 55m
18h 00m
Zone 243, Map 4
Normal Image
h2810
NGC 6445
-20°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
Hussey 752
-21°00'
NGC 6440
Hipparcos 2513
Innes 602
58 Oph
-22°00'
PK 7+1.1
Bos 358
NGC 6469
h4990
h591
Innes 604
-23°00'
Barton 1507
Holden 30
-24°00'
Bos 352
NGC 6401
Terzian 5
18h 00m
17h 55m
17h 50m
17h 45m
17h 40m
17h 35m
17h 30m
Zone 243, Map 4
Mirror Image
-20°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
h2810
NGC 6445
Hussey 752
-21°00'
NGC 6440
Hipparcos 2513
58 Oph
PK 7+1.1
-22°00'
Innes 602
Bos 358
NGC 6469
h4990
h591
-23°00'
Barton 1507
Innes 604
Holden 30
-24°00'
Bos 352
NGC 6401
Terzian 5
17h 30m
17h 35m
17h 40m
17h 45m
17h 50m
17h 55m
18h 00m
Zone 243
2 Reference Stars, 42 Double Stars, 1 Dark Nebula,
7 Planetary Nebulae, 2 Open Clusters, 8 Globular Clusters
Flamsteed
H
44 Oph ................................................. 10
58 Oph ................................................. 27
H VI 54 ................................................ 12
h2806 ................................................... 20
h2810 ................................................... 28
h2814 ................................................... 19
h4907 ................................................... 10
h4922 ................................................... 15
h4923 ..................................................... 5
h4932 ..................................................... 4
h4948 ................................................... 13
h4953 ..................................................... 5
h4990 ................................................... 30
h589 ..................................................... 11
h590 ..................................................... 21
h591 ..................................................... 27
Harvard 147 ......................................... 24
Hipparcos 2513 .................................... 30
Holden 133........................................... 15
Holden 30............................................. 32
Hussey 1280........................................... 4
Hussey 184........................................... 21
Hussey 752........................................... 29
A
Aravamudan 2202................................ 14
Aravamudan 448.................................. 23
B
Barnard 72 ........................................... 18
Barton 1507 ......................................... 32
Barton 624 ........................................... 24
Bhaskaran 58 ....................................... 20
Bos 2413 .............................................. 23
Bos 2846 .............................................. 24
Bos 352 ................................................ 29
Bos 358 ................................................ 28
Bur 126 .................................................. 7
Bur 958 .................................................. 6
D
Donner 833 .......................................... 14
Doolittle 64 ............................................ 3
Doolittle 69 .......................................... 22
I
E
IC 4634 ................................................ 18
Innes 602.............................................. 31
Innes 604.............................................. 31
Eta Oph .................................................. 6
F
N
Fox 208 ................................................ 22
NGC 6284 ............................................ 17
-1-
Zone 243
O
NGC 6287............................................ 16
NGC 6325............................................ 19
NGC 6333.............................................. 8
NGC 6342.............................................. 9
NGC 6356.............................................. 9
NGC 6369............................................ 16
NGC 6401............................................ 34
NGC 6439............................................ 26
NGC 6440............................................ 35
NGC 6445............................................ 33
NGC 6469............................................ 34
NGC 6494............................................ 25
Omicron Oph ....................................... 12
P
PK 11+4.1 ............................................ 26
PK 7+1.1 .............................................. 35
PK 8+5.1 .............................................. 27
S
Stone 34 ................................................. 3
X
Xi Oph.................................................. 13
-2-
Zone 243
Zone 243, Map 1
Double Stars
Easy
Doolittle 64
Rating: 3 E
ADS 10352; HD 154766
Position: 1708-1826
A
B
Magnitude
9.58
10.79
Separation PA
—
—
4.3 +
204 +
Year
—
1991
Spectra
F5 V
Colors
W
W
Notes:
1900: 2.9 @ 184. 5 measurements.
Observations:
C11 at 98x. Nice field.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 4.35 inches.
Separation: AB = 6.44 miles.
Distance (LY): 960
Total luminosity (Suns): 14
Stone 34
Rating: 3 E
SAO 160417
Position: 1717-1709
A
B
Magnitude
9.43
10.34
Separation PA
—
—
17.2 +
289 =
Year
—
1992
Spectra
F5
Colors
W
B
Notes:
1879: 16.8 @ 289. 11 measurements. May be optical because Hipparcos gives
different distances (429 and 307 light years).
-3-
Zone 243
Observations:
C11 at 98x.
Hussey 1280
Rating: 4 E
ADS 10353
Position: 1708-1948
A
B
Magnitude
10.16
10.50
Separation PA
—
—
8.8 +
4+
Year
—
1919
Spectra
F2/3 V
Colors
W
W
Notes:
1919: 8.8 @ 4. 5 measurements.
Observations:
C11 at 98x. It is part of a small triangle, being the middle vertex of a north-south
triangle.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 4.80 inches.
Separation: AB = 1.89 miles.
Distance (LY): 138
Total luminosity (Suns): 0.321
h4932
H Wilson 14 (B); ADS 10422
Rating: 4 E
Position: 1716-1811
A
B
C
Magnitude
9.62
9.70
10.60
Separation
—
1.2 11.3 +
PA
—
292 226 +
Notes:
AB 1884: 1.3 @ 293. 9 measurements.
AC 1879: 10.7 @ 225. 6 measurements.
-4-
Year
—
1991
1982
Spectra
A3 II/III
Colors
W
No
?
Zone 243
Observations:
C11 at 98x.
h4953
Rating: 4 E
ADS B7999; HD 157828; SAO 160542
Position: 1726-1931
A
B
Magnitude
9.31
10.22
Separation PA
—
—
18.1 174 -
Year
—
1991
Spectra
A0 V
Colors
W
B
Notes:
1879: 19.0 @ 178. 10 measurements.
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 9.00 inches.
Separation: AB = 8.16 miles.
Distance (LY): 289
Total luminosity (Suns): 1.7
h4923
Rating: 5 E
ADS 10359; HD 154922; SAO 160317
Position: 1709-1815
A
B
Magnitude
8.48
10.31
Separation PA
—
—
14.7 +
149 -
Notes:
1879: 7.5 @ 168. 19 measurements.
Observations:
C8 at 104x. Moderate field.
-5-
Year
—
1991
Spectra
A2 III
Colors
W
W?
Zone 243
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 20.1 inches.
Separation: AB = 9.13 miles.
Distance (LY): 398
Total luminosity (Suns): 6
Moderate
Bur 958
Rating: 3 M
ADS 10427
Position: 1717-1920
A
B
Magnitude
9.14
9.63
Separation PA
—
—
1.8 +
212 -
Year
—
1991
Spectra
A9 V
Colors
W
W
Notes:
1880: 1.6 @ 215. 19 measurements.
Observations:
C11 at 634x.
Eta Oph
35 Oph; Sabik; Bur 1118; ADS 10374; HD 155125; SAO 160332
Rating: 5 M
Position: 1710-1543
A
B
C
Magnitude
2.43
13.06
11.64
Separation
—
97.9 +
100.6 +
PA
—
145 +
284 -
Year
—
1960
1960
Spectra
A2 IV
Colors
W
W?
W
Notes:
AB 1890: 94.6 @ 142. 3 measurements.
AC 1898: 99.8 @ 289. 5 measurements.
Star A is actually a very close binary discovered by S. Burnham in 1889 with the Lick
36" refractor.
The Aa orbit is highly eccentric and almost edge-on and takes 84.3 years to complete
(Knipe, 1959; but Van Biesbroeck in 1960 gives 88.0 years). Periastron will occur in
-6-
Zone 243
2020. The maximum separation is 1", and the magnitude of the companion is 3.4. The
extreme orbital size is 20 AU (about the distance from the Sun to Uranus).
B and C together are only 4% as bright as the Sun.
The primary is an infra-red source.
Bur 1118 is too close for an 8" scope (0.5").
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 10.8 inches.
Separation: AB = 13.3 miles; AC = 13.7 miles; Aa = 537 feet.
Distance (LY): 84
Total luminosity (Suns): 51.04
Difficult
Bur 126
Rating: 3 D
ADS 10465; SAO 160462
Position: 1720-1745
A
B
C
Magnitude
6.03
7.40
11.30
Separation
—
2.4 +
11.9 +
PA
—
262 +
141 =
Year
—
1995
1982
Spectra
A0 V
A6
Notes:
AB 1875: 1.7 @ 261. 53 measurements.
AC 1879: 11.6 @ 141. 11 measurements.
Observations:
C8 at 206x. Webb saw them as W and pB. Nice field!
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 9.00 inches; B = 8.08 inches.
Separation: AB = 1.39 miles; AC = 6.92 miles.
Distance (LY): 373
Total luminosity (Suns): 45.327
-7-
Colors
Y
O
?
Zone 243
Deep Sky Objects
Easy
NGC 6333
Rating: 3 E
Other Names: M9
Astronomical Leage Program: Messier Club, Messier Binocular Club
Position: 1719-1831
Type: Gc
Dimensions: 4'
Class: 8
Magnitude: 7.8
Notes:
Messier found it on May 28, 1764.
This globular is 80 light years in diameter. The brightest stars are 13.5m and the
horizontal branch is 16.2m.
Absorption here is about 2.4m.
Observations:
C8 at 104x. Mottled, with semi-resolved edges. Medium powers worked best for me.
Steve Coe writes that "the core is bright and oddly triangular in shape." The dark nebula
B64 lies off the SW edge.
C11 at 98x. Mottled, but not resolved. In a bleak field.
14x70 Binos. Very faint blob just N of a faint star. Sits on one leg of a large 9.5m
triangle.
Model (where the Sun is a baseball):
Its diameter would be 9,740 miles.
Distance (LY): 26,000
Radial velocity (km/sec): +224
Luminosity (suns): 41,700
-8-
Zone 243
Moderate
NGC 6356
Other Names: H I 48
Astronomical League Program: Herschel 400 Club
Rating: 3 M
Position: 1724-1749
Type: Gc
Dimensions: 1.6'
Class: 2
Magnitude: 8.6
Notes:
William Herschel found this cluster on June 17, 1784.
The brightest stars are 15.1m and the horizontal branch is 17.7m.
Absorption is estimated to be 2.8m here.
Observations:
C8 at 104x. Unresolved and compact. High powers work well, but show no details.
Geoff Chester says he resolved it with his 8" Newtonian. A bright star lies nearby.
C11 at 98x. Very small and compact, not resolved. Bright star lies to the S.
Model (where the Sun is a baseball):
Its diameter would be 4,940 miles.
Distance (LY): 33,000
Luminosity (suns): 70,000
NGC 6342
Other Names: H I 149
Astronomical League Program: Herschel 400 Club
Rating: 4 M
Position: 1721-1935
Type: Gc
Dimensions: 1.3'
Class: 4
Magnitude: 11.0
Notes:
This cluster was found by William Herschel on May 28, 1786.
The brightest stars are 15.0m and the horizontal branch is 16.9m.
Absorption in this area runs 3.7m or so.
-9-
Zone 243
Observations:
C8 at 83x. It has a bright core, but indistinct edges. A 10m star lies on the SW side.
The dark nebula B259 curves around the N side. Moderate field.
C11 at 98x. Very small and faint; almost stellar with a small halo. Not resolved.
Model (where the Sun is a baseball):
Its diameter would be 6,890 miles.
Distance (LY): 28,000
Luminosity (suns): 2,400?
Zone 243, Map 2
Reference Star
44 Oph (; HD 157792; SAO 185401)
Position: 1726-2411
Mag : 4.16
Spectrum : A3m
Color : W
Assumed distance: 84 light years
Assumed luminosity (suns): 11.6
Notes:
This star belongs to the Hyades Group.
Double Stars
Easy
h4907
Rating: 3 E
ADS 10292; SAO 184893
Position: 1700-2412
A
B
C
Magnitude
9.61
9.80
13.35
Separation
—
6.9 23.5
PA
—
37 21
- 10 -
Year
—
1991
1912
Spectra
A2 V
Colors
W
yW
?
Zone 243
Notes:
AB 1837: 15.0 @ 49. 16 measurements.
AC 1 measurement.
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 8.40 inches.
Separation: AB = 1.45 miles; AC = 4.95 miles.
Distance (LY): 135
Total luminosity (Suns): 0.411
h589
Rating: 3 E
ADS 10379; HD 155143; SAO 185112
Position: 1711-2457
A
B
Magnitude
8.19
8.65
Separation PA
—
—
10.0 301 -
Year
—
1991
Notes:
1820: 11.0 @ 305. 18 measurements.
Observations:
C8 at 83x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 7.48 inches; B = 7.69 inches.
Separation: AB = 1.98 miles.
Distance (LY): 127
Total luminosity (Suns): 1.1
- 11 -
Spectra
A3
A3
Colors
W
B?
Zone 243
Omicron Oph
39 Oph; ADS 10442; HD 156349; SAO 185238; H III 25
Astronomical League Program: Double Star Club
Rating: 3 E
Position: 1718-2417
A
B
Magnitude
5.14
6.59
Separation PA
—
—
10.2 355 -
Year
—
1995
Spectra
K0 III
Colors
Y
O
Notes:
William Herschel discovered the pair in 1782: 10.4 @ 357. 48 measurements.
The primary is an infra-red source.
May be optical because Hipparcos gives different distances (363 and 481 light years).
Observations:
C8 at 206x. Some observers report O and B.
H VI 54
Holden 132 (B); ADS 10452; HD 156504
Rating: 4 E
Position: 1719-2400
A
B
C
Magnitude
9.73
11.00
9.75
Separation
—
2.1 +
79.8 -
PA
—
31 +
142 -
Year
—
1991
1970
Spectra
A2 III/IV
Colors
W
W
W
Notes:
AB 1888: 2.0 @ 30. 8 measurements.
AC 1909: 80.0 @ 143. 5 measurements.
May be optical because Hipparcos gives different distances (69 and 880 light years).
Observations:
C11 at 98x. I had to use 339x to get B.
- 12 -
Zone 243
Xi Oph
40 Oph; Donner 832; HD 156897; SAO 185296
Rating: 5 E
Position: 1721-2107
A
B
Magnitude
4.38
8.90
Separation PA
—
—
3.9 +
44 -
Year
—
1966
Spectra
F2 IV
Colors
Y
?
Notes:
1932: 2.5 @ 66. 12 measurements.
Observations:
C8 at 206x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 8.10 inches.
Separation: AB = 1,795 feet.
Distance (LY): 57
Total luminosity (Suns): 4.51
h4948
Rating: 5 E
ADS 10519; HD 157470; SAO 185362
Position: 1725-2249
A
B
Magnitude
8.65
10.83
Separation PA
—
—
13.1 106 +
Year
—
1991
Notes:
1836: 16.5 @ 100. 8 measurements.
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 4.20 inches.
Separation: AB = 4.47 miles.
- 13 -
Spectra
F6 V
Colors
W
?
Zone 243
Distance (LY): 219
Total luminosity (Suns): 1.39
Moderate
Donner 833
Rating: 4 M
HD 157186; SAO 185334
Position: 1723-2049
A
B
Magnitude
8.88
12.10
Separation PA
—
—
7.2 +
253 +
Year
—
1987
Spectra
G8/K0 IV
Colors
Y
W
Notes:
1933: 5.9 @ 248. 3 measurements.
Observations:
C11 at 98x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 12.0 inches.
Separation: AB = 1.17 miles.
Distance (LY): 105
Total luminosity (Suns): 0.25
Aravamudan 2202
Rating: 5 M
HD 157748; SAO 185399
Position: 1726-2353
A
B
Magnitude
9.36
11.81
Separation PA
—
—
14.4
34
Notes:
1 measurement.
Observations:
C11 at 98x.
- 14 -
Year
—
1925
Spectra
A8 V
Colors
W
W
Zone 243
Difficult
Holden 133
Rating: 3 D
ADS 10509; HD 157351
Position: 1724-2143
A
B
Magnitude
8.77
9.29
Separation PA
—
—
1.0 168 +
Year
—
1991
Spectra
F6 V
Colors
W
W
Notes:
1888: 1.1 @ 163. 16 measurements.
Observations:
C11 at 634x.
h4922
Rating: 4 D
HD 154831; SAO 185067
Position: 1708-2013
A
B
C
Magnitude
7.79
11.24
13.50
Separation
—
21.1 22.0
PA
—
309 265
Year
—
1919
1906
Spectra
A0 IV
Colors
W
?
No
Notes:
AB 1836: 25.0 @ 314. 5 measurements.
AC 1 measurement.
Hipparcos/Tycho mission data show different distances for these stars (496 and 42
light years); they may be optical.
Observations:
C8 at 83x.
- 15 -
Zone 243
Deep Sky Objects
Easy
NGC 6369
Other Names: The Little Ghost; PK 2+5.1, H IV 11
Astronomical League Program: Herschel 400 Club
Rating: 3 E
Position: 1729-2346
Type: Pn
Dimensions: 28"
Class: 4
Magnitude: 11.0
Observations:
C8 at 104x. Round and bluish-green, it has high surface brightness, so it magnifies
well and shows an annulus. The N end seems a little brighter. It is bracketed by two
field stars NE and SW. It sits in the "bowl" of the Pipe Nebula.
About 1.5o W lies Barnard 72, the "Snake Nebula." Use a wide-field ocular or
binoculars to see it.
Model (where the Sun is a baseball):
Its diameter would be 170 miles.
Distance (LY): 3,900
Luminosity (suns): 47
Moderate
NGC 6287
Other Names: H II 195
Astronomical League Program: Herschel 400 Club
Rating: 3 M
Position: 1705-2242
Type: Gc
Dimensions: 2'
Class: 7
Magnitude: 10.4
Notes:
William Herschel found it on May 21, 1784.
Interstellar absorption here robs it of 2.9m!
- 16 -
Zone 243
Observations:
C8 at 104x. Faint, unresolved, even and quite round. A jagged E-W line of five 9m
stars lies S of here.
C11 at 98x. Dim and not resolved, it showed up as a hazy round glow. It slowly
brightens to the middle. The field to the S is nice, boasting a bright jagged chain.
Model (where the Sun is a baseball):
Its diameter would be 5,240 miles.
Distance (LY): 28,000
Luminosity (suns): 4,200
NGC 6284
Other Names: H VI 11
Astronomical League Program: Herschel 400 Club
Rating: 4 M
Position: 1705-2446
Type: Gc
Dimensions: 2'
Class: 9
Magnitude: 10.0
Notes:
William Herschel discovered this cluster on May 22, 1784.
The horizontal branch is 16.6m.
Absorption diminishes it by 1.1m.
Observations:
C8 at 104x. Faint and unresolved, it gets suddenly brighter toward the core. I was
surprised to see a totally empty field on the SE side.
C11 at 98x. Easy, bright and in a very rich field. The core is small (about 30 ") and
very bright. A very bright and rich field lies to the NW.
Model (where the Sun is a baseball):
Its diameter would be 10,670 miles.
Distance (LY): 57,000
Luminosity (suns): 25,000
- 17 -
Zone 243
Barnard 72
Other Names: S Neb; The Snake; LDN 66
Rating: 5 M
Position: 1724-2338
Type: Dn
Dimensions: 10' x 30'
Observations:
C8 at 104x. It is just a void in the field— no definite shape. Darker skies may make
it stand out more.
Difficult
IC 4634
Other Names: PK0+12.1
Rating: 5 D
Position: 1702-2150
Type: Pn
Dimensions: 20" x 10"
Class: 2a
Magnitude: 12.0
Notes:
It is very far away for a planetary nebula.
It was discovered in 1893 by Williamina Fleming.
Observations:
C8 at 65x. Faint and small, with a bright center. It is slightly elliptical in the N-S
axis.
Rich field.
Model (where the Sun is a baseball):
It would be 296 by 148 miles in size.
Distance (LY): 9,500
Luminosity (suns): 112
- 18 -
Zone 243
NGC 6325
Position: 1718-2346
Type: GC
Dimensions: 4'
Rating: 5 D
Class: 4
Magnitude: 10.6
Notes:
John Herschel found this globular on May 24,1835.
Observations:
C11 at 98x. Very small and faint; dense and not resolved. A very faint triangle of
stars lies just to the N. It brightens rapidly to the center.
Model (where the Sun is a baseball):
Distance (LY): 63,200
Luminosity (suns): 20,000
Zone 243, Map 1
Double Stars
Easy
h2814
Rating: 2 E
ADS 10891; HD 163336; SAO 160915
Position: 1756-1549
A
B
C
Magnitude
5.93
8.89
12.59
Separation
—
20.8 37.6 +
PA
—
156 349 =
Year
—
1982
1960
Spectra
A0 V
Colors
Y
B
No
Notes:
AB 1877: 21.0 @ 158. 11 measurements. The stars share common proper motion.
AC 1904: 33.7 @ 349. 2 measurements. Optical.
- 19 -
Zone 243
Observations:
C8 at 83x. Rich field.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 9.00 inches.
Separation: AB = 8.08 miles; AC = 14.6 miles.
Distance (LY): 249
Total luminosity (Suns): 22.7
h2806
Rating: 3 E
ADS 10578; HD 158376; SAO 160579
Position: 1730-1748
A
B
Magnitude
8.59
10.49
Separation PA
—
—
8.7 =
195 =
Year
—
1933
Spectra
K2 III
Colors
Y
W
Notes:
1879: 8.7 @ 195. 13 measurements.
The stars share common proper motion.
Observations:
C8 at 104x. Moderate field.
Bhaskaran 58
Rating: 3 E
SAO 160692
Position: 1737-1636
A
B
Magnitude
9.86
10.02
Separation PA
—
—
24.5
140
Notes:
1 measurement.
Observations:
C11 at 98x. Nice field.
- 20 -
Year
—
1916
Spectra
B9 V
A1V
Colors
W
W
Zone 243
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 9.60 inches; B = 8.70 inches.
Separation: AB = 4.39 miles.
Distance (LY): 115
Total luminosity (Suns): 0.228
Hussey 184
Rating: 3 E
ADS 10720; HD 160745
Position: 1742-1544
A
B
Magnitude
9.16
10.02
Separation PA
—
—
4.4 +
273 -
Year
—
1991
Spectra
A0 V
Colors
W
W
Notes:
1895: 4.1 @ 274. 15 measurements.
Observations:
C8 at 206x.
h590
Rating: 4 E
HD 158661; SAO 160608
Position: 1731-1708
A
B
Magnitude
8.19
10.14
Separation PA
—
—
36.1 +
310 -
Year
—
1991
Spectra
B0 II
Colors
bW
B
Notes:
1879: 35.8 @ 312. 9 measurements.
Hipparcos/Tycho mission data show different distances for these stars (8,600 and 136
light years); they may be optical.
Observations:
C8 at 104x.
- 21 -
Zone 243
Fox 208
Rating: 4 E
HD 162411; SAO 160862
Position: 1752-1529
A
B
Magnitude
8.96
10.54
Separation PA
—
—
25.4 147 =
Year
—
1991
Spectra
G5 V
Colors
yW
W
Notes:
1905: 27.9 @ 147. 6 measurements.
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 3.00 inches.
Separation: AB = 4,382 feet.
Distance (LY): 21
Total luminosity (Suns): 0.011
Doolittle 69
Rating: 4 E
HD 162940
Position: 1754-1927
A
B
Magnitude
9.34
10.61
Separation PA
—
—
10.7 +
89 +
Year
—
1933
Notes:
1912: 10.6 @ 88. 3 measurements.
Observations:
C11 at 98x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 49.5 inches.
Separation: AB = 1.00 mile.
Distance (LY): 59
Total luminosity (Suns): 0.068
- 22 -
Spectra
K1/3 III:
Colors
yO
W?
Zone 243
Aravamudan 448
Rating: 4 E
HD 163082; SAO 160900
Position: 1755-1818
A
B
Magnitude
8.75
11.14
Separation PA
—
—
7.6 +
68 =
Year
—
1991
Spectra
G8/K0 III
Colors
Y
?
Notes:
1917: 7.5 @ 68. 2 measurements.
Observations:
C11 at 98x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 46.2 inches.
Separation: AB = 11.4 miles.
Distance (LY): 960
Total luminosity (Suns): 24
Bos 2413
Rating: 5 E
HD 160746; SAO 160763
Position: 1742-1924
A
B
Magnitude
9.52
10.77
Separation PA
—
—
11.2 +
198 =
Year
—
1991
Notes:
1917: 10.3 @ 198. 7 measurements.
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 3.45 inches.
Separation: AB = 19.1 miles.
Distance (LY): 1,090
Total luminosity (Suns): 21
- 23 -
Spectra
G0 V
Colors
Y
?
Zone 243
Harvard 147
Rating: 5 E
Position: 1754-1726
A
B
Magnitude
10.53
10.8
Separation PA
—
—
12.3 205 -
Year
—
1991
Spectra
Colors
W
W
Notes:
1868: 12.7 @ 206. 6 measurements.
May be optical because Hipparcos gives different distances (58 and 29 light years).
Observations:
C11 at 98x.
Moderate
Barton 624
Rating: 4 M
Position: 1741-1653
A
B
Magnitude
10.19
11.00
Separation PA
—
—
2.9
278
Year
—
1932
Spectra
Colors
W
W
Notes:
1 measurement.
Observations:
C11 at 193x.
Bos 2846
Rating: 5 M
HD 163427
Position: 1757-1920
A
B
Magnitude
8.66
11.70
Separation PA
—
—
11.2 143 -
- 24 -
Year
—
1987
Spectra
A0 V
Colors
W
B
Zone 243
Notes:
1919: 12.5 @ 146. 3 measurements.
Observations:
C11 at 98x. It lies just S of the open cluster M23.
Deep Sky Objects
Easy
NGC 6494
Rating: 2 E
Other Names: Melotte 184; Collinder 356; Raab 126, M23
Astronomical Leage Program: Messier Club, Messier Binocular Club
Position: 1757-1901
Type: Oc
Magnitude: 5.5
Class: II 2r
Dimensions: 27'
Cluster population: 150
Notes:
Messier discovered it on June 20, 1764. He
said, "The stars of the cluster are very close to
each other."
This cluster is 300 million years old and 33
light years in diameter. The earliest spectra are
B9 types, and the cluster lies 25,600 light years
from the galaxy's center and 100 light years above
the galactic plane.
The brightest star is 10m.
Observations:
C8 at 65x. Contains many R stars, and a 6m
zinger on the NW side. Steve Coe, using a 13.5"
Newtonian, says this cluster reminds him of the
seats in a sports arena; hence his nickname of
"The Rose Bowl Cluster."
14x70 Binos. Very nice grouping of star dust
and glitter!
- 25 -
NGC 6494 (M23)
Open cluster (II 2 r; 150 stars)
Observed with C8 on 7/5/92
Magnification: 80x
Zone 243
Model (where the Sun is a baseball):
Its diameter would be 5,060 miles with stars 950 miles apart.
Distance (LY): 2,050
Luminosity (suns): 2,100
Moderate
PK 11+4.1
Other Names: M1-32
Rating: 3 M
Position: 1756-1630
Type: Pn
Surface brightness: 10.5
Class: 2
Dimensions: 8" x 7"
Magnitude: 12.0
Observations:
C11 at 98x, and 140x with an O-III filter. Small but fairly bright at 98x. At 140, not
much better.
NGC 6439
Other Names: PK 11+5.1
Rating: 4 M
Position: 1748-1628
Type: Pn
Surface brightness: 7.3
Class: 2a
Dimensions: 6" x 5"
Magnitude: 13.0
Notes:
The central star is 18.0m.
Observations:
C11 at 98x. Also C11 at 140x with O-III filter. At 98x, it was a small bloated star.
At 140x with the O-III, there was actually no improvement.
Distance (LY): 16,000
Total luminosity (Suns): 126
- 26 -
Zone 243
Difficult
PK 8+5.1
Other Names: The 4-2
Rating: 5 D
Position: 1746-1840
Type: Pn
Dimensions: 20"
Class: 3
Magnitude: 13.0
Observations:
C11 at 98x and 140x with O-III filter. The most ghostly of discs just detected with
tube movement. The O-III filter was not much help on this faint one!
Distance (LY): 8,800
Zone 243, Map 4
Reference Star
58 Oph (HD 160915; SAO 185660)
Position: 1743-2141
Mag : 4.86
Spectrum : F6 V
Color : W
Assumed distance: 57 light years
Assumed luminosity (suns): 2.8
Double Stars
Easy
h591
Rating: 4 E
HD 160768; SAO 185644
Position: 1743-2222
A
B
Magnitude
9.09
11.07
Separation PA
—
—
21.3 +! 12 -
- 27 -
Year
—
1992
Spectra
G1
Colors
W
?
Zone 243
Notes:
1820: 10.0 @ 15. 16 measurements.
Hipparcos/Tycho mission data show different distances for these stars (250 and 1,520
light years); they may be optical.
Observations:
C8 at 104x. It forms the E vertex of a 9m right triangle.
Bos 358
Rating: 4 E
ADS 10793; SAO 185767
Position: 1748-2211
A
B
Magnitude
9.77
10.69
Separation PA
—
—
24.7 +
219 -
Year
—
1991
Spectra
B5
Colors
W
W
Notes:
1920: 24.3 @ 220. 5 measurements.
B has a 13.00m companion at 4.3 @ 122 (1927).
Observations:
C8 at 104x.
h2810
Position: 1750-2000
A
B
C
Magnitude
7.59
10.51
10.7
Rating: 4 E
Separation
—
43.4 +
32.7
PA
—
188 302
Notes:
AB 1890: 40.9 @ 190. 10 measurements.
AC 1 measurement.
Observations:
C8 at 104x.
- 28 -
Year
—
1991
1909
Spectra
A2 V
Colors
W
?
No
Zone 243
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 8.40 inches.
Separation: AB = 35.2 miles; AC = 26.5 miles.
Distance (LY): 520
Total luminosity (Suns): 21
Hussey 752
Bos 2412; ADS 10662; HD 159819; SAO 185560
Rating: 5 E
Position: 1737-2003
A
B
C
D
CD
Magnitude
9.77
11.30
10.91
12.60
Separation
—
2.3 50.2 1.5
PA
—
329 =
92 -
Year
—
1953
1991
239
1933
Spectra
A0 V
Colors
W
No
dB!
No
Notes:
AB 1903: 2.7 @ 329. 5 measurements.
AC 1917: 50.5 @ 93. 6 measurements.
CD 1 measurement.
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 9.00 inches.
Separation: AB = 1,848 feet; AC = 7.75 miles; CD = 1,222 feet.
Distance (LY): 99
Total luminosity (Suns): 0.126
Bos 352
Rating: 5 E
ADS 10684; HD 160201; SAO 185600
Position: 1740-2341
A
B
Magnitude
9.58
11.16
Separation PA
—
—
52.9 +
186 +
- 29 -
Year
—
1991
Spectra
A2 V
Colors
W
W?
Zone 243
Notes:
1910: 52.3 @ 184. 4 measurements.
Observations:
C8 at 104x.
Hipparcos 2513
Rating: 5 E
HD 161487; SAO 185737
Position: 1747-2131
A
B
Magnitude
9.19
11.16
Separation PA
—
—
21.7 +
16 -
Year
—
1991
Spectra
F3 V
Colors
W
B?
Notes:
1920: 21.0 @ 17. 4 measurements.
May be optical because Hipparcos gives different distances (660 and 117 light years).
Observations:
C11 at 98x.
h4990
Rating: 5 E
ADS B8195; HD 162694; SAO 185896
Position: 1753-2221
A
B
Magnitude
9.96
11.18
Separation PA
—
—
23.5 =
300 =
Year
—
1991
Spectra
B8 II
Notes:
1890: 23.5 @ 300. 5 measurements.
Observations:
C8 at 104x. It lies on the E edge of the open cluster NGC 6469.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 48 inches.
Separation: AB = 6.82 miles.
- 30 -
Colors
W
W?
Zone 243
Distance (LY): 186
Total luminosity (Suns): 0.4
Moderate
Innes 604
Rating: 4 M
ADS 10608
Position: 1732-2300
A
B
Magnitude
9.06
9.17
Separation PA
—
—
2.6 233 -
Year
—
1991
Spectra
F3 V
Colors
W
W
Notes:
1907: 3.0 @ 240. 10 measurements.
Observations:
C11 at 193x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 4.80 inches.
Separation: AB = 2.19 miles.
Distance (LY): 540
Total luminosity (Suns): 10
Innes 602
Rating: 4 M
ADS 10604
Position: 1732-2134
A
B
Magnitude
9.96
10.46
Separation PA
—
—
3.3 +
312 +
Year
—
1991
Spectra
G5 V
Colors
Y
W
Notes:
1907: 3.0 @ 300. 7 measurements.
May be optical because Hipparcos gives different distances (41 and 228 light years).
Observations:
C11 at 140x.
- 31 -
Zone 243
Holden 30
Rating: 4 M
ADS 10664
Position: 1738-2323
A
B
C
Magnitude
8.28
9.51
12.23
Separation
—
3.3 =
69.1 +
PA
—
109 337 -
Year
—
1991
1928
Spectra
F3 V
Colors
W
W
?
Notes:
AB 1881: 3.3 @ 112. 17 measurements.
AC 1909: 68.3 @ 338. 4 measurements.
Observations:
C11 at 98x!
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 4.80 inches.
Separation: AB = 1.86 miles; AC = 39.1 miles.
Distance (LY): 363
Total luminosity (Suns): 6.70
Barton 1507
Rating: 5 M
HD 161375; SAO 185723
Position: 1746-2242
A
B
Magnitude
9.73
10.80
Separation PA
—
—
6.8 +!! 91 +?
Notes:
1920: 4.8 @ 270. Quadrant reversal?
Observations:
C11 at 98x.
- 32 -
Year
—
1921
Spectra
B2/3II
Colors
W
W
Zone 243
Deep Sky Objects
Easy
NGC 6445
Other Names: PK 8+3.1; The Little Gem, H II 586
Astronomical League Program: Herschel 400 Club
Rating: 3 E
Position: 1749-2001
Type: Pn
Dimensions: 35" x 30"
Class: 3b
Magnitude: 12.0
Notes:
William Herschel discovered it in
1786.
Observations:
C8 at 104x. Small and bright oval, it
magnifies well but shows no details. The
pair h2810 (7.7m-10.5m, 41" @ 189) is 5
minE. The globular cluster NGC 6440 is
22 min SE.
Model (where the Sun is a baseball):
Its diameter would be 246 miles.
Distance (LY): 4,500
Luminosity (suns): 25
NGC 6445
Planetary nebula (3a)
Observed with C11 on 7/24/03
Magnification: 115x + UHC
- 33 -
Zone 243
NGC 6469
Other Names: Melotte 182; Collinder 353; Raab 124
Rating: 4 E
Position: 1753-2221
Type: Oc
Dimensions: 12'
Class: IV 2m
Cluster population: 50
Magnitude: 8.2
Notes:
The earliest spectral type is B8.
It lies 22,500 light years from the galactic center and 180 light years above the
galactic plane and 229 million years old.
Observations:
C8 at 83x. It has a distinctive pentagon pattern. In the center lies the double h4990
(9.5m, 11.0m, 23" @ 300).
Model (where the Sun is a baseball):
Its diameter would be 5,840 miles with stars 1,570 miles apart.
Distance (LY): 1,800
Luminosity (suns): 132
Moderate
NGC 6401
Other Names: H I 44
Astronomical League Program: Herschel 400 Club
Rating: 5 M
Position: 1739-2355
Type: Gc
Dimensions: 1'
Class: 8
Magnitude: 11.0
Notes:
This globular was first cataloged as a bright nebula by William Herschel on May 21,
1785. His son John also thought it was a nebula, not being able to resolve it.
The horizontal branch is 17.3m.
Observations:
C8 at 83x. It is indistinct, compact and round. A nice triangle of 11m stars is NW of
the cluster. Rich field.
- 34 -
Zone 243
C11 at 98x. Very dim and not resolved. It fades into a very rich field. Class: 10.
Model (where the Sun is a baseball):
Its diameter would be 2,060 miles.
Distance (LY): 34,200
Luminosity (suns): 3,600
Difficult
NGC 6440
Other Names: H I 150
Astronomical League Program: Herschel 400 Club
Rating: 5 D
Position: 1750-2022
Type: Gc
Dimensions: 1'
Class: 5
Magnitude: 10.4
Notes:
William Herschel discovered this cluster on May 28, 1784.
The brightest stars are 17.0m and the horizontal branch is 18.4m.
Absorption here is thought to run a whopping 7.0m!
Observations:
C8 at 83x. Small and faint; use high powers.
Model (where the Sun is a baseball):
Its diameter would be 1,120 miles.
Distance (LY): 27,400
Luminosity (suns): 2,000,000
PK 7+1.1
Other Names: Hubble 6
Rating: 5 D
Position: 1755-2145
Type: Pn
Surface brightness: 7.7
Class: 2
Dimensions: 7"
- 35 -
Magnitude: 11.0
Zone 243
Notes:
The central star is 14.7m.
Observations:
C11 at 98x. It appears as a small, bloated star and was rather difficult. The surface
brightness seems to me to be highly overstated.
Distance (LY): 6,200
Total luminosity (Suns): 120
- 36 -
Zone 243
Zone 243 Mini-Catalog
Double Stars
Designation
Position
Rating
Map
h2814
1756-1549
2E
3
h4907
1700-2412
3E
2
Doolittle 64
1708-1826
3E
1
h589
1711-2457
3E
2
Stone 34
1717-1709
3E
1
Omicron Oph
1718-2417
3E
2
h2806
1730-1748
3E
3
Bhaskaran 58
1737-1636
3E
3
Hussey 184
1742-1544
3E
3
Hussey 1280
1708-1948
4E
1
h4932
1716-1811
4E
1
H VI 54
1719-2400
4E
2
h4953
1726-1931
4E
1
h590
1731-1708
4E
3
h591
1743-2222
4E
4
Bos 358
1748-2211
4E
4
h2810
1750-2000
4E
4
Fox 208
1752-1529
4E
3
Doolittle 69
Aravamudan
448
1754-1927
4E
3
1755-1818
4E
3
h4923
1709-1815
5E
1
Component
A
B
C
A
B
C
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
C
A
B
C
A
B
A
B
A
B
A
B
A
B
C
A
B
A
B
A
B
A
B
- 37 -
Mag
5.93
8.89
12.59
9.61
9.80
13.35
9.58
10.79
8.19
8.65
9.43
10.34
5.14
6.59
8.59
10.49
9.86
10.02
9.16
10.02
10.16
10.50
9.62
9.70
10.60
9.73
11.00
9.75
9.31
10.22
8.19
10.14
9.09
11.07
9.77
10.69
7.59
10.51
10.70
8.96
10.54
9.34
10.61
8.75
11.14
8.48
10.31
Separation
—
20.8 37.6 +
—
6.9 23.5
—
4.3 +
—
10.0 —
17.2 +
—
10.2 —
8.7 =
—
24.5
—
4.4 +
—
8.8 +
—
1.2 11.3 +
—
2.1 +
79.8 —
18.1 —
36.1 +
—
21.3 +!
—
24.7 +
—
43.4 +
32.7
—
25.4 —
10.7 +
—
7.6 +
—
14.7 +
PA
—
156 37.6 +
—
37 23.5
—
204 +
—
301 —
289 =
—
355 —
195 =
—
140
—
273 —
4+
—
292 11.3 +
—
31 +
79.8 —
174 —
310 —
12 —
219 —
188 32.7
—
147 =
—
89 +
—
68 =
—
149 -
Zone 243
Designation
Position
Rating
Map
Xi Oph
1721-2107
5E
2
h4948
1725-2249
5E
2
Hussey 752
1737-2003
5E
4
Bos 352
1740-2341
5E
4
Bos 2413
Hipparcos
2513
1742-1924
5E
3
1747-2131
5E
4
h4990
1753-2221
5E
4
Harvard 147
1754-1726
5E
3
Bur 958
1717-1920
3M
1
Donner 833
1723-2049
4M
2
Innes 602
1732-2134
4M
4
Innes 604
1732-2300
4M
4
Holden 30
1738-2323
4M
4
Barton 624
1741-1653
4M
3
Eta Oph
Aravamudan
2202
1710-1543
5M
1
1726-2353
5M
2
Barton 1507
1746-2242
5M
4
Bos 2846
1757-1920
5M
3
Bur 126
1720-1745
3D
1
Holden 133
1724-2143
3D
2
h4922
1708-2013
4D
2
Component
A
B
A
B
A
B
C
D
CD
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
C
A
B
A
B
C
A
B
A
B
A
B
A
B
C
A
B
A
B
C
- 38 -
Mag
4.38
8.90
8.65
10.83
9.77
11.30
10.91
12.60
9.58
11.16
9.52
10.77
9.19
11.16
9.96
11.18
10.53
10.80
9.14
9.63
8.88
12.10
9.96
10.46
9.06
9.17
8.28
9.51
12.23
10.19
11.00
2.43
13.06
11.64
9.36
11.81
9.73
10.80
8.66
11.70
6.03
7.40
11.30
8.77
9.29
7.79
11.24
13.50
Separation
—
3.9 +
—
13.1 —
2.3 50.2 -
PA
—
44 —
106 +
—
329 =
50.2 -
1.5
—
52.9 +
—
11.2 +
—
21.7 +
—
23.5 =
—
12.3 —
1.8 +
—
7.2 +
—
3.3 +
—
2.6 —
3.3 =
69.1 +
—
2.9
—
97.9 +
100.6 +
—
14.4
—
6.8 +!!
—
11.2 —
2.4 +
11.9 +
—
1.0 —
21.1 22.0
239
—
186 +
—
198 =
—
16 —
300 =
—
205 —
212 —
253 +
—
312 +
—
233 —
109 69.1 +
—
278
—
145 +
100.6 +
—
34
—
91 +?
—
143 —
262 +
11.9 +
—
168 +
—
309 22.0
Zone 243
Deep Space Objects
Object
NGC 6494
NGC 6333
NGC 6369
NGC 6445
NGC 6469
NGC 6287
NGC 6356
PK 11+4.1
NGC 6284
NGC 6342
NGC 6439
Barnard 72
NGC 6401
IC 4634
NGC 6325
PK 8+5.1
NGC 6440
PK 7+1.1
Position
1757-1901
1719-1831
1729-2346
1749-2001
1753-2221
1705-2242
1724-1749
1756-1630
1705-2446
1721-1935
1748-1628
1724-2338
1739-2355
1702-2150
1718-2346
1746-1840
1750-2022
1755-2145
Rating
2E
3E
3E
3E
4E
3M
3M
3M
4M
4M
4M
5M
5M
5D
5D
5D
5D
5D
Map
3
1
2
4
4
2
1
3
2
1
3
2
4
2
2
3
4
4
Type
Oc (II 2r)
Gc (8)
Pn (4)
Pn (3b)
Oc (IV 2m)
Gc (7)
Gc (2)
Pn (2)
Gc (9)
Gc (4)
Pn (2a)
Dn
Gc (8)
Pn (2a)
Gc (4)
Pn (3)
Gc (5)
Pn (2)
- 39 -
Specifications
Surface
Mag
Br
5.5
7.8
11.0
12.0
8.2
10.4
8.6
12.0
10.5
10.0
11.0
13.0
7.3
—
11.0
12.0
106
13.0
10.4
11.0
7.7
Population
150
50