Zone 242, Master Map
Normal View
-16°00'
-14°00'
Zone Master, Normal View, 10 deg FOV
φ
-18°00'
c
Octans
χ
ν
β2
Acrab
β1 Graffias,
Libra
ψ
ω1
ω2
-20°00'
e
f
-22°00'
ω
d
δ
-24°00'
ρ
ο
Scorpius
17h 04m
16h 56m
16h 48m
σ
16h 40m
16h 32m
16h 24m
16h 16m
16h 08m
16h 00m
Zone 242, Map 1
Normal Image
-16°00'
-15°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
-17°00'
49 Lib
-18°00'
Rossiter 2992
Octans
-19°00'
χ
ν
ψ
16h 30m
16h 25m
Sh 225
Nu Sco
IC 4592
β1
β2
Graffias, Acrab
Beta Sco
H V 124
16h 20m
16h 15m
16h 10m
16h 05m
16h 00m
Zone 242, Map 1
Mirror Image
-16°00'
-15°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
-17°00'
49 Lib
-18°00'
Rossiter 2992
Octans
-19°00'
χ
Nu Sco
IC 4592ν
Sh 213
16h 00m
β1 Graffias, Acrab
β2 Beta Sco
16h 05m
16h 10m
Sh 225
16h 15m
16h 20m
ψ
16h 25m
16h 30m
Zone 242, Map 2
Normal Image
ψ
H V 124
β2
Sh 225
Beta Sco
Libra
-20°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
Holden 127
ω1
-22°00'
-21°00'
ω2
LDS 548
-23°00'
δ
NGC 6093
Bur 624
Rho Oph
-24°00'
ρ
ο
Octans
Bur 38
22 Sco
16h 30m
16h 25m
16h 20m
16h 15m
16h 10m
16h 05m
16h 00m
Zone 242, Map 2
Mirror Image
Sh 213
β2Beta Sco
ψ
Sh 225
Libra
-20°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
H V 124
Holden 127
ω1
-22°00'
-21°00'
ω2
LDS 548
-23°00'
δ
NGC 6093
Bur 624
Rho Oph
-24°00'
ρ
ο
Octans
Bur 38
16h 00m
16h 05m
16h 10m
16h 15m
16h 20m
16h 25m
IC 4605
16h 30m
Zone 242, Map 3
Normal Image
Jonckheere 1591
-16°00'
-15°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
-17°00'
φ
Skinner 10
-18°00'
h4879
-19°00'
Aravamudan 434
Sh 240
17h 00m
16h 55m
h4888
16h 50m
16h 45m
16h 40m
16h 35m
16h 30m
Zone 242, Map 3
Mirror Image
-16°00'
-15°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
Jonckheere 1591
-17°00'
φ Phi Oph
Skinner 10
-18°00'
h4879
-19°00'
Aravamudan 434
Sh 240
h4888
16h 30m
16h 35m
16h 40m
16h 45m
16h 50m
16h 55m
17h 00m
Zone 242, Map 4
Normal Image
-21°00'
-20°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
Aravamudan 1120
-22°00'
ω
Bur 123
NGC 6235
-23°00'
Aravamudan 1812
-24°00'
24 Oph
h4907
h1294
h4891
Scorpius
17h 00m
16h 55m
16h 50m
IC 4605
16h 45m
16h 40m
16h 35m
16h 30m
Zone 242, Map 4
Mirror Image
Aravamudan 1120
-21°00'
-20°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
-22°00'
ω
Bur 123
NGC 6235
-24°00'
24 Oph
-23°00'
Aravamudan 1812
h1294
h4891
22 Sco
16h 30m
Scorpius
16h 35m
16h 40m
16h 45m
16h 50m
16h 55m
17h 00m
Zone 242
23 Double Stars, 1 Bright Nebula, 2 Globular Clusters
Flamsteed
J
24 Oph ................................................. 18
49 Lib..................................................... 3
Jonckheere 1591 .................................. 13
A
LDS 548................................................. 7
Aravamudan 1120................................ 17
Aravamudan 1812................................ 16
Aravamudan 434.................................. 14
N
L
NGC 6093 .............................................. 9
NGC 6235 ............................................ 19
Nu Sco.................................................... 4
B
Beta Sco................................................. 2
Bur 123 ................................................ 17
Bur 624 .................................................. 9
P
H
R
H V 124 ................................................. 6
h1294 ................................................... 18
h4879 ................................................... 13
h4888 ................................................... 12
h4891 ................................................... 16
Holden 127 ............................................ 8
Rho Oph................................................. 7
Rossiter 2992 ......................................... 4
Phi Oph ................................................ 15
S
Sh 225 .................................................... 6
Sh 240 .................................................. 14
Skinner 10 ............................................ 12
I
IC 4592 .................................................. 5
-1-
Zone 242
Zone 242, Map 1
Double Stars
Easy
Beta Sco
Rating: 2 E
8 Sco; Graffias, "the crab", H 494; ADS 9913; HD 144217; SAO 159682; H III 7
Astronomical League Program: Double Star Club
Position: 1605-1948
A
B
Magnitude
2.56
4.90
Separation PA
—
—
13.6 +
20 -
Year
—
1991
Spectra
B0 V
Colors
W
Y
Notes:
The name is derived from the ancient belief that scorpions developed into crabs as
they matured.
1823: 13.1 @ 24. 91 measurements.
Star A is a spectroscopic binary with a period of 6.8281 days. It is also an infra-red
source and is 0.000422" in diameter as determined from occulations by Jupiter. Such
occultations also yield 0.001" separation for A-a and 0.129" for A-a'. The two stars
weigh in at 21 and 13 solar masses, and they lie an average of 8 million miles apart.
Beta Sco was occulted by Jupiter on May 13, 1971. Since Jupiter has an extensive
atmosphere, disappearance and reappearance were not instantaneous like occultations by
our Moon— in fact, when A reappeared, it took a full 7 minutes to reach full brightness
again, as its light was obviously "climbing up" through the Jovian atmosphere.
Burnham found a companio to A, 10m, 0.9 @ 94.
The stars share similar proper motion.
From James Kaler's Star Notes:
It is wonderfully complex. Through a small telescope we see a classic double star, the
components 14 seconds of arc apart, similar to the separation of those that make Mizar in
the Big Dipper. The two are at least 2,200 astronomical units apart and take over 16,000
years to orbit each other. Both are hot class B stars, Beta-1 the hotter with a temperature
of around 27,000 Kelvin, Beta-2 closer to 22,000. Though both should appear blue-white
to the eye, the brightness difference makes them look different through the telescope, the
fainter one seeming a bit ashen, rather yellowish.
The fun begins with closer examination. Beta-1 has a sixth magnitude closer
companion only half a second of arc (projected 80 astronomical units) away, so Graffias
-2-
Zone 242
now seems triple. More, Beta-1 proper (the brighter) is a "spectroscopic binary," the
spectrum showing two stars in orbit with a period of 6.8 days, the separation a mere
0.001 seconds, 0.3 AU, closer than Mercury is from the Sun. Still more, Beta-2 has a
fainter companion a tenth of a second away from it. Graffias is at least a quintuple star,
and there are suggestions of more pieces. All five except perhaps for the faint companion
of Beta-2 are hot B stars, vividly showing their propensity for multiple birth. The
brightest, the chief star of the Beta-1 triple, is around 15,000 times the solar luminosity.
What a sight it would be from an "earth" orbiting Beta-1 and its two companions, say
at 150 astronomical units where we could survive. We would have a triple Sun, and off in
the distance the double Beta-2 would shine 50 times brighter than our full Moon. Both of
the Beta-1 close pair are over 10 times as massive as the Sun, and both will probably
explode sometime in the next few million years. Scorpius and its neighboring
constellations are filled with stars like these. Some of what we know of the system came
from a rare occultation by Jupiter in 1971, Beta-2 by Jupiter's satellite Io.
Observations:
C8 at 83x. Some observers report B and W. Webb saw yW and G?.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 14.4 inches.
Separation: AB = 11.2 miles; Aa = 1.89 feet.
Distance (LY): 530
Total luminosity (Suns): 2,310
49 Lib
Engelmann 55; HD 143333; SAO 159625
Rating: 5 E
Position: 1600-1631
A
B
Magnitude
5.47
12.12
Separation PA
—
—
151.3 311 +
Year
—
1924
Spectra
F8 V
Colors
W
?
Notes:
1886: 162.7 @ 301. 3 measurements. Star A is a long-period spectroscopic binary.
Observations:
C8 at 104x.
C11 at 98x.
-3-
Zone 242
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 3.60 inches.
Separation: AB = 25.3 miles.
Distance (LY): 107
Total luminosity (Suns): 5.73
Moderate
Rossiter 2992
Rating: 4 M
Position: 1601-1739
A
B
Magnitude
10.11
10.29
Separation PA
—
—
2.4 +
87 +
Year
—
1997
Spectra
F3/5 V
Colors
W
W
Notes:
1935: 2.3 @ 79. 6 measurements.
Observations:
C11 at 339x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 8.10 inches.
Separation: AB = 1.71 miles.
Distance (LY): 458
Total luminosity (Suns): 2.74
Difficult
Nu Sco
Rating: 2 D
14 Sco; Jabbah; Lesath; H 497; Bur 120; ADS 9951; HD 145502; SAO 159764; H V 6
Astronomical League Program: Double Star Club
Position: 1612-1927
A
B
C
Aa
Magnitude
4.00
7.80
6.55
Separation
—
1.3 +
41.2 =
0.1 =
PA
—
2+
336 165
-4-
Year
—
1996
1985
1989
Spectra
B2 IV
A0p
Colors
Y
Y
?
No
Zone 242
Notes:
AB 1876: 0.7 @ 0. 76 measurements. Star A is a spectroscopic binary with a 5.922
day period and rotates at 199 km/sec. It shows two distinct spectra, so it may in fact be
quadruple. The stars share common proper motion.
AC 1821: 41.2 @ 337. 45 measurements.
Aa 1988: 0.1 @ 172. 2 measurements.
This pair is a member of the Sco OB2 Association.
Observations:
C8 at 83x. A double double! Some report Y and O, both Y, W and B, or pB and dB.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 16.2 inches; B = 6.05 inches.
Separation: AB = 4,646 feet; AC = 28.1 miles; Aa = 1.72 feet.
Distance (LY): 437
Total luminosity (Suns): 471
Deep Sky Objects
Easy
IC 4592
Position: 1612-1928
Type: Gn
Rating: 5 E
Class: R
Dimensions: 160' x 45'
Notes:
The true size is large— 1.5o by 3o.
Observations:
C8 at 83x. It surrounds Nu Sco. It drops off quickly in brightness. There seems to be
a dark lane to the SE.
-5-
Zone 242
Zone 242, Map 2
Double Stars
Easy
H V 124
Rating: 2 E
Schjellerup 226 (C); Bos 1808; ADS 10005; HD 147103; SAO 159865
Position: 1620-2007
A
B
Magnitude
7.55
8.41
Separation PA
—
—
12.6 20 -
Year
—
1991
Spectra
B9 V
Colors
Y
B
Notes:
1826: 13.1 @ 21. 25 measurements. The stars share common proper motion.
Observations:
C8 at 83x.
Distance (LY): 122
Total luminosity (Suns): 1.6
Sh 225
V933 Sco; HD 147010; SAO 159860; H V 134
Rating: 3 E
Position: 1620-2003
A
B
Magnitude
7.36
8.05
Separation PA
—
—
46.7 333 =
Year
—
1991
Spectra
B9 II
A0 V
Colors
W
W
Notes:
1823: 46.8 @ 333. 21 measurements. The stars share common proper motion.
Observations:
C8 at 83x.
-6-
Zone 242
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 10.2 inches; B = 9.00 inches.
Separation: AB = 34.0 miles.
Distance (LY): 467
Total luminosity (Suns): 29
Rho Oph
5 Oph; Bur 1115; ADS 10049; HD 147933; SAO 184381; H II 19
Rating: 3 E
Position: 1626-2327
A
B
C
D
E
DE
Magnitude
4.57
5.22
7.27
6.75
8.67
Separation
—
2.9 151.1 156.3 -
PA
—
340 0-
Year
—
1996
1991
253 -
0.4 -
318 -!
1991
Spectra
B2 V
B
1991
Colors
Y
Y
W
No
Notes:
AB 1822: 4.1 @ 3. 86 measurements. Hipparcos/Tycho data show different
distances for these stars (394, 420 and 444 light years); they may be optical.
AB 1846: 152.0 @ 1. 4 measurements.
AD 1846: 161.0 @ 254. 7 measurements.
All these stars share a small common proper motion.
This star is part of the Sco OB2 Association and rotates very rapidly.
Observations:
C8 at 206x. Webb saw them as yW and Y.
LDS 548
Rating: 4 E
HD 143937; SAO 184077
Position: 1604-2156
A
B
Magnitude
8.64
11.00
Separation PA
—
—
10.3 +
155 -
-7-
Year
—
1991
Spectra
K0 V
Colors
Y
W
Zone 242
Notes:
1920: 9.9 @ 159. 7 measurements.
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 2.40 inches.
Separation: AB = 2.20 miles.
Distance (LY): 137
Total luminosity (Suns): 0.6
Holden 127
Rating: 4 E
ADS 9914; HD 144219
Position: 1605-2030
A
B
C
Magnitude
9.77
11.80
10.79
Separation
—
2.3 +
68.2 +
PA
—
117 303 -
Year
—
1971
1991
Notes:
AB 1889: 2.0 @ 131. 8 measurements.
AC 1909: 65.0 @ 304. 8 measurements.
Observations:
C11 at 98x. B was picked up at 339x.
The field here is quite nice— almost like an open cluster.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 49.5 inches.
Separation: AB = 3.01 miles; AC = 89.4 miles.
Distance (LY): 840
Total luminosity (Suns): 10.3
-8-
Spectra
K1/2 III:
Colors
Y
W
W
Zone 242
Difficult
Bur 624
Rating: 5 D
ADS 10024; HD 147432; SAO 184350
Position: 1623-2308
A
B
Magnitude
6.45
9.41
Separation PA
—
—
1.1 =
318 -
Year
—
1991
Spectra
A1 V
Colors
Y
?
Notes:
AB 1878: 1.1 @ 322. 21 measurement.
Observations:
C8 at 280x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 8.70 inches.
Separation: AB = 3907 feet.
Distance (LY): 434
Total luminosity (Suns): 15
Deep Sky Objects
Easy
NGC 6093
Rating: 3 E
Other Names: M80
Astronomical Leage Program: Messier Club,Messier Binocular Club
Position: 1617-2259
Type: Gc
Dimensions: 7'
Class: 2
Magnitude: 8.4
Cluster population: 100,000
-9-
Zone 242
Notes:
It was first discovered by Messier on January 4, 1781 and is 50 light years in
diameter. William Herschel resolved it in 1785.
The brightest stars are 13.4m and the horizontal branch is 15.8m.
Absorption is 0.9m.
M80 is a fine 8th mag globular. Its 10' angular diameter corresponds to roughly 95
light years linear dimension at its distance of 27,400 light years. Its appearance resembles
very much that of a comet.
This dense stellar swarm contains several 100,000 of stars, held together by their
mutual gravitational attraction. It is one of the densest globulars in our Milky Way
Galaxy. As was found by astronomers from observations with the Hubble Space
Telescope in 1999 in the visible and UV part of the electromagnetic spectrum, M80
contains a large number of so-called "Blue Stragglers" in its core, about twice as much as
any other globular investigated with the HST. These stars are blue and bright stars which
appear near the main-sequence of the Hertzsprung-Russell diagramm, and thus appear
more massive and younger than the globular clusters age. The reason is very probably
that these stars lost their cooler envelopes in close encounters with other stars. Their large
number in M80 indicates an exceptionally high stellar collision rate in the core of this
globular cluster.
Globular cluster M80 was one of the original discoveries of Charles Messier, who
found it on January 4, 1780, and cataloged it as a "Nebula without a star, .. resembling
the nucleus of a comet." William Herschel was the first to resolve it (before 1785), and
found it was "one of the richest and most compressed clusters of small stars I remember
to have seen."
On May 21, 1860, a nove occurred in M80, completely changing the appearance of
this globular cluster for some days. This nova, also designated T Scorpii was discovered
by Auwers at Berlin, had mag 7.0 on May 21 and 22, and faded to mag 10.5 on June 16.
It was independently seen by Pogson. It was reported that Pogson had seen a
rebrightening in early 1864, but this appears improbable, as nobody else could confirm
this notion. The maximum brighteness of this nova corresponds to an absolute magnitude
of about -8.5, if it was a cluster member. At its maximum, the nova was considerably
brighter than the whole cluster !
A second nova occured in globular cluster M14 in 1938 but was only
photographically observed, and found years later. A further nova was V 1148 Sagittarii
which appeared near NGC 6553, but in this case a physical correlation is uncertain. Other
cataclysmic variable observations in globulars are occasionally reported: Early
observations of dwarf novae were recorded for M5, M30 and NGC 6712, according to
Cecilia Payne-Gaposhkin's book, Stars and Clusters.
In M80, however, investigations with the Hubble Space Telescope have lead to the
detection of only two nova-like close binary stars, far fewer than expected theoretically,
based on the stellar collision rate.
[Source: http://www.seds.org/messier/m/m080.html]
- 10 -
Zone 242
Observations:
C8 at 104x. Bright and unresolved; extremely dense. Use high power. A 9m star lies
on the NE edge. There is a very faint triple to the W.
C11 at 98x. Estimated calss of 2. Very small and compact; grainy, but not wellresolved. It is flanked by two 10m stars.
14x70 Binos. I needed averted vision to get it through the haze and sky glow of
Kansas City.
Model (where the Sun is a baseball):
Its diameter would be 21,370 miles with stars 229 miles apart.
Distance (LY): 32,600
Luminosity (suns): 36,000
NGC 6093 (M80)
Globular cluster
Observed with C8 on 7/26/03
Magnification: 80x
ASKC Star Party, Louisburg Lake
- 11 -
Zone 242
Zone 242, Map 3
Double Stars
Easy
Skinner 10
Rating: 2 E
ADS 10197; HD 151148
Position: 1646-1721
A
B
Magnitude
8.93
9.13
Separation PA
—
—
3.4 =
85 -
Year
—
1994
Spectra
F8 V
Colors
W
Y
Notes:
1895: 3.4 @ 86. 21 measurements.
Observations:
C11 at 98x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 3.60 inches.
Separation: AB = 1.76 miles.
Distance (LY): 332
Total luminosity (Suns): 4.35
h4888
Rating: 2 E
ADS 10219; HD 151576; SAO 160110
Position: 1649-1936
A
B
Magnitude
9.56
9.57
Separation PA
—
—
11.9 +
230 -!
Notes:
1836: 8.0 @ 311. 22 measurements.
- 12 -
Year
—
1991
Spectra
A4 V
Colors
W
W
Zone 242
Observations:
C11 at 98x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 7.80 inches.
Separation: AB = 5.88 miles.
Distance (LY): 317
Total luminosity (Suns): 2.27
Jonckheere 1591
Rating: 4 E
Position: 1630-1609
A
B
Magnitude
9.96
11.16
Separation PA
—
—
8.6 1+
Year
—
1991
Spectra
F0
Colors
W
W?
Notes:
1905: 9.2 @ 0. 6 measurements.
Observations:
C11 at 98x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 11.6 inches.
Separation: AB = 5.62 miles.
Distance (LY): 419
Total luminosity (Suns): 1.83
h4879
Rating: 4 E
ADS B7697
Position: 1639-1744
A
B
C
Magnitude
10.59
11.10
10.27
Separation
—
19.7 +
35.0 -
PA
—
341 =
258 +?
- 13 -
Year
—
1988
1988
Spectra
A8 IV
Colors
W
W
W
Zone 242
Notes:
AB 1898: 19.6 @ 341. 8 measurements.
AC 1898: 37.1 @ 74. 6 measurements. Quadrant reversal?
May be optical because Hipparcos gives different distances (257 light years to A, 36
to B).
Observations:
C8 at 104x. It makes a nice tiny triangle.
Aravamudan 434
Rating: 4 E
HD 152998; SAO 160188
Position: 1658-1811
A
B
Magnitude
9.69
12.60
Separation PA
—
—
11.7
153
Year
—
1916
Spectra
A5 II/III
Colors
W
W
Notes:
1 measurement.
Observations:
C11 at 98x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 7.80 inches.
Separation: AB = 4,224 feet.
Distance (LY): 44
Total luminosity (Suns): 0.022
Moderate
Sh 240
Piazzi 236; ADS 10266; HD 152909; SAO 160179
Rating: 2 M
Position: 1657-1932
A
B
Magnitude
6.27
7.38
Separation PA
—
—
4.7 233 +
- 14 -
Year
—
1991
Spectra
B7 III
B7 V
Colors
D
G
Zone 242
Notes:
1823: 5.0 @ 231. 37 measurements. The stars show similar proper motions.
Observations:
C8 at 206x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 10.8 inches; B = 10.8 inches.
Separation: AB = 4.98 miles.
Distance (LY): 680
Total luminosity (Suns): 127
Difficult
Phi Oph
8 Oph; Bur 626; ADS 10086; HD 148786; SAO 159963
Rating: 5 D
Position: 1631-1637
A
B
C
Magnitude
4.29
12.90
11.17
Separation
—
34.4 +
119.5 -
PA
—
37 +
319 +
Year
—
1916
1979
Spectra
K0 III
Notes:
AB 1878: 32.5 @ 36. 8 measurements.
AC 1904: 120.0 @ 317. 4 measurements.
The primary is an infra-red source.
Stars B and C together are only 0.16 times the brightness of the Sun.
This triple is part of the Hyades Group.
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 46.2 inches.
Separation: AB = 11.3 miles; AC = 39.2 miles.
Distance (LY): 210
Total luminosity (Suns): 67.12
- 15 -
Colors
Y!
?
?
Zone 242
Zone 242, Map 4
Double Stars
Easy
h4891
Rating: 4 E
SAO 184738
Position: 1652-2442
A
B
Magnitude
10.52
10.52
Separation PA
—
—
11.0 +
315 +?
Year
—
1991
Spectra
G
Colors
W
W
Notes:
1834: 5.0 @ 129. 12 measurements. Quadrant reversal?
Observations:
C11 at 98x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 22.2 inches.
Separation: AB = 4.41 miles.
Distance (LY): 257
Total luminosity (Suns): 0.652
Aravamudan 1812
Rating: 5 E
HD 151594; SAO 184671
Position: 1649-2242
A
B
Magnitude
8.89
10.19
Separation PA
—
—
14.4 +
286 +
Notes:
1921: 13.9 @ 285. 5 measurements.
- 16 -
Year
—
1991
Spectra
F2 V
Colors
Y
?
Zone 242
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 5.10 inches.
Separation: AB = 12.1 miles.
Distance (LY): 540
Total luminosity (Suns): 11
Aravamudan 1120
Rating: 5 E
Position: 1655-2100
A
B
Magnitude
10.75
11.40
Separation PA
—
—
6.0
0
Year
—
1919
Spectra
Colors
W
W
Notes:
1 measurement.
Observations:
C11 at 98x. This pair is the right angle in a small right triangle
Difficult
Bur 123
Rating: 4 D
ADS 10251; HD 152517
Position: 1655-2203
A
B
Magnitude
9.18
9.28
Separation PA
—
—
1.5 =
199 -
Year
—
1991
Notes:
1877: 1.5 @ 205. 23 measurements.
Observations:
C11 at 634x. This is one vertex of a small but bright triangle.
- 17 -
Spectra
A5 V
Colors
W
W
Zone 242
24 Oph
Bur 1117; ADS 10265; HD 152849
Rating: 4 D
Position: 1657-2309
A
B
Magnitude
5.57
5.92
Separation PA
—
—
1.0 +
301 +
Year
—
1994
Spectra
A0 V
Colors
W
W
Notes:
1889 (S. Burnham): 0.6 @ 264.
The stars share a small common proper motion.
Observations:
C8 at 697x, under steady but hazy skies.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 9.00 inches.
Separation: AB = 2,957 feet.
Distance (LY): 363
Total luminosity (Suns): 105
h1294
Rating: 5 D
HD 151415; SAO 184652
Position: 1648-2431
A
B
Magnitude
7.08
11.92
Separation PA
—
—
25.2 +
131 -
Year
—
1935
Notes:
1828: 18.0 @ 135. 5 measurements.
Observations:
C8 at 83x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 54.3 inches.
Separation: AB = 45.22 miles.
- 18 -
Spectra
K5 III
Colors
yO
?
Zone 242
Distance (LY): 1,150
Total luminosity (Suns): 202
Deep Sky Objects
Moderate
NGC 6235
Other Names: H II 584
Astronomical League Program: Herschel 400 Club
Rating: 4 M
Position: 1653-2211
Type: Gc
Dimensions: 2'
Class: 10
Magnitude: 10.4
Notes:
William Herschel found it in 1986.
Some astronomers think this may really be a large and dense open cluster.
The brightest stars are 14.0m and the horizontal branch is 16.7m.
Interstellar absorption here runs about 1.1m.
Observations:
C8 at 83x. Faint and grainy. It takes high power well, though, and is bracketed by
two faint stars.
C11 at 98x. Small, grainy object in a very richfield. It is centered in a faint triangle
of 11m stars. It appears to be brighter on the W side.
Model (where the Sun is a baseball):
Its diameter would be 6,180 miles.
Distance (LY): 33,000
Luminosity (suns): 5,900
- 19 -
Zone 242
Zone 242 Mini-Catalog
Double Stars
Designation
Position
Rating
Map
Beta Sco
1605-1948
2E
1
H V 124
1620-2007
2E
2
Skinner 10
1646-1721
2E
3
h4888
1649-1936
2E
3
Sh 225
1620-2003
3E
2
Rho Oph
1626-2327
3E
2
LDS 548
1604-2156
4E
2
Holden 127
Jonckheere
1591
1605-2030
4E
2
1630-1609
4E
3
h4879
1639-1744
4E
3
h4891
Aravamudan
434
1652-2442
4E
4
1658-1811
4E
3
1600-1631
5E
1
49 Lib
Aravamudan
1812
Aravamudan
1120
1649-2242
5E
4
1655-2100
5E
4
Sh 240
1657-1932
2M
3
Rossiter 2992
1601-1739
4M
1
Nu Sco
1612-1927
2D
1
Bur 123
1655-2203
4D
4
Component
A
B
A
B
A
B
A
B
A
B
A
B
C
D
E
DE
A
B
A
B
C
A
B
A
B
C
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
C
Aa
A
B
- 20 -
Mag
2.56
4.90
7.55
8.41
8.93
9.13
9.56
9.57
7.36
8.05
4.57
5.22
7.27
6.75
8.67
8.64
11.00
9.77
11.80
10.79
9.96
11.16
10.59
11.10
10.27
10.52
10.52
9.69
12.60
5.47
12.12
8.89
10.19
10.75
11.40
6.27
7.38
10.11
10.29
4.00
7.80
6.55
9.18
9.28
Separation
—
13.6 +
—
12.6 —
3.4 =
—
11.9 +
—
46.7 —
2.9 151.1 156.3 -
PA
—
20 —
20 —
85 —
230 -!
—
333 =
—
340 151.1 156.3 -
0.4 —
10.3 +
—
2.3 +
68.2 +
—
8.6 —
19.7 +
35.0 —
11.0 +
—
11.7
—
151.3 —
14.4 +
—
6.0
—
4.7 —
2.4 +
—
1.3 +
41.2 =
0.1 =
—
1.5 =
318 -!
—
155 —
117 68.2 +
—
1+
—
341 =
35.0 —
315 +?
—
153
—
311 +
—
286 +
—
0
—
233 +
—
87 +
—
2+
41.2 =
165
—
199 -
Zone 242
Designation
Position
Rating
Map
24 Oph
1657-2309
4D
4
Bur 624
1623-2308
5D
2
Phi Oph
1631-1637
5D
3
h1294
1648-2431
5D
4
Component
A
B
A
B
A
B
C
A
B
Mag
5.57
5.92
6.45
9.41
4.29
12.90
11.17
7.08
11.92
Separation
—
1.0 +
—
1.1 =
—
34.4 +
119.5 —
25.2 +
PA
—
301 +
—
318 —
37 +
119.5 —
131 -
Deep Space Objects
Object
NGC 6093
IC 4592
NGC 6235
Position
1617-2259
1612-1928
1653-2211
Rating
3E
5E
4M
Map
2
1
4
Type
Gc (2)
Gn (R)
Gc (10)
- 21 -
Specifications
Surface
Mag
Br
8.4
—
10.4
Population
100,000