Zone 171, Master Map
α1
α2
+14°00'
+16°00'
Normal View
Zone Master, Normal View, 10 deg FOV
Rasalgethi
Octans
Hercules
e
c
+12°00'
Rasalhague
+10°00'
α
d
+06°00'
f
+08°00'
κ
β
Cebalrai
σ
18h 00m
17h 52m
17h 44m
17h 36m
17h 28m
17h 20m
17h 12m
17h 04m
Zone 171, Map 1
Normal Image
H IV 122
STF 2115
+14°00'
Rasalgethi
α1
α2 Alpha Her
+15°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
Octans
SI 33
Hercules
+13°00'
STF 2159
60 Her
IC 1255
+12°00'
A. G. 353
+11°00'
NGC 6368
STF 2166
Bur 357
STF 2170
STF 2143 rej
17h 30m
17h 25m
17h 20m
17h 15m
17h 10m
17h 05m
17h 00m
Zone 171, Map 1
Mirror Image
+15°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
STF 2115
H IV 122
Rasalgethi
Alpha Her
+14°00'
α1
α2
Octans
SI 33
60 Her
STF 2159
+13°00'
Hercules
IC 1255
+12°00'
A. G. 353
NGC 6368
+11°00'
STF 2166
Bur 357
STF 2143 rej
17h 00m
17h 05m
17h 10m
17h 15m
17h 20m
17h 25m
17h 30m
Zone 171, Map 2
Normal Image
+10°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
STF 2143 rej
+09°00'
OS 326
STF 2113
+06°00'
STF 2123
+07°00'
+08°00'
STF 2114
Pourteau 3293
Baillaud 2889
17h 30m
17h 25m
Schjellerup 14
Baillaud 2888
17h 20m
17h 15m
17h 10m
17h 05m
17h 00m
Zone 171, Map 2
Mirror Image
+10°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
STF 2143 rej
STF 2111 rej
+09°00'
OS 326
+08°00'
STF 2114
+07°00'
STF 2113
+06°00'
STF 2123
Schjellerup 14 Baillaud 2889
Baillaud 2888
17h 00m
17h 05m
17h 10m
17h 15m
17h 20m
17h 25m
17h 30m
Zone 171, Map 3
Normal Image
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
+15°00'
OS 332
Jonckheere 2115
STF 2222
STF 2217
STF 2253
+14°00'
h1303
+13°00'
h1306
54 Oph
Alpha Oph
Rasalhagueα
+12°00'
STF 2231 rej
+11°00'
Barton 1287
OSS 160
A. G. 355
STF 2176
A. G. 356
18h 00m
17h 55m
17h 50m
17h 45m
17h 40m
17h 35m
17h 30m
Zone 171, Map 3
Mirror Image
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
Jonckheere 2115
STF 2217
+15°00'
Glasenapp 7
STF 2222
STF 2253
+14°00'
h1303
+13°00'
h1306
54 Oph
Alpha Oph
α
Rasalhague
+12°00'
STF 2231 rej
+11°00'
Barton 1287
OSS 160
A. G. 355
STF 2170 STF 2176
A. G. 356
17h 30m
17h 35m
17h 40m
17h 45m
17h 50m
17h 55m
18h 00m
Zone 171, Map 4
Normal Image
+10°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
53 Oph
+09°00'
STF 2228
OSS 161
STF 2230
NGC 6384
NGC 6384
+07°00'
+08°00'
STF 2193
STF 2188
NGC 6509
STF 2185
IC 4665
STF 2216 rej
STF 2212 STF 2200
+06°00'
NGC 6378
IC 4665
STF 2227
A. G. 212
STF 2223 rej
18h 00m
Barnard's Star
17h 55m
17h 50m
17h 45m
17h 40m
17h 35m
17h 30m
Zone 171, Map 4
Mirror Image
+10°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
53 Oph
+09°00'
STF 2228
+08°00'
STF 2193
+07°00'
STF 2230
NGC 6384 NGC 6384
STF 2188
+06°00'
NGC 6509
STF 2185
STF 2200 STF 2212
IC 4665
IC 4665
STF 2227
A. G. 212
STF 2223 rej
Pourteau 3293
17h 30m
STF 2216 rej
17h 35m
17h 40m
17h 45m
17h 50m
17h 55m
18h 00m
Zone 171
1 Reference Star, 39 Double Stars,
1 Open Cluster, 2 Galaxies
Flamsteed
O
53 Oph ................................................. 19
54 Oph ................................................. 16
60 Her .................................................... 6
OS 326 ................................................... 9
OSS 160 ............................................... 14
A
SI 33 ....................................................... 5
STF 2113................................................ 8
STF 2114.............................................. 10
STF 2115................................................ 4
STF 2123................................................ 9
STF 2143 rej .......................................... 4
STF 2159................................................ 5
STF 2166................................................ 2
STF 2170................................................ 6
STF 2176.............................................. 12
STF 2185.............................................. 20
STF 2188.............................................. 22
STF 2193.............................................. 18
STF 2200.............................................. 19
STF 2212.............................................. 24
STF 2216 rej ........................................ 22
STF 2217.............................................. 13
STF 2222.............................................. 16
STF 2227.............................................. 23
STF 2228.............................................. 21
STF 2230.............................................. 23
STF 2231 rej ........................................ 14
STF 2253.............................................. 15
S
A. G. 212 ............................................. 21
A. G. 353 ............................................... 7
A. G. 355 ............................................. 13
A. G. 356 ............................................. 12
Alpha Her .............................................. 2
Alpha Oph............................................ 11
B
Barton 1287 ......................................... 18
Bur 357 .................................................. 7
H
h1303 ................................................... 17
h1306 ................................................... 15
I
IC 4665 ................................................ 24
J
Jonckheere 2115 .................................. 17
N
NGC 6384............................................ 26
NGC 6509............................................ 25
-1-
Zone 171
Zone 171, Map 1
Double Stars
Easy
STF 2166
Rating: 2 E
ADS 10562; HD 158263; SAO 102833
Position: 1728+1123
A
B
Magnitude
7.11
8.62
Separation PA
—
—
27.5 =
282 -
Year
—
1992
Spectra
A3 V
A3
Colors
W
B
Notes:
1831: 27.5 @ 283. 41 measurements. The stars show similar proper motions.
Observations:
C8 at 65x. Webb saw them as W and bW. Very, very rich field.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 8.10 inches; B = 7.70 inches.
Separation: AB = 13.5 miles.
Distance (LY): 315
Total luminosity (Suns): 14
Alpha Her
Rating: 3 E
64 Her; Ras Algethi, "the kneeler's head"; STF 2140; ADS 10418; HD 156014; SAO
102680
Position: 1715+1423
A
B
C
Magnitude
2.78
5.12
11.10
Separation
—
4.8 +
81.0 -
PA
—
105 39 =
-2-
Year
—
1999
1995
Spectra
M5 III
G5
Colors
O
G
?
Zone 171
Notes:
AB 1829: 4.7 @ 116. Over 100 measurements. The orbit is believed to take about
3,600 years (Baize, 1978)!
AC 1878: 85.4 @ 39. 11 measurements. The stars share common proper motion.
The primary is a semi-regular variable discoverd by William Herschel (1779), and has
a 90 day period. It is a huge red giant, 400 times as big as the Sun and 14 times as
massive, but only 0.0000001 times as dense. Its surface temperature is only 2,650o K. In
fact, most of its energy is radiated in the infra-red. It is also belching out a tenuous shell
of matter that is so large it actually engulfs the B star, extending some 200,000 solar
radii! This shell is expanding at 10 kps and is fed at the rate of 3 x 10-8 solar masses per
year— a real gusher in astronomical terms! Its diameter has been measured as 0.025".
The B star is actually a very close binary with a 51.59 day period and a nearly circular
orbit. (Circular orbits among binaries imply old age. The companion is an F2 star, so it
must have evolved faster than the G5 primary.)
From James Kaler's Star Notes:
The name means "the Kneeler's Head", in reference to an early name for the
constellation, the figure of the man seen upside down, his head toward the south.
Though of the third magnitude as seen from Earth, the star itself is magnificent, a
reddish giant or even supergiant with a surface temperature of about 3,000 degrees
Kelvin. It varies irregularly in its brightness by about a magnitude over a period of years.
Factoring in the infrared radiation that we cannot see from the cool star would make it
almost 15 times brighter yet. True to its class, the star has a radius that is twice the
distance between the Earth and Sun, which if placed here would take it well out past the
orbit of Mars.
Rasalgethi is a complex multiple star that through the telescope has a fifth magnitude
companion five seconds of arc away. This secondary is itself a double that consists of a
giant star about the temperature of the Sun and a more solar-like star somewhat hotter
than the Sun in orbit around each other with a 52 day period. The bright supergiant is
blowing a powerful wind that is so strong that the cloud of gas expanding around it has
enveloped the companion, which is at least 550 astronomical units away from the
supergiant, 275 times the supergiant's size and 14 times the dimension of our whole
planetary system. Rasalgethi appears to be losing mass at a rate of about a ten-millionth
of a solar mass per year, hardly a record, but substantial enough, consistent with its being
a highly distended supergiant.
Observations:
C8 at 65x. Star C is very difficult. Some observers report W and bW for AB. Webb
said Y! and B! Others report yO and bG (but not certain), D and pG-B ("A spectacular
pair!" wrote Tom Teague of England), Y and pG, dY and bG or dYO and dB, dY and G.
Hartung said O and W.
-3-
Zone 171
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 100 feet; B = 15.5 inches.
Separation: AB = 3.07 miles; AC = 51.8 miles; Bb = 7.28 feet.
Distance (LY): 410
Total luminosity (Suns): 760
STF 2115
V451 Her; ADS 10310; HD 153882; SAO 102536; H IV 122
Position: 1702+1457
A
B
Magnitude
6.29
10.21
Separation PA
—
—
19.0 =
237 -
Year
—
1958
Rating: 4 E
Spectra
B9pCrEuv
Colors
W
V
Notes:
1783: 19.0 @ 239. 16 measurements. Hipparcos/Tycho data show different
distances for these stars; they may be optical. A is an Alpha CVn variable.
Observations:
C8 at 104x. Very, very rich field.
C11 at 115x. B could have been pO.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 4.46 inches.
Separation: AB = 16.3 miles.
Distance (LY): 550
Total luminosity (Suns): 72
STF 2143 rej
Rating: 4 E
HD 156018; SAO 102683
Position: 1715+1000
A
B
Magnitude
9.06
11.03
Separation PA
—
—
28.6 119 -
Year
—
1991
Spectra
F8
G5
Colors
W
rO
Notes:
1900: 28.9 @ 120. 10 measurements. Hipparcos/Tycho data show different
distances for these stars; they may be optical. However, the stars show similar proper
motion.
-4-
Zone 171
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 15.9 inches; B = 22.8 inches.
Separation: AB = 100 miles.
Distance (LY): 2,250
Total luminosity (Suns): 116
STF 2159
Rating: 4 E
HD 157789
Position: 1725+1320
A
B
Magnitude
8.49
9.29
Separation PA
—
—
26.5 +
325 -
Year
—
1991
Spectra
F5
Colors
W
W
Notes:
1831: 26.3 @ 326. 31 measurements. Hipparcos/Tycho data show different
distances for these stars; they may be optical. The stars have different proper motions.
Observations:
C8 at 104x. Moderate field to the W.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 13.4 inches.
Separation: AB = 38.5 miles.
Distance (LY): 930
Total luminosity (Suns): 43
SI 33
Rating: 5 E
HD 154228; SAO 102564
Position: 1704+1336
A
B
b
Magnitude
5.90
6.10
10.00
Separation
—
299 =
151.9 -
PA
—
116 =
268 =
-5-
Year
—
1962
1918
Spectra
A1 V
K1 III
Colors
W
W
?
Zone 171
Notes:
AB 1835: 292.4 @ 115. 10 measurements. Hipparcos/Tycho data show different
distances for these stars; they may be optical.
Bb 1887: 152 @ 267.
This system is part of the Gamma Leo Group.
Observations:
C8 at 104x. I never found C, but did note a small 10m triangle just S of AB. Mary
Flanagan (Apple Valley, MN; 8" Dob)— B, O.
60 Her
Rating: 5 E
ADS 10334; HD 154494; SAO 102584; H V 133
Position: 1705+1244
A
B
Magnitude
4.88
10.35
Separation PA
—
—
58.7 +! 309 +
Year
—
1988
Spectra
A3 IV
Colors
W
W?
Notes:
1783: 48.7 @ 307. 14 measurements. The stars have different proper motions.
This star is a probable Eggen group member.
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 10.0 inches.
Separation: AB = 13.2 miles.
Distance (LY): 144
Total luminosity (Suns): 18.1
Moderate
STF 2170
Rating: 3 M
ADS 10575; SAO 102845
Position: 1729+1029
A
B
Magnitude
9.38
10.01
Separation PA
—
—
3.5 60 -
-6-
Year
—
1999
Spectra
G5
Colors
W
O
Zone 171
Notes:
1830: 3.8 @ 76. 43 measurements.
Observations:
C8 at 206x.
A. G. 353
Rating: 5 M
ADS 10350; SAO 102599
Position: 1707+1213
A
B
Magnitude
9.86
11.20
Separation PA
—
—
9.5 +
248 -
Year
—
1913
Spectra
F0
Colors
W
?
Notes:
1893: 8.7 @ 250. 3 measurements.
Observations:
C11 at 115x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 11.6 inches.
Separation: AB = 2.29 miles.
Distance (LY): 155
Total luminosity (Suns): 0.28
Difficult
Bur 357
Rating: 4 D
ADS 10336; HD 154517
Position: 1706+1033
A
B
Magnitude
8.26
9.72
Separation PA
—
—
1.4 +
308 +
Notes:
1876: 1.2 @ 295. 27 measurements.
Observations:
C11 at 634x.
-7-
Year
—
1991
Spectra
A5
Colors
W
pY
Zone 171
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 8.26 inches.
Separation: AB = 1.72 miles.
Distance (LY): 790
Total luminosity (Suns): 31
Zone 171, Map 2
Double Stars
Easy
STF 2113
Bur 1537 (C, D); ADS 10313; HD 153930; SAO 122025
Position: 1702+0713
A
B
C
D
Magnitude
8.25
10.25
13.60
12.80
Separation
—
4.9 +
18.1
40.5
PA
—
117 245
142
Year
—
1991
1911
1911
Rating: 4 E
Spectra
A3
Colors
W
dO
No
No
Notes:
AB 1832: 4.7 @ 119. 22 measurements.
AC, AD 1 measurement.
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 7.51 inches.
Separation: AB = 3.70 miles; AC = 13.7 miles; AD = 30.7 miles.
Distance (LY): 485
Total luminosity (Suns): 10
-8-
Zone 171
STF 2123
Rating: 5 E
HD 154734
Position: 1707+0648
A
B
Magnitude
9.84
9.88
Separation PA
—
—
18.3 216 -
Year
—
1993
Spectra
K0
Colors
Y
Y
Notes:
1830: 19.3 @ 218. 23 measurements. Hipparcos gives 216 light years to A and 245
to B.
Observations:
C8 at 104x. All I can say is thank heaven for setting circles! This is a dim pair in a
bleak field. It would be very hard to find by "star hopping."
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 27.0 inches.
Separation: AB = 6.16 miles.
Distance (LY): 216
Total luminosity (Suns): 0.83
Moderate
OS 326
Rating: 5 M
ADS 10454; HD 156615; SAO 122258
Position: 1718+0931
A
B
Magnitude
8.06
12.48
Separation PA
—
—
16.9 +
218 +
Notes:
1865: 15.4 @ 204. 9 measurements.
Observations:
C8 at 104x.
-9-
Year
—
1962
Spectra
A2
Colors
W
W?
Zone 171
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 7.09 inches.
Separation: AB = 12.5 miles.
Distance (LY): 473
Total luminosity (Suns): 10.17
Difficult
STF 2114
Rating: 4 D
ADS 10312; HD 153914; SAO 122023
Position: 1702+0827
A
B
Magnitude
6.75
7.67
Separation PA
—
—
1.3 186 +
Year
—
1998
Spectra
A4 V
Colors
Y
B
Notes:
1825: 1.5 @ 138. Over 100 measurements. Star A is a spectroscopic binary.
Observations:
C8 at 206x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 7.80 inches.
Separation: AB = 4,013 feet.
Distance (LY): 379
Total luminosity (Suns): 43
- 10 -
Zone 171
Zone 171, Map 3
Reference Star
Alpha Oph (55 Oph; Ras Alhague; HD 159561; SAO 102932)
Position: 1735+1234
Mag : 2.08
Spectrum : A5 III
Color : W
Assumed distance: 47 light years
Assumed luminosity (suns): 25
Notes:
This star is an infra-red source and rotates at 219 kps. It is also a spectroscopic binary
(8.5 year period) and a Delta Sct variable.
A cloud 1 parsec thick lies between us and Alpha, a member of the Ursa Major
Moving Stream.
From James Kaler's Star Notes:
Rasalhague itself embodies the constellation, the name coming from an Arabic phrase
meaning "the Head of the Serpent Collector."
Like so many stars, it is not alone, but has a faint, very close companion only half a
second of arc away that orbits with a period of 8.7 years. At Rasalhague's distance that
separation corresponds to an orbit with a radius of 7 Astronomical Units, about halfway
between the sizes of the orbits of Jupiter and Saturn. From the orbit, Rasalhague has a
mass somewhere between 2 and 4 times that of the Sun, the companion much less, not
much more than half a solar mass. More important and rather unusual, Rasalhague is just
a bit brighter than the other stars of its temperature (about 8,500 degrees Kelvin) and is
actually classed as a giant star rather than main sequence star like the Sun. Rasalhague
seems therefore to have recently run out internal hydrogen fuel and now is in the
beginning stages of dying with a contracting helium core. It is also, similar to many of its
class, slightly variable, though the effect is too subtle to be seen with the naked eye.
- 11 -
Zone 171
Double Stars
Easy
STF 2176
Guillaume 19 (C); ADS B8052; SAO 102878
Position: 1731+1027
A
B
C
Magnitude
9.40
10.20
9.53
Separation
—
16.5 89.9 -
PA
—
14 +
251 =?
Rating: 3 E
Year
—
1961
1991
Spectra
K0
Colors
O
R
No
Notes:
AB 1829: 16.9 @ 9. 12 measurements. The stars have different proper motions.
AC 1991: 90.5 @ 71. 14 measurements. Quadrant reversal?
Observations:
C8 at 104x. Very rich field.
A. G. 356
Rating: 3 E
ADS 10778; SAO 103089
Position: 1746+1019
A
B
Magnitude
9.50
10.45
Separation PA
—
—
13.0 +! 213 +!
Year
—
1991
Spectra
F0
Colors
W
rO
Notes:
1893: 7.6 @ 185. 5 measurements.
This pair may be optical as Hipparcos shows different distances (429 and 64 light
years).
Observations:
C11 at 115x.
- 12 -
Zone 171
STF 2217
Rating: 3 E
ADS 10784; HD 161729; SAO 103095
Position: 1747+1447
A
B
C
Magnitude
8.06
8.18
12.70
Separation
—
7.0 +
25.4
PA
—
284 304
Year
—
1991
1915
Spectra
G0
Colors
Y
Y
W?
Notes:
AB 1830: 6.6 @ 285. 58 measurements.
AC 1 measurement.
Observations:
C8 at 104x. Nice effect; averted vision needed for C.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 17.0 inches.
Separation: AB = 5.30 miles; AC = 19.3 miles.
Distance (LY): 486
Total luminosity (Suns): 15.07
A. G. 355
Position: 1732+1040
A
B
Magnitude
9.36
10.57
Rating: 4 E
Separation PA
—
—
22.6 +
333 -
Year
—
1991
Spectra
F2
Colors
W
B
Notes:
1894: 22.5 @ 334. 7 measurements. May be optical because Hipparcos gives
different distances (161 and 190 light years).
Observations:
C8 at 104x. The field to the S is very rich!
- 13 -
Zone 171
STF 2231 rej
Rating: 4 E
SAO 103148
Position: 1751+1213
A
B
Magnitude
8.90
10.90
Separation PA
—
—
32.2 153 +
Year
—
1905
Spectra
K0
F2
Colors
O
W?
Notes:
1902: 32.7 @ 152. 2 measurements. The stars show a similar, but small, proper
motion.
Observations:
C8 at 104x. Is the W vertex of a 9m triangle (the S vertex is also a double star).
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 25.6 inches; B = 13.6 inches.
Separation: AB = 136 miles.
Distance (LY): 2,700
Total luminosity (Suns): 225
OSS 160
Rating: 4 E
HD 162973; SAO 103181
Position: 1753+1058
A
B
Magnitude
8.39
9.63
Separation PA
—
—
101.6 190 -
Year
—
1995
Spectra
B8
Colors
W
W
Notes:
1900: 102.2 @ 191. 5 measurements.
May be optical because Hipparcos gives different distances (1,040 and 429 light
years).
Observations:
C8 at 104x.
- 14 -
Zone 171
h1306
Rating: 4 E
HD 162951; SAO 103176
Position: 1753+1401
A
B
Magnitude
9.73
10.09
Separation PA
—
—
30.2 5+
Year
—
1991
Spectra
G5
G5
Colors
W
W
Notes:
1897: 31.0 @ 4. 11 measurements.
Observations:
C8 at 104x. It is nested inside a larger 9m triangle.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 21.4 inches; B = 21.8 inches.
Separation: AB = 1.97 miles.
Distance (LY): 42
Total luminosity (Suns): 0.031
STF 2253
Rating: 4 E
ADS 10940; HD 163972; SAO 103259
Position: 1758+1437
A
B
C
Magnitude
8.41
10.91
11.53
Separation
—
7.9 -!!
72.4 -
PA
—
78 63 -
Year
—
1996
1991
Spectra
M0
Colors
Y
W
W
Notes:
AB 1829: 18.1 @ 80. 22 measurements.
AC 1877: 76.1 @ 65. 6 measurements.
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 41.6 inches.
Separation: AB = 112 miles; AC = 1,028 miles.
Distance (LY): 9,100
Total luminosity (Suns): 3,270
- 15 -
Zone 171
54 Oph
STF 2184; ADS 10633; HD 159466; SAO 102925
Position: 1734+1309
A
B
C
Magnitude
6.70
11.60
Separation
—
22.3 127.2
PA
—
70 293
Rating: 5 E
Year
—
1963
1920
Spectra
G5 III
Colors
Y
O
No
Notes:
AB 1830: 21.4 @ 77. 11 measurements.
AC 1 measurement.
Observations:
C8 at 83x. Webb saw them as Y and ?. Rich field.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 39.0 inches.
Separation: AB = 17.7 miles; AC = 101 miles.
Distance (LY): 510
Total luminosity (Suns): 40.46
Moderate
STF 2222
Rating: 3 M
ADS 10803; HD 161938
Position: 1748+1449
A
B
Magnitude
8.41
9.73
Separation PA
—
—
2.3 +
62 +
Year
—
1991
Spectra
K0
Colors
Y
O
Notes:
1830: 2.1 @ 59. 31 measurements.
Observations:
C8 at 280x. Nice field, but a difficult pair. It lies just north of 8m HD 161960.
- 16 -
Zone 171
h1303
V624 Her; ADS 10749; HD 161321; SAO 103069
Position: 1744+1425
A
B
Magnitude
6.21
12.04
Separation PA
—
—
39.7 +
151 +
Rating: 4 M
Year
—
1959
Spectra
A3m
Colors
W
Y?
Notes:
1904: 37.9 @ 150. 4 measurements.
A is an eclipsing binary.
Observations:
C11 at 193x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 6.51 inches.
Separation: AB = 29.2 miles.
Distance (LY): 471
Total luminosity (Suns): 57
Jonckheere 2115
Position: 1744+1455
A
B
Magnitude
10.09
10.60
Rating: 5 M
Separation PA
—
—
6.8 +
222 -
Year
—
1946
Notes:
1896: 6.3 @ 224. 5 measurements.
Observations:
C11 at 115x. This pair lies 5 min SE of a 9m star.
- 17 -
Spectra
Colors
W
?
Zone 171
Difficult
Barton 1287
Position: 1739+1153
A
B
C
Magnitude
10.32
10.91
12.30
Rating: 5 D
Separation
—
4.1 +
4.8 -!
PA
—
123 158 =
Year
—
1999
1983
Spectra
Colors
Y
O?
No
Notes:
AB 1909: 3.8 @ 124. 5 measurements.
AC 1909: 10.1 @ 158. 3 measurements.
Observations:
C11 at 115x.
Distance (LY): 119
Total luminosity (Suns): 0.14
Zone 171, Map 4
Double Stars
Easy
STF 2193
Rating: 5 D
ADS 10719
Position: 1742+0814
A
B
Magnitude
10.71
10.84
Separation PA
—
—
6.1 +
66 -
Notes:
1830: 5.7 @ 69. 19 measurements.
- 18 -
Year
—
1991
Spectra
F8
Colors
W
W
Zone 171
Observations:
C11 at 115x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 17.3 inches.
Separation: AB = 2,482 feet.
Distance (LY): 50
Total luminosity (Suns): 0.02
STF 2200
Rating: 2 E
ADS 10741
Position: 1744+0551
A
B
C
Magnitude
8.5
9.18
12.5
Separation
—
1.6 31.1
PA
—
163 246
Year
—
1999
1912
Spectra
A0
Colors
W
W
?
Notes:
1830: 1.7 @ 168. 32 measurements.
AC 1 measurement.
Observations:
C11 at 339x. It is the obtuse angle of a large triangle of 9m stars.
53 Oph
SI 34; Baillaid 2443 (B); ADS 10635; HD 159480; SAO 122526
Position: 1735+0935
A
B
C
D
Magnitude
5.81
7.62
11.99
10.80
Separation
—
41.4 96.6 +
127.2 +!!
PA
—
190 345 +
223 =
Year
—
1994
1989
1989
Rating: 2 E
Spectra
A2 V
A8 IV
Colors
W
B
?
?
Notes:
AB 1822: 41.6 @ 192. 51 measurements. The stars share a small common proper
motion.
AC 1896: 92.7 @ 344. 3 measurements.
BD 1912: 91.4 @ 223. 2 measurements.
- 19 -
Zone 171
Observations:
C8 at 65x. Webb saw them as W and B! Rich field.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 8.40 inches; B = 8.70 inches.
Separation: AB = 22.1 miles; AC = 51.6 miles.
Distance (LY): 342
Total luminosity (Suns): 48.876
STF 2185
Rating: 3 E
ADS 10638; HD 159481; SAO 122529
Position: 1735+0601
A
B
C
D
E
Magnitude
7.38
10.52
8.37
9.10
11.40
Separation
—
27.4 85.9 89.6
145.4
PA
—
3245 +!
203
180
Year
—
1986
1991
1912
1921
Spectra
F8
G
Colors
W
W
?
?
No
Notes:
AB 1830: 27.5 @ 6. 26 measurements. The stars share common proper motion. The
Hipparcos mission found an 8.87m companion to A in 0.3 @ 242.
AC 1864: 97.1 @ 190. 37 measurements.
AD 1 measurement.
AE 1909: 140.7 @ 182. 3 measurements.
Observations:
C8 at 83x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 14.4 inches; C = 19.8 inches.
Separation: AB = 10.3 miles; AC = 32.4 miles; AD = 33.8 miles; AE = 54.9
miles.
Distance (LY): 242
Total luminosity (Suns): 8.2
- 20 -
Zone 171
A. G. 212
Rating: 3 E
ADS 10730
Position: 1743+0520
A
B
Magnitude
10.15
10.16
Separation PA
—
—
2.6 +
25 -
Year
—
1998
Spectra
F0
Colors
W
W
Notes:
1904: 2.5 @ 26. 20 measurements.
Observations:
C11 at 115x!
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 11.8 inches.
Separation: AB = 2,165 feet.
Distance (LY): 103
Total luminosity (Suns): 0.14
STF 2228
Rating: 3 E
ADS B8179
Position: 1750+0911
A
B
Magnitude
10.40
10.50
Separation PA
—
—
19.4 +
288 +?
Year
—
1905
Spectra
K0
Colors
O
rO
Notes:
1829: 18.6 @ 107. 6 measurements. Hipparcos/Tycho data show different distances
for these stars; they may be optical. Quadrant reversal.
Observations:
C8 at 104x. Two bright stars (9.2m and 8.1m) to the WSW point to it.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 27.7 inches.
Separation: AB = 124 miles.
Distance (LY): 4,100
Total luminosity (Suns): 200
- 21 -
Zone 171
STF 2188
Rating: 4 E
ADS 10656; HD 159779; SAO 122553
Position: 1736+0637
A
B
Magnitude
9.22
9.98
Separation PA
—
—
5.6 +
203 -
Year
—
1991
Spectra
A5
Colors
yW
rO
Notes:
1831: 5.5 @ 204. 19 measurements. The stars have a small difference in proper
motion.
Observations:
C8 at 206x. Very faint.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 8.73 inches.
Separation: AB = 7.69 miles.
Distance (LY): 880
Total luminosity (Suns): 17
STF 2216 rej
Rating: 4 E
HD 161733; SAO 122742
Position: 1747+0541
A
B
Magnitude
8.00
10.23
Separation PA
—
—
27.3 27 =
Year
—
1982
Spectra
B8
Colors
W
bW
Notes:
1894: 27.4 @ 27. 9 measurements. The stars have a small difference in proper
motion.
Observations:
C8 at 104x. The wonderful field (IC 4665) overpowers it.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 4.27 inches.
Separation: AB = 3.74 miles.
Distance (LY): 88
Total luminosity (Suns): 0.43
- 22 -
Zone 171
STF 2230
Rating: 4 E
HD 162429; SAO 122822
Position: 1751+0755
A
B
C
Magnitude
9.10
9.70
11.50
Separation
—
46.4 +
38.3 +
PA
—
86 +
109 +
Year
—
1983
1919
Spectra
A2
A5
Colors
W
W
No
Notes:
AB 1831: 44.4 @ 83. 21 measurements. The stars have different proper motions.
AC 1831: 36.5 @ 107. 10 measurements.
Observations:
C8 at 104x. Faint.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 7.53 inches; B = 8.95 inches.
Separation: AB = 10.1 miles; AC = 8.36 miles.
Distance (LY): 140
Total luminosity (Suns): 0.5
STF 2227
Position: 1750+0520
A
B
Magnitude
10.00
10.00
Rating: 5 E
Separation PA
—
—
15.7 291 -
Year
—
1992
Spectra
K5
Colors
W
W
Notes:
1830: 19.7 @ 117. 17 measurements. Quadrant reversal.
Observations:
C8 at 104x. It is a very faint pair at the SW end of a short chain with two stars of 9m.
- 23 -
Zone 171
Moderate
STF 2212
Rating: 5 M
ADS 10779; HD 161621; SAO 122730
Position: 1746+0542
A
B
Magnitude
9.51
9.60
Separation PA
—
—
3.3 +
342 =
Year
—
1999
Spectra
A0
Colors
yW
?
Notes:
1832: 3.1 @ 342. 41 measurements.
Observations:
C8 at 206x. It lies inside the open cluster IC 4665, which badly overwhelms it.
Deep Sky Objects
Easy
IC 4665
Rating: 3 E
Other Names: Melotte 179; Collinder 349
Astronomical League Program: Urban Deep Sky Club, Binocular Deep Sky Club
Position: 1746+0543
Type: Oc
Dimensions: 55'
Class: III 2p
Cluster population: 30
Magnitude: 6.0
Notes:
This cluster is 36 million years old. The brightest star is 6.9m.
It is 22.4 light years in diameter.
Observations:
C8 at 37x. Although it looks best in the spotter, I was struck by a pattern that
resembled a sideways figure "8".
C11 at 98x. Large and scattered group; it is longer (NE-SW) than wide and a
meandering stream of bright stars dominates the mid-line.
- 24 -
Zone 171
Model (where the Sun is a baseball):
Its diameter would be 7,200 miles, with its stars 1,160 mi apart.
Distance (LY): 1,400
Luminosity (suns): 412
IC 4665
Open cluster (III 2 p; 30 stars)
Observed with C11 on 7/26/03
Magnification: 98x
Moderate
NGC 6509
Other Names: UGC 11075
Rating: 5 M
Position: 1759+0617
Type: Gal
Surface brightness: 13.0
Class: SBcd
Dimensions: 1.6' x 1.2'
Magnitude: 12.5
PA: 105
Observations:
C11 at 98x. Starlike nucleus with a very small fringe. It looks a little like a small
planetary.
Radial velocity (km/sec): +1,814
- 25 -
Zone 171
Difficult
NGC 6384
Other Names: UGC 10891
Rating: 5 D
Position: 1732+0704
Type: Gal
Surface brightness: 13.9
Class: SAB(r)bc I
Dimensions: 7' x 4.6'
Magnitude: 10.4
PA: 30
Observations:
C8 at 83x. Small bright nucleus, but I could not pick up a halo. Moderately rich
field.
C11 at 193x. Very faint patch, with no details on a night of low transparency (2 out
of 5). It lies 8 min W of a bright dogleg of stars.
Model (where the Sun is a baseball):
Its diameter would be 39 million miles.
Distance (LY): 60,000,000
Radial velocity (km/sec): +1,665
Luminosity (suns): 19,500,000,000
- 26 -
Zone 171
Zone 171 Mini-Catalog
Double Stars
Designation
Position
Rating
Map
STF 2200
1744+0551
E
4
STF 2166
1728+1123
2E
1
53 Oph
1735+0935
2E
4
Alpha Her
1715+1423
3E
1
STF 2176
1731+1027
3E
3
STF 2185
1735+0601
3E
4
A. G. 212
1743+0520
3E
4
A. G. 356
1746+1019
3E
3
STF 2217
1747+1447
3E
3
STF 2228
1750+0911
3E
4
STF 2115
1702+1457
4E
1
STF 2113
1702+0713
4E
2
STF 2143 rej
1715+1000
4E
1
STF 2159
1725+1320
4E
1
A. G. 355
1732+1040
4E
3
STF 2188
1736+0637
4E
4
STF 2216 rej
1747+0541
4E
4
STF 2230
1751+0755
4E
4
STF 2231 rej
1751+1213
4E
3
Component
A
B
C
A
B
A
B
C
D
A
B
C
A
B
C
A
B
C
D
E
A
B
A
B
A
B
C
A
B
A
B
A
B
C
D
A
B
A
B
A
B
A
B
A
B
A
B
C
A
B
- 27 -
Mag
8.50
9.18
12.50
7.11
8.62
5.81
7.62
11.99
10.80
2.78
5.12
11.10
9.40
10.20
9.53
7.38
10.52
8.37
9.10
11.40
10.15
10.16
9.50
10.45
8.06
8.18
12.70
10.40
10.50
6.29
10.21
8.25
10.25
13.60
12.80
9.06
11.03
8.49
9.29
9.36
10.57
9.22
9.98
8.00
10.23
9.10
9.70
11.50
8.90
10.90
Separation
—
1.6 31.1
—
27.5 =
—
41.4 96.6 +
127.2 +!!
—
4.8 +
81.0 —
16.5 89.9 —
27.4 85.9 89.6
145.4
—
2.6 +
—
13.0 +!
—
7.0 +
25.4
—
19.4 +
—
19.0 =
—
4.9 +
18.1
40.5
—
28.6 —
26.5 +
—
22.6 +
—
5.6 +
—
27.3 —
46.4 +
38.3 +
—
32.2 -
PA
—
163 31.1
—
282 —
190 96.6 +
127.2 +!!
—
105 81.0 —
14 +
89.9 —
385.9 89.6
180
—
25 —
213 +!
—
284 25.4
—
288 +?
—
237 —
117 18.1
40.5
—
119 —
325 —
333 —
203 —
27 =
—
86 +
38.3 +
—
153 +
Zone 171
Designation
Position
Rating
Map
h1306
1753+1401
4E
3
OSS 160
1753+1058
4E
3
STF 2253
1758+1437
4E
3
SI 33
1704+1336
5E
1
60 Her
1705+1244
5E
1
STF 2123
1707+0648
5E
2
54 Oph
1734+1309
5E
3
STF 2227
1750+0520
5E
4
STF 2170
1729+1029
3M
1
STF 2222
1748+1449
3M
3
h1303
1744+1425
4M
3
A. G. 353
1707+1213
5M
1
OS 326
Jonckheere
2115
1718+0931
5M
2
1744+1455
5M
3
STF 2212
1746+0542
5M
4
STF 2114
1702+0827
4D
2
Bur 357
1706+1033
4D
1
Barton 1287
1739+1153
5D
3
STF 2193
1742+0814
5D
4
Component
A
B
A
B
A
B
C
A
B
b
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
C
A
B
Mag
9.73
10.09
8.39
9.63
8.41
10.91
11.53
5.90
6.10
10.00
4.88
10.35
9.84
9.88
6.70
11.60
10.00
10.00
9.38
10.01
8.41
9.73
6.21
12.04
9.86
11.20
8.06
12.48
10.09
10.60
9.51
9.60
6.75
7.67
8.26
9.72
10.32
10.91
12.30
10.71
10.84
Separation
—
30.2 —
101.6 —
7.9 -!!
72.4 —
299 =
151.9 —
58.7 +!
—
18.3 —
22.3 127.2
—
15.7 —
3.5 —
2.3 +
—
39.7 +
—
9.5 +
—
16.9 +
—
6.8 +
—
3.3 +
—
1.3 —
1.4 +
—
4.1 +
4.8 -!
—
6.1 +
PA
—
5+
—
190 —
78 72.4 —
116 =
268 =
—
309 +
—
216 —
70 127.2
—
291 —
60 —
62 +
—
151 +
—
248 —
218 +
—
222 —
342 =
—
186 +
—
308 +
—
123 4.8 -!
—
66 -
Deep Space
Object
IC 4665
NGC 6509
NGC 6384
Position
1746+0543
1759+0617
1732+0704
Rating
3E
5M
5D
Map
4
4
4
Type
Oc (III 2p)
Gal (SBcd)
Gal (SAB(r)bc I)
- 28 -
Specifications
Surface
Mag
Br
6.0
12.5
13.0
10.4
13.9
Population
30