Zone 267, Master Map
Normal View
-24°00'
ο
M8
-26°00'
θ
M19
c
f
τ
Sagittarius
M62
h
Corona Australis
Shaulaλ
υ
Lesath
e
Scorpius
µ2
µ1
κ
ι2
18h 32m 18h 24m
18h 08m
ι1
17h 52m 17h 44m
17h 28m 17h 20m 17h 12m
16h 56m 16h 48m 16h 40m 16h 32m
-34°00'
ε
M7
ε Kaus Australis
-36°00'
d
-38°00'
M6
-32°00'
γ2 Alnasl
g
η
-30°00'
Octans
γ1
δ Kaus Media
-28°00'
Zone Master, Normal View, 10 deg FOV
Zone 267, Map 1
Normal Image
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
-25°00'
NGC 6284
h589
Theta Oph
-26°00'
θ
Bur 128
NGC 6273
M19
NGC 6355
NGC 6293
36 Oph
-27°00'
South 385
Bur 125
Bur 127
-28°00'
Innes 1002
NGC 6316
Cordoba 205
-29°00'
h4919
NGC 6304
Trumpler 26
Hough 554
17h 30m
17h 25m
17h 20m
17h 15m
17h 10m
17h 05m
M62
17h 00m
Zone 267, Map 1
Mirror Image
h589
-25°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
-26°00'
Theta Ophθ
NGC 6273 M19
NGC 6355
NGC 6293
Bur 128
South 385
-27°00'
36 Oph
Bur 125
Bur 127
h4902
-28°00'
Innes 1002
NGC 6316
Cordoba 205
-29°00'
h4919
NGC 6304
Hough 554
17h 00m
M62
17h 05m
17h 10m
17h 15m
17h 20m
17h 25m
17h 30m
Zone 267, Map 2
Normal Image
M62
NGC 6266
Hough 413
-30°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
Holden 28
-31°00'
Terzian 2
Perth Obs 162
-32°00'
h4921
-33°00'
Terzian 4
Cordoba 209
-34°00'
Howe 39
h4935
17h 30m
17h 25m
17h 20m
17h 15m
17h 10m
17h 05m
17h 00m
Zone 267, Map 2
Mirror Image
h4903
M62
NGC 6266
-30°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
Hough 413
Terzian 2
Perth Obs 162
-31°00'
Holden 28
-33°00'
Terzian 4
-32°00'
h4921
-34°00'
Cordoba 209
h4935
17h 00m
17h 05m
17h 10m
17h 15m
17h 20m
17h 25m
17h 30m
Zone 267, Map 3
Normal Image
-35°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
h4935
-37°00'
-36°00'
Howe 85
NGC 6302
Harvard 266
Lesath
-38°00'
h4915
NGC 6281
Howe 86
-39°00'
υ
h4926
17h 30m
17h 25m
17h 20m
17h 15m
17h 10m
17h 05m
17h 00m
Zone 267, Map 3
Mirror Image
-35°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
h4935
-37°00'
-36°00'
Howe 85
NGC 6302
Harvard 266
υ
-38°00'
h4915
NGC 6281
Lesath
Howe 86
-39°00'
See 313
NGC 6242
h4926
17h 00m
17h 05m
17h 10m
17h 15m
17h 20m
17h 25m
17h 30m
Zone 267, Map 4
Normal Image
-26°00'
-25°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
6
h4986
h4991
-27°00'
Innes 1343
-28°00'
Stone 36
See 337
-29°00'
Howe 40
Bos 348
Bos 359
Collinder 347
Sagittarius
Octans
Argelander 30
18h 00m
17h 55m
17h 50m
17h 45m
17h 40m
17h 35m
17h 30m
Zone 267, Map 4
Mirror Image
-26°00'
-25°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
6
h4986
h4991
-27°00'
Innes 1343
-28°00'
Stone 36
See 337
-29°00'
Howe 40
Bos 348
Bos 359
Collinder 347
Trumpler 26
Sagittarius
Octans
Argelander 30
17h 30m
17h 35m
17h 40m
17h 45m
17h 50m
17h 55m
18h 00m
Zone 267, Map 5
Normal Image
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
-30°00'
Argelander 30
NGC 6451
h5003Scorpius
Terzian 1
-31°00'
Stone 37
Terzian 6
Cordoba 215
Cordoba 221
Terzian 4
NGC 6405
-32°00'
NGC 6425
M6
NGC 6416
Perth Obs 183
NGC 6383
Howe 96
h4962
-33°00'
Cordoba 219
Trumpler 27
Harvard 280
-34°00'
Howe 39
M7
18h 00m
NGC 6475
17h 55m
17h 50m
17h 45m
17h 40m
17h 35m
17h 30m
Zone 267, Map 5
Mirror Image
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
-30°00'
Argelander 30
NGC 6451
h5003
Scorpius
Terzian 1
Stone 37
-31°00'
Terzian 2
Terzian 6
NGC 6425
Cordoba 221
NGC 6405
M6
NGC 6383
-32°00'
Cordoba 215
Terzian 4
NGC 6416
Perth Obs 183
h4962
Howe 96
-33°00'
Cordoba 219
Trumpler 27
Harvard 280
-34°00'
Howe 39
M7
17h 30m
17h 35m
17h 40m
17h 45m
17h 50m
NGC 6475
17h 55m
18h 00m
Zone 267, Map 6
Normal Image
-35°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
-36°00'
Trumpler 30
Dunlop 219
h5000
G Sco
-37°00'
Russell 306
Lambda Sco
Shaulaλ
NGC 6400
NGC 6441
υ
Lesath
Bos 921
Innes 230
κ
Cordoba 222
18h 00m
17h 55m
ι2
17h 50m
-39°00'
-38°00'
Cordoba 216
Howe 87
NGC 6380
ι1
17h 45m
17h 40m
17h 35m
17h 30m
Zone 267, Map 6
Mirror Image
-35°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
-36°00'
Trumpler 30
Russell 306
λ
Lambda Sco
Shaula
h5000
G Sco
NGC 6400
Dunlop 219
NGC 6441
Corona Australis
Lesathυ
-37°00'
Sagittarius
Bos 921
-39°00'
-38°00'
Cordoba 216
κ
Howe 87
NGC 6380
ι1
17h 30m
17h 35m
17h 40m
17h 45m
Cordoba 222
ι2
17h 50m
17h 55m
18h 00m
Zone 267
47 Double Stars, 1 Bright Nebula, 12 Open Clusters,
10 Globular Clusters
Flamsteed
h4926......................................................... 19
h4935......................................................... 16
h4962......................................................... 33
h4986......................................................... 27
h4991......................................................... 26
h5000......................................................... 40
h5003......................................................... 30
Harvard 266 .............................................. 20
Harvard 280 .............................................. 34
Holden 28.................................................. 13
Hough 413................................................. 14
Hough 554................................................... 7
Howe 39 .................................................... 13
Howe 40 .................................................... 25
Howe 85 .................................................... 18
Howe 86 .................................................... 20
Howe 87 .................................................... 44
Howe 96 .................................................... 32
36 Oph......................................................... 3
A
Argelander 30............................................ 23
B
Bos 348 ..................................................... 26
Bos 359 ..................................................... 25
Bos 921 ..................................................... 42
Bur 125........................................................ 8
Bur 127........................................................ 5
Bur 128........................................................ 7
C
Collinder 347 ............................................ 28
Cordoba 205................................................ 6
Cordoba 209.............................................. 16
Cordoba 215.............................................. 30
Cordoba 216.............................................. 42
Cordoba 219.............................................. 33
Cordoba 221.............................................. 31
Cordoba 222.............................................. 45
I
Innes 1002................................................... 8
Innes 1343................................................. 23
L
D
Lambda Sco .............................................. 43
Dunlop 219................................................ 41
N
H
NGC 6256 ................................................. 22
NGC 6266 ................................................. 17
NGC 6273 ................................................... 9
NGC 6281 ................................................. 21
h4915......................................................... 19
h4919........................................................... 5
h4921......................................................... 14
-1-
Zone 267
Perth Obs 162............................................ 15
Perth Obs 183............................................ 32
NGC 6293 ................................................. 10
NGC 6302 ................................................. 22
NGC 6304 ................................................. 11
NGC 6316 ................................................. 10
NGC 6355 ................................................. 12
NGC 6380 ................................................. 47
NGC 6383 ................................................. 37
NGC 6400 ................................................. 46
NGC 6405 ................................................. 35
NGC 6416 ................................................. 37
NGC 6425 ................................................. 38
NGC 6441 ................................................. 46
NGC 6451 ................................................. 38
NGC 6475 ................................................. 36
R
Russell 306................................................ 40
S
See 337...................................................... 24
South 385 .................................................... 4
Stone 36 .................................................... 27
Stone 37 .................................................... 29
T
Trumpler 26 .............................................. 12
Trumpler 27 .............................................. 39
Trumpler 30 .............................................. 45
P
Palomar 6 .................................................. 29
-2-
Zone 267
Zone 267, Map 1
Double Stars
Easy
36 Oph
Sh 243; ADS 10417; HD 155886; SAO 185199
Astronomical League Program: Double Star Club
Rating: 1 E
Position: 1715-2636
A
B
C
D
Magnitude
4.33
4.34
6.33
7.63
Separation
—
4.7 731.8 272.3 +!
PA
—
148 -!
74 =
337 +!
Year
—
1996
1991
1991
Spectra
K0 V
K2
K1 V
Notes:
AB 1823: 5.7 @ 227. Over 100
measurements. A premature orbit has
been calculated A may be a
spectroscopic binary. The orbit takes
548.7 years (Brosche, 1960). Star A is
also an infra-red source.
AC 1960: 732.0 @ 74. 2
measurements. C shows common proper
motion with A.
AD 1822: 180.7 @ 290. 9
measurements.
Observations:
C8 at 104x. The whole system forms
a large right triangle that almost spans
the field. B was never detected.
Some observers report Y and R for
AC.
C11 at 98x.
36 Oph (Sh 243)
Observed with C11
on 9/21/03; s8, t10
Magnification: 98x
Okie-Tex Star Party
-3-
Colors
Y
yW
W
W?
Zone 267
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 2.40 inches; B = 19.8 inches; C = 25.2 inches.
Separation: AB = 739 feet; AC = 22.26 miles; AD = 8.28 miles.
Distance (LY): 19.5
Total luminosity (Suns): 1.21
South 385
Rating: 2 E
ADS 10436; HD 156252; SAO 185233; H I 35
Position: 1718-2638
A
B
Magnitude
7.09
8.60
Separation PA
—
—
6.0
335 +?
Year
—
1962
Spectra
A0 V
Notes:
The stars share common proper
motion.
Observations:
C8 at 83x.
C11 at 98x. (Okie-Tex Star Party,
2003)
Scale model (in which the Sun is the size
of a baseball):
Diameter: A = 9.00 inches.
Separation: AB = 4.10 miles.
Distance (LY): 438
Total luminosity (Suns): 27
South 385
Observed with C11
on 9/21/03; s8, t10
Magnification: 98x
Okie-Tex Star Party
-4-
Colors
O
Y
Zone 267
h4919
Rating: 5 E
HD 154641; SAO 185044
Position: 1708-2835
A
B
Magnitude
8.64
11.42
Separation PA
—
—
22.6 +
264 -
Year
—
1988
Spectra
A5 V
Colors
W
?
Notes:
1834: 18.0 @ 267. 4 measurements.
Abt claims 3 very faint comes.
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 7.50 inches.
Separation: AB = 12.4 miles.
Distance (LY): 351
Total luminosity (Suns): 4.26
Moderate
Bur 127
Rating: 2 M
ADS 10477; HD 156848
Position: 1721-2720
A
B
Magnitude
7.94
8.05
Separation PA
—
—
5.3 =
91 -
Notes:
1876: 5.3 @ 95. 18 measurements.
Observations:
C8 at 83x. Rich field.
C11 at 98x. (Okie-Tex Star Party, 2003)
-5-
Year
—
1991
Spectra
F5 V
Colors
W
O
Zone 267
Bur 127
Observed with C11
on 9/21/03; s8, t10
Magnification: 98x
Okie-Tex Star Party
Cordoba 205
Rating: 3 M
ADS 10300
Position: 1701-2824
A
B
Magnitude
8.22
8.72
Separation PA
—
—
2.6 75 -
Year
—
1991
Notes:
1912: 2.9 @ 77. 9 measurements.
Observations:
C11 at 193x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 8.70 inches.
Separation: AB = 1.16 miles.
Distance (LY): 288
Total luminosity (Suns): 5.55
-6-
Spectra
G1 V
Colors
W
W
Zone 267
Bur 128
Rating: 3 M
ADS 10547; HD 157865; SAO 185404
Position: 1727-2620
A
B
Magnitude
7.35
9.70
Separation PA
—
—
4.0 =
323 +
Year
—
1991
Spectra
B9 II
Colors
W
R
Notes:
1868: 4.0 @ 315. 14 measurements.
Observations:
C8 at 206x.
Hough 554
Rating: 4 M
ADS 10304; HD 153515; SAO 184918
Position: 1701-2941
A
B
C
Magnitude
8.02
12.90
11.44
Separation
—
9.8 36.0 +
PA
—
359 352 =
Notes:
AB 1893: 10.0 @ 0. 5 measurements.
AC 1896: 35.2 @ 352. 3 measurements.
Observations:
C8 at 83x.
-7-
Year
—
1904
1904
Spectra
G0 II
Colors
W
?
?
Zone 267
Difficult
Bur 125
Rating: 4 D
ADS 10388
Position: 1712-2703
A
B
C
Magnitude
6.75
9.44
13.00
Separation
—
1.8 +
77.7
PA
—
66 =
90
Year
—
1991
1892
Spectra
G8 IV
Colors
Y
W
W?
Notes:
AB 1877: 1.7 @ 66. 15 measurements.
AC 1 measurement.
Observations:
C11 at 634x. I got a peanut with marginal seeing.
Innes 1002
Rating: 4 D
ADS 10499
Position: 1723-2740
A
B
Magnitude
8.56
8.77
Separation PA
—
—
3.5 +
38 +
Notes:
1910: 3.0 @ 25. 7 measurements.
Observations:
C8 at 104x.
-8-
Year
—
1991
Spectra
G5 III
Colors
Y
?
Zone 267
Deep Sky Objects
Easy
NGC 6273
Rating: 3 E
Other Names: M19
Astronomical Leage Program: Messier Club, Messier Binocular Club
Position: 1703-2616
Type: Gc
Dimensions: 6'
Class: 8
Magnitude: 6.8
Notes:
Messier found it on June 5, 1764.
It is 130 light years in diameter.
The brightest stars are 14.0m and the
horizontal branch is 15.3m. It lies only
5,200 light years from the Galaxy's
center.
Observations:
C8 at 104x. Mottled, but
unresolved ("the finest stardust," says
Steve Coe). Very bright, it takes high
power well, and shows a slight oval
shape (N-S axis). It "also swims in a
lovely Milky Way field," writes Coe.
C11 at 98x. Loose and mottled
cluster in an extremely rich field. It
spanned 1/5 the fov. Class 10.
14x70 Binos. Confirmed by
moving across it in azimuth. Very
difficult. Bright center but very small
halo.
NGC 6273 (M19)
Globular cluster
Observed with C8 on 7/26/03
Magnification: 80
ASKC Star Party, Louisburg Lake
Model (where the Sun is a baseball):
Its diameter would be 19,660 miles.
Distance (LY): 35,000
Radial velocity (km/sec): +146
Luminosity (suns): 183,000
-9-
Zone 267
Moderate
NGC 6293
Other Names: H VI 12
Astronomical League Program: Herschel 400 Club
Rating: 4 M
Position: 1710-2635
Type: Gc
Dimensions: 1.9
Class: 4
Magnitude: 8.8
Notes:
William Herschel found it on May 24, 1784.
The brightest stars are 14.3m and the horizontal branch is 16.5m.
Absorption amounts to 1.3m here.
Observations:
C8 at 104x. Unresolved, but brighter towards the core. It has an E-W axis. There is
a blue star near the E edge.
The stem of B59, the Pipe Nebula, lies just S.
There is a neat tiny triangle of stars just off the SE edge.
Model (where the Sun is a baseball):
Its diameter would be 8, 010 miles.
Distance (LY): 45,000
Luminosity (suns): 48,000
NGC 6316
Other Names: H I 45
Astronomical League Program: Herschel 400 Club
Rating: 5 M
Position: 1717-2808
Type: Gc
Dimensions: 1'
Class: 3
Magnitude: 9.9
Notes:
William Herschel discovered this cluster on May 24, 1784.
The brightest stars are 16.0m and the horizontal branch is 17.8m.
Absorption in this part of the galaxy runs about 3.3m.
- 10 -
Zone 267
Observations:
C8 at 104x. Bright, but a star to the S (9.1m SAO 185221) is hard on the seeing.
Use high powers, although resolution is not possible with an 8".
Model (where the Sun is a baseball):
Its diameter would be 3,750 miles.
Distance (LY): 40,000
Luminosity (suns): 14,200
Difficult
NGC 6304
Other Names: H I 147
Astronomical League Program: Herschel 400 Club
Rating: 4 D
Position: 1715-2928
Type: Gc
Dimensions: 1.6'
Class: 6
Magnitude: 9.2
Notes:
William Herschel found this cluster on August 30,1786.
The brightest stars are 14.2m and the horizontal branch is 16.2m.
Absorption here runs a hefty 3.9m.
Observations:
C8 at 104x. Faint, unresolved and round. Use high power. It is surrounded by
brighter stars.
Model (where the Sun is a baseball):
Its diameter would be 2,400 miles.
Distance (LY): 16,000
Luminosity (suns): 4,200
- 11 -
Zone 267
Trumpler 26
Other Names: Harvard 15; Collinder 331
Rating: 4 D
Position: 1729-2929
Type: Oc
Dimensions: 10'
Class: III 2p
Cluster population: 40
Magnitude: 9.0
Observations:
C8 at 83x. A sparse, nebulous knot; a 9m star at the S end dominates.
Distance (LY): 9,100
Luminosity (suns): 1,600
NGC 6355
Other Names: Collinder 330, H I 46
Astronomical League Program: Herschel 400 Club
Rating: 5 D
Position: 1724-2621
Type: Gc
Magnitude: 9.8
Dimensions: 1'
Notes:
William Herschel found this cluster on May 24, 1784.
The horizontal branch is 17.2m.
Observations:
C8 at 83x. Indistinct and compact, near two fairly bright stars (9m, 10m).
Model (where the Sun is a baseball):
Its diameter would be 2,060 miles.
Distance (LY): 31,000
Luminosity (suns): 9,000
- 12 -
Zone 267
Zone 267, Map 2
Double Stars
Easy
Holden 28
Rating: 3 E
SAO 208777
Position: 1725-3032
A
B
Magnitude
8.52
9.15
Separation PA
—
—
3.6 +
233 -
Year
—
1991
Spectra
K0 III
Colors
Y
yO
Notes:
1881: 3.4 @ 237. 15 measurements.
The stars share a large common proper motion.
Observations:
C8 at 280x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 46.2 inches.
Separation: AB = 1.07 miles.
Distance (LY): 192
Total luminosity (Suns): 1.8
Howe 39
Hough 646; HD 158320; SAO 208881
Rating: 4 E
Position: 1730-3343
A
B
C
D
Magnitude
6.68
9.60
11.50
9.39
Separation
—
4.4 +
14.6 59.0 +
PA
—
320 =
314 29 =
- 13 -
Year
—
1991
1934
1985
Spectra
B2 Ib
Colors
W
B
?
B
Zone 267
Notes:
AB 1876: 3.9 @ 320. 12 measurements.
AC 1893: 15.0 @ 315. 5 measurements.
AD 1881: 58.7 @ 29. 9 measurements.
A is a spectroscopic binary with a period of 38.10 days.
Observations:
C8 at 206x.
h4921
Rating: 5 E
HD 154871
Position: 1709-3140
A
B
C
Magnitude
8.85
9.36
13.20
Separation
—
8.7 +
20.6
PA
—
146 +
95
Year
—
1991
1919
Spectra
A1 V
Colors
Y
pO
No
Notes:
AB 1834: 4.0 @ 139. 12 measurements.
AC 1 measurement.
Observations:
C8 at 104x.
Hough 413
Rating: 5 E
HD 157075; SAO 208738
Position: 1722-3012
A
B
Magnitude
8.02
11.36
Separation PA
—
—
16.2 +
309 +
Notes:
AB 1892: 7.4 @ 281. 7 measurements.
Observations:
C8 at 104x.
- 14 -
Year
—
1991
Spectra
G0 V
Colors
bW
?
Zone 267
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 3.45 inches.
Separation: AB = 5.56 miles.
Distance (LY): 220
Total luminosity (Suns): 2.5
Moderate
Perth Obs 162
Rating: 5 M
HD 158020; SAO 208852
Position: 1728-3112
A
B
Magnitude
7.73
12.34
Separation PA
—
—
14.4
120
Year
—
1911
Notes:
1 measurement.
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 46.2 inches.
Separation: AB = 96.6 miles.
Distance (LY): 4,300
Total luminosity (Suns): 1,218
- 15 -
Spectra
K0 III
Colors
Y
?
Zone 267
Difficult
h4935
Bos 416; Melbourne Obs 4; HD 156384; SAO 208670
Rating: 4 D
Position: 1719-3459
A
B
C
D
Magnitude
5.91
6.33
9.60
12.90
Separation
—
2.1 +
31.5 +
20.8 -!!
PA
—
272 +
140 +
307 -!!
Year
—
1992
1988
1959
Spectra
K5 V
K5 V
Colors
O
?
B
?
Notes:
AB 1876: 1.8 @ 240. Over 100 measurements. Period is 42.177 years, semi-major
axis of 1.82", motion retrograde.
AC 1894: 30.0 @ 129. 47 measurements. C is physical.
Observations:
C8 at 516x. AB was elongated.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 54.3 inches; B = 30.6 inches.
Separation: AB = 370 feet; AC = 1.13 miles; AD = 3,960 feet.
Distance (LY): 23
Total luminosity (Suns): 0.30728
Cordoba 209
Rating: 5 D
HD 155402; SAO 208535
Position: 1713-3321
A
B
Magnitude
7.85
10.06
Separation PA
—
—
10.4 +
138 -
Year
—
1987
Spectra
B5 II
Notes:
AB 1920: 10.3 @ 139. 5 measurements.
Observations:
C8 at 280x. 20 min NE of here is a nice curve of seven 9m stars.
- 16 -
Colors
bW
W
Zone 267
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 12.0 inches.
Separation: AB = 17.7 miles.
Distance (LY): 1,090
Total luminosity (Suns): 109
Deep Sky Objects
Easy
NGC 6266
Rating: 2 E
Other Names: M62
Astronomical Leage Program: Messier Club, Urban Deep Sky Club, Messier Binocular
Club
Position: 1701-3007
Type: Gc
Dimensions: 14'
Class: 4
Magnitude: 6.5
Notes:
Messier cataloged it on June 4, 1779, even
though he had seen it in 1771.
It is 80 light years in diameter. The
brightest stars are 13.0m and the horizontal
branch is 16.3m. It lies 6,100 light years from
the Galaxy's center, which may explain its
somewhat distorted shape.
It is a post-core collapse cluster.
Observations:
C8 at 206x. Mottled and asymmetric (NESW axis— the SE region is obscured by a dust
cloud), it brightens rapidly toward the center.
A 11m star lies 3 min S.
C11 at 98x. Easy and large object (fills
1/4 the fov), it is semi-resolved. It brightens
rapidly toward a very bright core. It is offcenter, being brighter on the N and W sides.
Class 3.
- 17 -
NGC 6266 (M62)
Globular cluster
Observed with C8 on 7/26/03
Magnification: 80x
ASKC Star Party, Louisburg Lake
Zone 267
14x70 Binos. Badly washed out by the haze and Kansas City skyglow. Barely seen
with averted vision; lost entirely with direct vision.
Model (where the Sun is a baseball):
Its diameter would be 34,080 miles.
Distance (LY): 22,500
Luminosity (suns): 100,000
Zone 267, Map 3
Double Stars
Easy
Howe 85
Rating: 3 E
HD 154407
Position: 1707-3553
A
B
Magnitude
7.66
8.21
Separation PA
—
—
5.0 -!! 23-!!
Year
—
1993
Notes:
1876: 30.0 @ 205. 12 measurements.
Observations:
C8 at 206x. It forms the E vertex of a small 9m triangle.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 13.2 inches.
Separation: AB = 19.9 miles.
Distance (LY): 2,550
Total luminosity (Suns): 442
- 18 -
Spectra
B2 V
Colors
W
W
Zone 267
h4926
Rating: 4 E
HD 155603; SAO 208569
Position: 1714-3946
A
B
C
Magnitude
6.42
10.02
10.38
Separation
—
14.2 +
16.9 +
PA
—
334 =
210 -
Year
—
1933
1933
Spectra
K0 Ia
Colors
dO
?
?
Notes:
AB 1835: 11.0 @ 334. 8 measurements.
AC 1835: 14.0 @ 211. 8 measurements.
Observations:
C8 at 83x. Others note O, ?. Hartung says rO, W, and W.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 2.85 inches.
Separation: AB = 1,850 feet; AC = 2,220 feet.
Distance (LY): 16
Total luminosity (Suns): 0.059
h4915
Position: 1705-3753
A
B
Magnitude
7.97
11.30
Rating: 5 E
Separation PA
—
—
11.4 +
337 -
Year
—
1919
Spectra
K
Notes:
1834: 6.0 @ 339. 2 measurements.
Observations:
C8 at 104x. It lies in the open cluster NGC 6281 (near the center).
- 19 -
Colors
Y
?
Zone 267
Moderate
Harvard 266
Rating: 4 M
HD 154310; SAO 208406
Position: 1706-3714
A
B
C
Magnitude
5.98
10.54
13.41
Separation
—
5.9 43.3 +!
PA
—
80 187 +
Year
—
1965
1900
Spectra
A2 IV
Colors
W
?
?
Notes:
AB 1891: 7.0 @ 90. 5 measurements. May be optical because Hipparcos gives
different distances (422 and 9 light years).
AC 1891: 30.0 @ 185. 2 measurements.
Observations:
C8 at 206x.
Howe 86
Rating: 4 M
HD 155536; SAO 208556
Position: 1714-3818
A
B
Magnitude
6.74
8.72
Separation PA
—
—
2.7 +
146 +
Year
—
1991
Notes:
1876: 1.8 @ 140. 17 measurements.
Observations:
C8 at 280x. Others note W, R.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 4.35 inches.
Separation: AB = 1.56 miles.
Distance (LY): 371
Total luminosity (Suns): 26
- 20 -
Spectra
F5 V
Colors
W
?
Zone 267
Deep Sky Objects
Easy
NGC 6281
Other Names: Melotte 161; Collinder 324; Raab 118
Rating: 2 E
Position: 1705-3754
Type: Oc
Dimensions: 8'
Class: II 2pn
Cluster population: 25
Magnitude: 5.4
Notes:
This cluster is 134 million years old. At least
70 stars are known to be members. The brightest
member is 7.9m.
It lies 26,000 light years from the galactic
center and 60 light years above the galactic plane.
Observations:
C8 at 83x. Very rich; it is in the shape of an
acute triangle with the vertex pointing S. High
powers don't help a lot.
Model (where the Sun is a baseball):
Its diameter would be 1,500 miles with stars
220 miles apart.
NGC 6281
Open cluster (II 2 pn; 25 stars)
Observed with C8 on 7/22/95
Magnification: 104x
Distance (LY): 1,560
Luminosity (suns): 1,320
- 21 -
Zone 267
Moderate
NGC 6302
Other Names: PK 349+1.1; The Bug Nebula
Astronomical League Program: Caldwell Club
Rating: 5 M
Position: 1714-3700
Type: Gn
Class: 6
Dimensions: 2' x 1'
Notes:
It was discovered by James Dunlop in 1826 but missed by John Herschel, and
rediscovered by Barnard in 1883.
Towards the end of the long life of many low mass stars, some similar to the Sun,
internal changes occur which cause them to shed most of their outer layers of gas, leaving
behind a tiny, hot star. Many stars puff off their gas in a spherical shell. The shell can be
very bright and superficially resembles the disc of a planet, hence the name for this class
of object. In some cases, as in this example, the gas expands unevenly and an irregular
planetary nebula results. In NGC 6302, some of the gas ejected by the star is travelling
outwards at around 400 kilometers per second, indicating a particularly violent outburst.
[Source: http://www.aao.gov.au/images/captions/aat011.html]
Observations:
C8 at 83x. Faint, but no details. The illuminating star at the center is 10m and easily
visible at high power.
Distance (LY): 9,800
Difficult
NGC 6256
Other Names: Terzan 12
Rating: 5 D
Position: 1700-3707
Type: GC
Magnitude: 11.2
Notes:
John Herschel first noted it between 1834 and 1838.
- 22 -
Dimensions: 7'
Zone 267
Observations:
C11 at 98x. Extremely faint and small, it looked like a blurry star (center) with
extensive halo. Four bright stars form a long, low trapezoid to the SE. The two narrow
sides point to the cluster. Class 2? Hard to tell with a cluster this faint and small.
Distance (LY): 27,400
Total luminosity (Suns): 2,000
Zone 267, Map 4
Double Stars
Easy
Innes 1343
Bos 2844 (C); ADS 10837; HD 162437; SAO 185863
Rating: 3 E
Position: 1752-2654
A
B
Magnitude
8.34
9.97
Separation PA
—
—
17.4 =
159 +
Year
—
1960
Spectra
B8 III
Colors
W
bW
Notes:
1912: 17.4 @ 156. 3 measurements.
Observations:
C8 at 104x. Very nice, rich and faint field.
Argelander 30
Rating: 4 E
HD 160809; SAO 185649
Position: 1743-2955
A
B
Magnitude
8.68
9.39
Separation PA
—
—
36.0 291 - 23 -
Year
—
1991
Spectra
K2 III
Colors
Y
B
Zone 267
Notes:
1880: 36.7 @ 292. 11 measurements.
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 49.5 inches.
Separation: AB = 121 miles.
Distance (LY): 2,150
Total luminosity (Suns): 164
See 337
Rating: 4 E
ADS 10753; HD 161229; SAO 185705
Position: 1746-2804
A
B
C
Magnitude
8.60
10.30
Separation
—
9.9 74.3 -
PA
—
884 -
Year
—
1987
1987
Spectra
B7 IV/V
Colors
bW
W
No
Notes:
AB 1897: 10.0 @ 10. 6 measurements.
AC 1913: 74.4 @ 85. 4 measurements.
Observations:
C8 at 104x. It is the S vertex of a very flat triangle with a 9m star (W) and a 9.5m star
(E).
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 10.8 inches.
Separation: AB = 4,280 feet; AC = 6.14 miles.
Distance (LY): 53
Total luminosity (Suns): 0.1
- 24 -
Zone 267
Bos 359
Rating: 4 E
ADS 10820; HD 162120; SAO 185832
Position: 1751-2917
A
B
Magnitude
8.33
10.49
Separation PA
—
—
46.9 +
340 +
Year
—
1991
Spectra
A2 V
Colors
W
?
Notes:
1913: 45.2 @ 338. 5 measurements.
B has two faint and close companions.
Observations:
C8 at 104x. It lies in the open cluster Collinder 347.
A hazy region lies 3 min SW.
Howe 40
Rating: 4 E
ADS 10838; HD 162438
Position: 1752-2828
A
B
C
D
Magnitude
8.27
10.50
12.94
12.00
Separation
—
6.9 +
12.7 +
20.2
PA
—
11 =
358 +
4
Year
—
1960
1898
1898
Spectra
G5 III
Notes:
AB 1877: 6.3 @ 11. 13 measurements.
AC 1897: 12.3 @ 357. 2 measurements.
AD 1 measurement.
B has a 10.90m companion at 1.3 @ 175 (1889).
Observations:
C8 at 104x. Rich field.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 39 inches.
Separation: AB = 3.07 miles; AC = 5.66 miles; AD = 9.01 miles.
- 25 -
Colors
yW
W
?
No
Zone 267
Distance (LY): 286
Total luminosity (Suns): 3.6
h4991
Position: 1753-2639
A
B
Magnitude
9.96
10.02
Rating: 4 E
Separation PA
—
—
23.2 +
359 =
Year
—
1991
Spectra
Colors
W
W
Notes:
1834: 18.0 @ 359. 4 measurements.
Observations:
C11 at 98x.
Distance (LY): 129
Total luminosity (Suns): 0.260
Moderate
Bos 348
Rating: 5 M
ADS 10653
Position: 1737-2859
A
B
Magnitude
9.01
10.62
Separation PA
—
—
5.2 =
214 -
Notes:
1926: 5.2 @ 217. 3 measurements.
Observations:
C8 at 104x.
- 26 -
Year
—
1964
Spectra
B9 V
Colors
bW
W?
Zone 267
Stone 36
Rating: 5 M
ADS 10739; HD 161004; SAO 185671
Position: 1744-2727
A
B
Magnitude
8.74
10.88
Separation PA
—
—
8.3 +
205 -
Year
—
1987
Spectra
B9 IV(e)
Colors
W
W
Notes:
1878: 7.4 @ 210. 10 measurements.
Observations:
C11 at 98x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 12.0 inches.
Separation: AB = 12.0 miles.
Distance (LY): 930
Total luminosity (Suns): 25
Difficult
h4986
Rating: 5 D
ADS 10817; HD 162082; SAO 185823
Position: 1750-2620
A
B
C
D
Magnitude
8.14
11.30
12.20
12.19
Separation
—
10.8 22.9
27.2
PA
—
227 5
61
Notes:
AB 1834: 12.0 @ 230. 4 measurements.
AC and AD, 1 measurement.
Observations:
C8 at 104x.
- 27 -
Year
—
1920
1834
1834
Spectra
B8 V
Colors
bW
?
?
?
Zone 267
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 10.2 inches.
Separation: AB = 2.20 miles; AC = 4.68 miles; AD = 5.56 miles.
Distance (LY): 131
Total luminosity (Suns): 0.8704
Deep Sky Objects
Moderate
Collinder 347
Position: 1746-2918
Type: Oc
Dimensions: 4'
Rating: 4 M
Class: III 2pn
Cluster population: 40
Magnitude: 8.8
Notes:
This cluster is 6 light years in diameter and 12 million years old.
Observations:
C8 at 104x. This cluster lies only 15 min SE of the spot in the sky where we'd see the
galaxy's center, if the core was not obscured. High powers resolve six stars and much
graininess. At low powers, it is a nebulous, oblong patch 3 min W of two 9m stars. It
lies embedded in the nebula Sh 2-16.
The brightest cluster star is 10.7m.
Model (where the Sun is a baseball):
Its diameter would be 1,930 miles with stars 282 miles apart..
Distance (LY): 4,900
Luminosity (suns): 570
- 28 -
Zone 267
Difficult
Palomar 6
Position: 1744-2613
Type: GC
Dimensions: 7.2'
Rating: 5 D
Class: 11
Magnitude: 11.6
Observations:
C11 at 98x. Three moderately bright stars form a dog-leg that runs from the SW to
the NE. The NE end is the brightest star, and this cluster lies just beyond that star on the
same line as the dog-leg. It is a slightly richer grainy part of the field. Class 12.
Model (where the Sun is a baseball):
Distance (LY): 23,800
Luminosity (suns): 1,000
Zone 267, Map 5
Double Stars
Easy
Stone 37
Piazzi 5; HD 162220; SAO 209357
Rating: 3 E
Position: 1751-3033
A
B
Magnitude
6.70
8.09
Separation PA
—
—
10.1 +
190 +
Notes:
1877: 9.9 @ 189. 17 measurements.
Observations:
C8 at 104x.
- 29 -
Year
—
1991
Spectra
B9 V
Colors
yW
gB
Zone 267
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 9.60 inches.
Separation: AB = 19.7 miles.
Distance (LY): 1,250
Total luminosity (Suns): 365
h5003
Piazzi 6 (B); HD 163755; SAO 209553
Rating: 3 E
Position: 1759-3015
A
B
C
Magnitude
5.30
6.85
13.10
Separation
—
5.5 26.0 -
PA
—
105 239 -
Year
—
1991
1919
Spectra
K5 III
M0 I
Colors
O
R
No
Notes:
Star A is a spectroscopic binary and an infra-red source as well as being variable.
AB 1836: 6.2 @ 107. 35 measurements.
AC 1891: 30.0 @ 240. 3 measurements.
Observations:
C8 at 104x. Some report both as R.
A line of five or six 9m stars trails away to the SW from this pair.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 54.3 inches; B = 37.1 inches.
Separation: AB = 7.98 miles; AC = 37.7 miles.
Distance (LY): 930
Total luminosity (Suns): 799
Cordoba 215
Rating: 4 E
HD 159310; SAO 208996
Position: 1735-3149
A
B
Magnitude
9.23
9.69
Separation PA
—
—
8.1 +
357 -
- 30 -
Year
—
1991
Spectra
B9 V
Colors
bW
W
Zone 267
Notes:
AB 1911: 7.8 @ 359. 9 measurements.
Observations:
C8 at 206x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 9.60 inches.
Separation: AB = 1.42 miles.
Distance (LY): 113
Total luminosity (Suns): 0.3
Cordoba 221
Rating: 4 E
HD 161889; SAO 209313
Position: 1749-3200
A
B
Magnitude
8.78
9.89
Separation PA
—
—
9.2 308 -
Year
—
1991
Notes:
AB 1911: 9.3 @ 309. 15 measurements.
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 8.10 inches.
Separation: AB = 6.58 miles.
Distance (LY): 459
Total luminosity (Suns): 7
- 31 -
Spectra
A3 V
Colors
W
Y
Zone 267
Perth Obs 183
Rating: 4 E
HD 162272; SAO 209368
Position: 1754-3228
A
B
Magnitude
7.79
10.50
Separation PA
—
—
5.7 334 +
Year
—
1991
Spectra
G8 III
Colors
yW
Y
Notes:
1909: 5.8 @ 325. 6 measurements.
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 43.5 inches.
Separation: AB = 22.9 miles.
Distance (LY): 2,570
Total luminosity (Suns): 420
Howe 96
Rating: 5 E
HD 160281; SAO 209118
Position: 1741-3245
A
B
Magnitude
8.40
10.30
Separation PA
—
—
5.5 +
246 +
Notes:
1876: 2.5 @ 240. 5 measurements.
Observations:
C8 at 104x. It lies on the S edge of M6.
- 32 -
Year
—
1944
Spectra
B8 V
Colors
bW
pO
Zone 267
Cordoba 219
Rating: 5 E
HD 160854; SAO 209190
Position: 1744-3256
A
B
Magnitude
8.51
10.10
Separation PA
—
—
10.9 +
186 -
Year
—
1987
Spectra
B9 III
Colors
W
?
Notes:
AB 1920: 10.7 @ 187. 3 measurements.
The Tycho-2 Catalogue indicates a single star entry.
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 18.6 inches.
Separation: AB = 1.85 miles.
Distance (LY): 109
Total luminosity (Suns): 0.455
Moderate
h4962
AC = Hough 647; HD 159176; SAO 208977
Rating: 4 M
Position: 1735-3235
A
B
C
Magnitude
5.69
10.50
9.94
Separation
—
5.2 +
13.3 +
PA
—
102 +
83 -
Year
—
1933
1907
Spectra
O5e V
Colors
W
?
?
Notes:
AB 1836: 5.0 @ 99. 9 measurements.
AC 1893: 13.2 @ 85. 2 measurements.
Central star of cluster NGC 6383, and a spectroscopic binary with a period of 3.366
days. Each star has about 30 solar masses. This system dominates the star cluster NGC
6383 and may, in fact, been the trigger that started the formation of the other stars.
- 33 -
Zone 267
Even the faint companions are both 10 times brighter than the Sun.
Observations:
C8 at 280x. This is the central star of the cluster NGC 6383.
Star A overpowers the system. Note the jagged line of six 9m stars about 5 min W.
Moderate field.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 24 inches.
Separation: AB = 27.6 miles; AC = 70.6 miles.
Distance (LY): 3,400
Total luminosity (Suns): 5,018
Difficult
Harvard 280
RY Sco; HD 162102; SAO 209340
Rating: 5 D
Position: 1751-3342
A
B
C
Magnitude
8.00
11.89
8.01
Separation
—
2.0 14.4 -
PA
—
102 +
219 +
Year
—
1964
1991
Notes:
AB 1897: 3.5 @ 90. 4 measurements.
AC 1897: 15.0 @ 215. 9 measurements.
A is a Cepheid, spectrum also variable.
Observations:
C8 at 516x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 21 feet; B = 27.0 inches.
Separation: AB = 3,430 feet; AC = 4.74 miles.
Distance (LY): 211
Total luminosity (Suns): 2.5
- 34 -
Spectra
F6 Ib
G7
Colors
yW
?
?
Zone 267
Deep Sky Objects
Easy
NGC 6405
Rating: 1 E
Other Names: Melotte 178; Collinder 341; Raab 122; Butterfly Cluster, M6
Astronomical Leage Program: Messier Club, Urban Deep Sky Club, Messier Binocular
Club
Position: 1740-3213
Type: Oc
Dimensions: 14'
Class: II 3r
Cluster population: 132
Magnitude: 4.2
Notes:
It was discovered by de Cheseaux in 1745 or 1746 and described it as a "fine cluster".
Lacaille included it in his list of 1755, having observed it in 1752.
Messier added it to his list on May 23, 1764. He said, "To the naked eye, it appears as
a nebulosity without a star, but even the smallest instrument reveals it as a cluster of
small stars."
This cluster is 100 million years old and 9
light years in diameter and lies 26,000 light years
from the galactic center and just beneath its plane.
The brightest stars (other than BM Sco) are all B
types just ready to leave the Main Sequence.
Observations:
C8 at 104x. Exquisite! The "butterfly" is
obvious. The brightest star is the orange giant
variable BM Sco (6.2m) in the NE quadrant.
(The second brightest star, HD 160202, is a flare
star that had a 5m increase in 40 minutes in
1965!) Steve Coe adds that two streamers of stars
seem to form the "antennae" of the butterfly.
14x70 Binos. Wonderful object! Small in the
binos, but the "butterfly" is still evident.
NGC 6405 (M6)
Open cluster (II 3 r; 132 stars)
Observed with C8 on 7/6/95
Magnification: 104x
Model (where the Sun is a baseball):
Its diameter would be 1,700 miles with stars 168 miles apart.
Distance (LY): 1,590
Luminosity (suns): 4,100
- 35 -
Zone 267
NGC 6475
Rating: 2 E
Other Names: Melotte 183; Collinder 354; Raab 125, M7
Astronomical Leage Program: Messier Club, Urban Deep Sky Club, Messier Binocular
Club
Position: 1754-3449
Type: Oc
Dimensions: 80'
Class: I 3r
Cluster population: 80
Magnitude: 5.0
Notes:
It was known by Ptolemy (in the Almagest), as well as being shown by the Tatar
Ulugh-begh (grandson of Tamerlane) in a star atlas he created in 1437. De Cheseaux put
it on his 1746 list, and Bode his 1779 list.
It was cataloged by Messier on May 23, 1764. He described it as "larger than the
preceding [M6]; this cluster appears to the naked eye as a nebulosity." It is his
southernmost object.
This cluster is 260 million years old; the earliest spectral type is B5. It also contains 5
Ap stars and 3 Am stars. The B stars are just beginning to leave the Main Sequence. The
brightest star is 7m.
It lies 27,000 light years from the galactic
center and 60 light years below the galactic
plane.
Observations:
C8 at 83x. Contains mostly B and W stars
arranged along two bars, with a nice doublet at
the center. A dO star is SW of the center, and a
sideways "K" patter is obvious. A dark nebula
appears to lie in the background.
14x70 Binos. Much poorer than M6, but
still a fair view.
Model (where the Sun is a baseball):
Its diameter would be 5,990 miles with stars
1,420 miles apart.
Distance (LY): 800
Luminosity (suns): 512
- 36 -
NGC 6475 (M7)
Open cluster (I 3 r; 80 stars)
Observed with C8 on 7/5/92
Magnification: 80x
Zone 267
NGC 6383
Other Names: Collinder 335
Rating: 5 E
Position: 1735-3234
Type: Oc
Dimensions: 5'
Class: II 3mn
Cluster population: 40
Magnitude: 5.5
Notes:
The age is given as 4 million years, although the H-R diagram suggests much older—
perhaps 35 million years. The youngest star type, O7, is in keeping with the younger age.
The brightest star is 5.6m.
This cluster lies 23,000 light years from the galactic center and right in the galactic
plane.
Observations:
C8 at 83x. Sparse. It contains a neat doublet, though (h4962, 2" @ 80; both W and
6m). The nebula that enshrouds it may be a supernova remnant.
Model (where the Sun is a baseball):
Its diameter would be 2,110 miles with stars 311 miles apart.
Distance (LY): 3,200
Luminosity (suns): 5,050
NGC 6416
Other Names: Collinder 344
Rating: 5 E
Position: 1744-3221
Type: Oc
Dimensions: 18'
Class: III 2m
Cluster population: 40
Magnitude: 5.7
Notes:
This cluster is 122 million years old, with the earliest spectral type being A0. At least
300 stars are known to be members, and it lies 25,000 light years from the galactic center
and 70 light years beneath the galactic plane.
The brightest star is 8.4m.
- 37 -
Zone 267
Observations:
C8 at 83x. Faint, and with a keystone pattern. It dangles like a cluster of grapes from
two brighter field stars.
Model (where the Sun is a baseball):
Its diameter would be 4,380 miles with stars 640 miles apart.
Distance (LY): 2,420
Luminosity (suns): 2,400
Moderate
NGC 6425
Position: 1747-3132
Type: Oc
Dimensions: 7'
Rating: 4 M
Class: I 1p
Cluster population: 35
Magnitude: 7.2
Notes:
This cluster is 22 million years old, and it lies 25,000 light years from the galactic
center and 75 light years below the galactic plane.
The brightest star is 10.2m.
Observations:
C8 at 83x. Faint and misty. High power is a good idea here.
Model (where the Sun is a baseball):
Its diameter would be 1,900 miles with stars 290 miles apart.
Distance (LY): 2,540
Luminosity (suns): 670
NGC 6451
Rating: 4 M
Other Names: Melotte 181; Collinder 352; Raab 123; Tom Thumb Cluster, H VI 13
Astronomical League Program: Herschel 400 Club
Position: 1751-3013
Type: Oc
Dimensions: 7'
Class: I 2rn
Cluster population: 80
- 38 -
Magnitude: 8.2
Zone 267
Notes:
The galaxy's center, Sagittarius A+, lies 2o NW of here, but offers nothing visually,
due to obscuring dust.
This cluster is 136 million years old, and it lies virtually in the galactic plane (but
26,000 light years from its center).
The brightest cluster star is 12m.
Observations:
C8 at 83x. Delicate and scintillating. Dean Williams makes mention of it being
"oddly shaped" but does not go on to say what that means. I saw nothing unusual about
the shape myself other than a roughly triangular shape.
Model (where the Sun is a baseball):
Its diameter would be 1,220 miles with stars 284 miles apart.
Distance (LY): 6,780
Luminosity (suns): 1,900
Trumpler 27
Other Names: Liller 1; Collinder 336
Rating: 5 M
Position: 1734-3326
Type: Oc
Dimensions: 8'
Class: I 2p
Cluster population: 35
Magnitude: 9.1
Notes:
This cluster is 10 million years old. The brightest star is 8.4m.
It is dimmed 3 to 8 magnitudes by dust. This dimming is called "extinction" in
astronomy and is measured by what is called the "color excess" of the stars in question.
The color excess is defined as
E = (B - V) - (B - V)o
where (B - V) is the observed color index and (B - V)o is the intrinisic color index.
Observations:
C8 at 83x. Sparse and open. I counted 12 stars.
Distance (LY): 3,950
Luminosity (suns): 280
- 39 -
Zone 267
Zone 267, Map 6
Double Stars
Easy
Russell 306
AC = See 343; HD 163482; SAO 209525
Rating: 3 E
Position: 1758-3600
A
B
C
Magnitude
6.76
10.07
12.80
Separation
—
3.5 +
11.6 +
PA
—
17 +
102 +
Year
—
1991
1965
Spectra
A0 III
Colors
Y
dO?
?
Notes:
AB 1880: 2.6 @ 15. 12 measurements.
AC 1896: 11.0 @ 97. 4 measurements.
Observations:
C8 at 280x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 19.2 inches.
Separation: AB = 2.29 miles; AC = 7.62 miles.
Distance (LY): 421
Total luminosity (Suns): 29
h5000
V1647 Sgr; HD 163708; SAO 209552
Rating: 3 E
Position: 1759-3656
A
B
Magnitude
7.16
9.02
Separation PA
—
—
7.6 +
103 -
- 40 -
Year
—
1991
Spectra
A3 III
Colors
yW
rO
Zone 267
Notes:
1834: 6.0 @ 117. 13 measurements.
A is an Algol-type system.
Observations:
C8 at 83x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 8.40 inches.
Separation: AB = 4.43 miles.
Distance (LY): 374
Total luminosity (Suns): 16.2
Dunlop 219
Rating: 3 E
HD 163652; SAO 209545
Position: 1759-3651
A
B
Magnitude
5.74
8.19
Separation PA
—
—
52.7 +! 255 -
Year
—
1991
Notes:
AB 1826: 30.0 @ 263. 15 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 = 39 inches; B = 10.6 inches.
Separation: AB = 30.0 miles.
Distance (LY): 365
Total luminosity (Suns): 60
- 41 -
Spectra
G5 III
F0
Colors
W
dB!!
Zone 267
Cordoba 216
Bos 915; HD 159632; SAO 209038
Rating: 4 E
Position: 1738-3747
A
B
Magnitude
7.65
8.64
Separation PA
—
—
13.9 +
194 +
Year
—
1991
Spectra
F0 V
Colors
Y
pB
Notes:
1912: 13.7 @ 193. 8 measurements.
Observations:
C8 at 83x. It lies on the SW edge of the sparse open cluster Collinder 338.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 5.70 inches.
Separation: AB = 2.81 miles.
Distance (LY): 130
Total luminosity (Suns): 1.4
Bos 921
Rating: 4 E
HD 161911; SAO 209320
Position: 1750-3732
A
B
C
Magnitude
9.68
11.15
9.66
Separation
—
0.9 34.9 +
PA
—
132 96 -
Notes:
AB 1927: 1.0 @ 136. 4 measurements.
AC 1909: 33.6 @ 97. 7 measurements.
Observations:
C8 at 104x.
- 42 -
Year
—
1991
1967
Spectra
A2 V
G5
Colors
W
No
W
Zone 267
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 8.40 inches; C = 21.3 inches.
Separation: AB = 422 feet; AC = 3.32 miles.
Distance (LY): 61
Total luminosity (Suns): 0.08
Lambda Sco
Rating: 5 E
35 Sco; Shaula, "the stinger"; Dunlop 218 (C); See 334; HD 158926; SAO 208954
Position: 1734-3706
A
B
C
Magnitude
1.62
14.90
9.24
Separation
—
41.7
95.0 +!!
PA
—
109
330 -!
Year
—
1897
1986
Spectra
B1.5 IV
Colors
bW
No
W
Notes:
AB 1 measurement.
AC 1826: 60.0 @ 34. 5 measurements.
This sub-giant is a spectroscopic binary (5.6 day period). The system emits X-rays
and belongs to the Sco-Cen Association.
The other stinger star, Upsilon Sco, is called Lesath, another Arabic word for
"stinger", and is also a spectroscopic binary. It lies 540 light years away and is a B2 subgiant.
From James Kaler's Star Notes:
Though the stinger stars appear close together, only half a degree apart, they are not a
real couple, Shaula lying at a distance of 700 light years, Lesath closer at 520. However
both stars and several others in southern Scorpius do belong to the huge nearby "Scorpius
OB1 association," an expanding disintegrating group of hot stars that were all born about
the same time.
Shaula is a hot class B star with a temperature around 25,000 Kelvin, over four times
hotter than the Sun. Shaula, however, is a close double made of roughly similar hot stars
with an orbital period of 5.9 days. There seems to be a third, more distant companion as
well, about which nothing is known (showing how little we understand some stars).
Shaula is an unusually strong source of low-energy X-rays, which also suggests a third
component, possibly a white dwarf.
Shaula is classed as a "subgiant," telling us that hydrogen fusion in the core of the
main component is shutting down or has shut down altogether. With a mass around 11
times that of the Sun, the star may explode or more likely turn into a rare, heavy white
dwarf, possibly one with a neon-oxygen core. Like Mirzam, Shaula is a subtle variable of
- 43 -
Zone 267
the "Beta Cephei" type, changing its brightness by less than a tenth of a magnitude with
two periods of 0.21 and 0.11 days going on at the same time, the variation the result of
internal structural changes that no one understands very well.
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 14.4 inches.
Separation: AB = 45.6 miles; AC = 104 miles; Aa = 1.71 feet.
Distance (LY): 700
Total luminosity (Suns): 35,000
Moderate
Howe 87
Rating: 4 M
SAO 208903
Position: 1732-3901
A
B
Magnitude
7.14
8.80
Separation PA
—
—
3.2 +
232 +
Year
—
1991
Notes:
1876: 2.0 @ 230. 12 measurements.
Observations:
C8 at 280x. It forms the NE vertex of an 8m triangle.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 4.20 inches.
Separation: AB = 1.43 miles.
Distance (LY): 288
Total luminosity (Suns): 11.4
- 44 -
Spectra
F6 V
Colors
yW
?
Zone 267
Cordoba 222
Rating: 5 M
HD 163195; SAO 209497
Position: 1757-3956
A
B
Magnitude
7.28
8.26
Separation PA
—
—
3.5 123 +
Year
—
1991
Spectra
K2 III
Colors
Y
?
Notes:
AB 1880: 4.0 @ 120. 11 measurements.
Observations:
C8 at 280x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 49.5 inches.
Separation: AB = 43.7 miles.
Distance (LY): 8,000
Total luminosity (Suns): 7,060
Deep Sky Objects
Easy
Trumpler 30
Other Names: Collinder 355; Harvard 18
Rating: 4 E
Position: 1757-3519
Type: Oc
Dimensions: 15'
Class: III 2p
Cluster population: 80
Notes:
This cluster is 204 million years old.
- 45 -
Magnitude: 8.7
Zone 267
Observations:
C8 at 83x. Faint and rich. The stars on the W edge are brighter, and note the acute
triangle on the SW edge.
Distance (LY): 3,260
Total luminosity (Suns): 275
Moderate
NGC 6441
Position: 1750-3703
Type: Gc
Dimensions: 3'
Rating: 4 M
Class: 3
Magnitude: 8.0
Notes:
It was discovered on May 13, 1826 by James Dunlop.
The brightest stars are 15.4m and the horizontal branch is 17.1m.
It is dimmed 3 magnitudes by dust.
NGC 6441 is one of only four known globular clusters which currently house
planetary nebulae. This particular planetary was not discovered until 1997.
Observations:
C8 at 65x. Unresolved, but it magnifies well. A foreground star (G Sco) is very bad
for the seeing. High powers work well, but show little that's new.
Model (where the Sun is a baseball):
Its diameter would be 9,550 miles.
Distance (LY): 38,100
Luminosity (suns): 1,100,000
Difficult
NGC 6400
Other Names: Melotte 177; Collinder 342; Raab 121
Rating: 4 D
Position: 1741-3657
Type: Oc
Dimensions: 7'
Class: II 2m
Cluster population: 60
- 46 -
Magnitude: 8.8
Zone 267
Notes:
The cluster is 603 million years old.
The brightest member is 9.0m.
Observations:
C8 at 104x. Very low surface brightness, and not resolved.
Distance (LY): 3,100
Total luminosity (Suns): 227
NGC 6380
Position: 1734-3904
Type: Gc
Rating: 5 D
Dimensions: 2'
Notes:
John Herschel discovered this cluster from the Cape of Good Hope on June 29, 1834.
The horizontal branch is 18.0m.
Observations:
C8 at 83x. It was not resolved. A bright star (9m) lies just S and makes the view
difficult.
Model (where the Sun is a baseball):
Its diameter would be 5,240 miles.
Distance (LY): 34,900
Total luminosity (Suns): 2,900
- 47 -
Zone 267
Zone 267 Mini-Catalog
Double Stars
Designation
Position
Rating
Map
36 Oph
1715-2636
1E
1
South 385
1718-2638
2E
1
Howe 85
1707-3553
3E
3
Holden 28
1725-3032
3E
2
Stone 37
1751-3033
3E
5
Innes 1343
1752-2654
3E
4
Russell 306
1758-3600
3E
6
Dunlop 219
1759-3651
3E
6
h5000
1759-3656
3E
6
h5003
1759-3015
3E
5
h4926
1714-3946
4E
3
Howe 39
1730-3343
4E
2
Cordoba 215
1735-3149
4E
5
Cordoba 216
1738-3747
4E
6
Argelander 30
1743-2955
4E
4
See 337
1746-2804
4E
4
Cordoba 221
1749-3200
4E
5
Bos 921
1750-3732
4E
6
Bos 359
1751-2917
4E
4
Component
A
B
C
D
A
B
A
B
A
B
A
B
A
B
A
B
C
A
B
A
B
A
B
C
A
B
C
A
B
C
D
A
B
A
B
A
B
A
B
A
B
A
B
C
A
B
- 48 -
Mag
4.33
4.34
6.33
7.63
7.09
8.60
7.66
8.21
8.52
9.15
6.70
8.09
8.34
9.97
6.76
10.07
12.80
5.74
8.19
7.16
9.02
5.30
6.85
13.10
6.42
10.02
10.38
6.68
9.60
11.50
9.39
9.23
9.69
7.65
8.64
8.68
9.39
8.60
10.30
8.78
9.89
9.68
11.15
9.66
8.33
10.49
Separation
—
4.7 731.8 272.3 +!
—
6.0
—
5.0 -!!
—
3.6 +
—
10.1 +
—
17.4 =
—
3.5 +
11.6 +
—
52.7 +!
—
7.6 +
—
5.5 26.0 —
14.2 +
16.9 +
—
4.4 +
14.6 59.0 +
—
8.1 +
—
13.9 +
—
36.0 —
9.9 74.3 —
9.2 —
0.9 34.9 +
—
46.9 +
PA
—
148 -!
731.8 272.3 +!
—
335 +?
—
23-!!
—
233 —
190 +
—
159 +
—
17 +
11.6 +
—
255 —
103 —
105 26.0 —
334 =
16.9 +
—
320 =
14.6 59.0 +
—
357 —
194 +
—
291 —
874.3 —
308 —
132 34.9 +
—
340 +
Zone 267
Designation
Position
Rating
Map
Howe 40
1752-2828
4E
4
h4991
1753-2639
4E
4
Perth Obs 183
1754-3228
4E
5
h4915
1705-3753
5E
3
h4919
1708-2835
5E
1
h4921
1709-3140
5E
2
Hough 413
1722-3012
5E
2
Lambda Sco
1734-3706
5E
6
Howe 96
1741-3245
5E
5
Cordoba 219
1744-3256
5E
5
Bur 127
1721-2720
2M
1
Cordoba 205
1701-2824
3M
1
Bur 128
1727-2620
3M
1
Hough 554
1701-2941
4M
1
Harvard 266
1706-3714
4M
3
Howe 86
1714-3818
4M
3
Howe 87
1732-3901
4M
6
h4962
1735-3235
4M
5
Perth Obs 162
1728-3112
5M
2
Bos 348
1737-2859
5M
4
Stone 36
1744-2727
5M
4
Cordoba 222
1757-3956
5M
6
Bur 125
1712-2703
4D
1
Component
A
B
C
D
A
B
A
B
A
B
A
B
A
B
C
A
B
A
B
C
A
B
A
B
A
B
A
B
A
B
A
B
C
A
B
C
A
B
A
B
A
B
C
A
B
A
B
A
B
A
B
A
B
C
- 49 -
Mag
8.27
10.50
12.94
12.00
9.96
10.02
7.79
10.50
7.97
11.30
8.64
11.42
8.85
9.36
13.20
8.02
11.36
1.62
14.90
9.24
8.40
10.30
8.51
10.10
7.94
8.05
8.22
8.72
7.35
9.70
8.02
12.90
11.44
5.98
10.54
13.41
6.74
8.72
7.14
8.80
5.69
10.50
9.94
7.73
12.34
9.01
10.62
8.74
10.88
7.28
8.26
6.75
9.44
13.00
Separation
—
6.9 +
12.7 +
20.2
—
23.2 +
—
5.7 —
11.4 +
—
22.6 +
—
8.7 +
20.6
—
16.2 +
—
41.7
95.0 +!!
—
5.5 +
—
10.9 +
—
5.3 =
—
2.6 —
4.0 =
—
9.8 36.0 +
—
5.9 43.3 +!
—
2.7 +
—
3.2 +
—
5.2 +
13.3 +
—
14.4
—
5.2 =
—
8.3 +
—
3.5 —
1.8 +
77.7
PA
—
11 =
12.7 +
20.2
—
359 =
—
334 +
—
337 —
264 —
146 +
20.6
—
309 +
—
109
95.0 +!!
—
246 +
—
186 —
91 —
75 —
323 +
—
359 36.0 +
—
80 43.3 +!
—
146 +
—
232 +
—
102 +
13.3 +
—
120
—
214 —
205 —
123 +
—
66 =
77.7
Zone 267
Designation
Position
Rating
Map
h4935
1719-3459
4D
2
Innes 1002
1723-2740
4D
1
Cordoba 209
1713-3321
5D
2
h4986
1750-2620
5D
4
Harvard 280
1751-3342
5D
5
Component
A
B
C
D
A
B
A
B
A
B
C
D
A
B
C
Mag
5.91
6.33
9.60
12.90
8.56
8.77
7.85
10.06
8.14
11.30
12.20
12.19
8.00
11.89
8.01
Separation
—
2.1 +
31.5 +
20.8 -!!
—
3.5 +
—
10.4 +
—
10.8 22.9
27.2
—
2.0 14.4 -
PA
—
272 +
31.5 +
20.8 -!!
—
38 +
—
138 —
227 22.9
27.2
—
102 +
14.4 -
Deep Space Objects
Object
NGC 6405
NGC 6266
NGC 6281
NGC 6475
NGC 6273
Trumpler 30
NGC 6383
NGC 6416
NGC 6293
Collinder 347
NGC 6425
NGC 6441
NGC 6451
NGC 6302
NGC 6316
Trumpler 27
NGC 6304
Trumpler 26
NGC 6400
NGC 6256
NGC 6355
NGC 6380
Palomar 6
Position
1740-3213
1701-3007
1705-3754
1754-3449
1703-2616
1757-3519
1735-3234
1744-3221
1710-2635
1746-2918
1747-3132
1750-3703
1751-3013
1714-3700
1717-2808
1734-3326
1715-2928
1729-2929
1741-3657
1700-3707
1724-2621
1734-3904
1744-2613
Rating
1E
2E
2E
2E
3E
4E
5E
5E
4M
4M
4M
4M
4M
5M
5M
5M
4D
4D
4D
5D
5D
5D
5D
Map
5
2
3
5
1
6
5
5
1
4
5
6
5
3
1
5
1
1
6
3
1
6
4
Type
Oc (II 3r)
Gc (4)
Oc (II 2pn)
Oc (I 3r)
Gc (8)
Oc (III 2p)
Oc (II 3mn)
Oc (III 2m)
Gc (4)
Oc (III 2pn)
Oc (I 1p)
Gc (3)
Oc (I 2rn)
Gn (6)
Gc (3)
Oc (I 2p)
Gc (6)
Oc (III 2p)
Oc (II 2m)
Gc
Gc
Gc
Gc (11)
- 50 -
Specifications
Surface
Mag
Br
4.2
6.5
5.4
5.0
6.8
8.7
5.5
5.7
8.8
8.8
7.2
8.0
8.2
—
9.9
9.1
9.2
9.0
8.8
11.2
9.8
—
11.6
Population
132
25
80
80
40
40
40
35
80
35
40
60