Zone 137, Master Map
Normal View
Zone Master, Normal View, 10 deg FOV
κ
ω
δ
Gemini
+22°00'
c
Wasat
Clown Face Nebula
Eskimo Nebula
ζ
Mekbuda
+20°00'
e
+24°00'
ω1
ω2
f
+18°00'
Cancer
d
08h 00m
07h 52m
07h 44m
07h 36m
07h 28m
07h 20m
+16°00'
λ
07h 12m
07h 04m
06h 56m
Zone 137, Map 1
Normal Image
+25°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
A. G. 335
Bpm 98
STF 1023
OS 164 rej
52 Gem
Engelmann 30
STF 1053
h409
Jonckheere 701
NGC 2370
ω
+24°00'
OSS 85
Pourteau 2595
h408
+23°00'
NGC 2357
Pourteau 2816
h416
Barton 2374
A. G. 140
STF 1035
Hough 345
NGC 2365 Delta Gemδ
+22°00'
South 548
Ball 20
Wasat
Hussey 454
63 Gem
STF 1081
Soulie 395
+21°00'
OS 168 rej
Clown Face Nebula
Eskimo Nebula
STF 1083
56 Gem
07h 30m
07h 25m
NGC 2341
07h 20m
ζ
Mekbuda
Zeta Gem
h2372
07h 15m
07h 10m
07h 05m
07h 00m
Zone 137, Map 1
Mirror Image
+25°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
Bpm 98
52 Gem
STF 1023
OS 164 rej
Engelmann 30
OSS 85
STF 1053
h409
+24°00'
Jonckheere 701
ω
NGC 2370
Pourteau 2595
h408
+23°00'
NGC 2357
STF 1035
Ball 20
δ
Hough 345
NGC 2365
Wasat
Barton 2374
South 548
A. G. 140
Delta Gem
+22°00'
h416
Hussey 454
STF 1081
Soulie 395
63 Gem
Eskimo Nebula
NGC 2392
Zeta Gemζ
Mekbuda
NGC 2341
h2372
07h 00m
07h 05m
07h 10m
07h 15m
07h 20m
STF 1083
56 Gem
07h 25m
07h 30m
+21°00'
OS 168 rej
Zone 137, Map 2
Normal Image
+19°00'
+20°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
Jonckheere 728
NGC 2339
A. G. 331
STF 1090
+18°00'
Jonckheere 706
Hough 346
+17°00'
STF 1041 rej
STF 1027STF 1017
Lambda Gem
+16°00'
λ
51 Gem
STF 1106
45 Gem
Jonckheere 998
Jonckheere 2035
Engelmann 28
STF 1047
OS 162
Smart 72
STF 1094
Weisse 14
STF 1089
07h 30m
07h 25m
07h 20m
07h 15m
07h 10m
07h 05m
07h 00m
Zone 137, Map 2
Mirror Image
+19°00'
+20°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
Jonckheere 728
NGC 2339
Bur 899
A. G. 331
+18°00'
STF 1090
Hough 346
STF 1017
+17°00'
STF 1041 rej
STF 1027
51 Gem
OS 162
OS 162
45 Gem
Jonckheere 998
Jonckheere 2035
Engelmann 28
STF 1106
STF 1047
Smart 72
STF 1094
Weisse 14
STF 1089
07h 00m
07h 05m
07h 10m
07h 15m
07h 20m
07h 25m
07h 30m
+16°00'
Lambda Gemλ
Zone 137, Map 3
Normal Image
A. G. 335
NGC 2498
Pourteau 2835
+25°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
STF 1156
STF 1147
κ
Kappa Gem
+24°00'
STF 1113 rej
+23°00'
NGC 2481
STF 1171
A. G. 142
STF 1108
STF 1158
STF 1124
Hussey 707
h428
h432
Couteau 928
NGC 2420
+21°00'
Hough 523
Gemini
+22°00'
A. G. 144
h2418
Couteau 475
08h 00m
07h 55m
07h 50m
07h 45m
07h 40m
07h 35m
07h 30m
Zone 137, Map 3
Mirror Image
A. G. 335
ω2
+25°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
Pourteau 2835
OSS 85
STF 1156
STF 1147
Kappa Gem κ
+24°00'
STF 1113 rej
+23°00'
NGC 2481
A. G. 142
Pourteau 2816
STF 1108
STF 1158
STF 1124
NGC 2420
Hough 523
+21°00'
Hussey 707
63 Gem
+22°00'
A. G. 144
South 548
Clown Face Nebula
h428
h432
h2418
Couteau 928
Gemin
Couteau 475
07h 30m
07h 35m
07h 40m
07h 45m
07h 50m
07h 55m
08h 00m
Zone 137, Map 4
Normal Image
Gemini
Couteau 928
+20°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
h2418
Couteau 475
h2423
+19°00'
Cancer
Engelmann 33
NGC 2407
+18°00'
STF 1140
STF 1129
Soulie 422
+17°00'
h3299
+16°00'
STF 1167
OS 183 rej
Weisse 17
08h 00m
07h 55m
07h 50m
07h 45m
07h 40m
07h 35m
07h 30m
Zone 137, Map 4
Mirror Image
h2418
Couteau 928
+20°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
Gemin
Couteau 475
Cancer
+19°00'
Engelmann 33
NGC 2407
+18°00'
STF 1140
Jonckheere 706
STF 1129
Soulie 422
+16°00'
+17°00'
h3299
OS 183 rej
Weisse 17
07h 30m
07h 35m
07h 40m
07h 45m
07h 50m
07h 55m
08h 00m
Zone 137
Index
1 Reference Star, 63 Double Stars, 1 Planetary Nebula,
1 Open Cluster, 7 Galaxies
Flamsteed
h416 ..................................................... 14
h428 ..................................................... 34
h432 ..................................................... 31
Hough 345.............................................. 8
Hough 346............................................ 27
Hough 523............................................ 36
Hussey 454........................................... 10
Hussey 707........................................... 35
51 Gem ................................................ 23
52 Gem ................................................ 15
56 Gem ................................................ 17
63 Gem .................................................. 6
A
A. G. 140 ............................................. 13
A. G. 142 ............................................. 36
A. G. 144 ............................................. 32
J
Jonckheere 701 ...................................... 8
Jonckheere 728 .................................... 26
B
Ball 20.................................................. 11
Barton 2374 ........................................... 9
K
C
Kappa Gem .......................................... 30
Couteau 475......................................... 41
Couteau 928......................................... 33
L
D
N
Delta Gem............................................ 12
NGC 2339 ............................................ 28
NGC 2341 ............................................ 19
NGC 2357 ............................................ 20
NGC 2365 ............................................ 19
NGC 2370 ............................................ 20
NGC 2392 ............................................ 18
NGC 2407 ............................................ 43
NGC 2420 ............................................ 37
NGC 2481 ............................................ 38
Lambda Gem........................................ 24
E
Engelmann 30 ...................................... 16
H
h2372 ................................................... 16
h2418 ................................................... 31
h3299 ................................................... 40
h408 ..................................................... 10
h409 ....................................................... 5
-1-
Zone 137
O
STF 1041 rej ........................................ 25
STF 1047.............................................. 24
STF 1053................................................ 6
STF 1081................................................ 8
STF 1083................................................ 4
STF 1090.............................................. 21
STF 1094.............................................. 26
STF 1106.............................................. 22
STF 1108.............................................. 29
STF 1113 rej ........................................ 33
STF 1124.............................................. 29
STF 1129.............................................. 41
STF 1140.............................................. 39
STF 1147.............................................. 37
STF 1156.............................................. 31
STF 1158.............................................. 35
STF 1167.............................................. 39
OS 162 ................................................. 22
OS 164 rej............................................ 15
OS 168 rej............................................ 13
OS 183 rej............................................ 42
OSS 85................................................... 9
P
Pourteau 2595 ...................................... 11
Pourteau 2816 ...................................... 12
Pourteau 2835 ...................................... 33
S
Smart 72............................................... 26
Soulie 395 .............................................. 7
Soulie 422 ............................................ 40
South 548............................................. 14
STF 1017 ............................................. 23
STF 1023 ............................................... 7
STF 1027 ............................................. 21
STF 1035 ............................................... 4
Z
Zeta Gem................................................ 3
-2-
Zone 137
Zone 137, Map 1
Reference Star
Zeta Gem (43 Gem; Mekbuda, "the contracted" paw of a lion; Sh 77; HD 52973;
SAO 79031)
Position: 0704+2034
Mag : 3.80
Spectrum : G3 Ibv Color : Y
Assumed distance: 1,170 light years
Assumed luminosity (suns): 2,760
Observations:
C8 at 83x.
C11 at 115x. B and D were difficult.
Notes:
AB 1880: 87.2 @ 84. 1 measurements. A is a Cepheid, and an occultation double.
AC 1781: 91.9 @ 351. 36 measurements.
CD 1907: 27.2 @ 166. 3 measurements.
Hipparcos gives discordant distances: 1,170 light years to A, 89 to D. A and D also
have different proper motins.
This star is a Cepheid (10.15172 day period), discovered by J. Schmidt between 1844
and 1847; it is also an eclipsing binary. The Cepheid cycle swings from 4.4m (F7Ib) to
5.2m (G3Ib), with an abnormal light curve. It is also an infra-red source.
There are two optical companions: 10.5m (at 88- @ 84), and 8.0m (100+ @ 348).
From James Kaler's Star Notes:
Mekbuda is a supergiant, albeit as supergiants go a modest one. Its diameter is 60
times solar. If our Sun were Zeta Gem, it would appear some 30 degrees across, half
again as big as the constellation Gemini itself. Through a small telescope, Mekbuda
appears to have a faint companion a minute of arc away, but it is a line-of-sight accident.
The bright star itself, however, does seem to have a true faint companion that cannot be
resolved by eye at the telescope. None of these facts give the star any particular claim to
fame. What does is its changeability, for Zeta Gem is one of the sky's few easily visible
"Cepheid variable stars."
Cepheids are dying supergiants that have lost their sense of stability, and pulsate,
changing their diameters, temperatures (5,300 Kelvin to 5,800 for Mekbuda), classes (G
to F), and magnitudes. The first of these discovered was Delta Cephei, after which the
class of stars was named. It, Eta Aquilae, and the southern hemisphere's Beta Doradus are
all about the same apparent brightness, Mekbuda changing from magnitude 3.7 to 4.1 and
back every 10.2 days. Cepheids are enormously valuable stars, as their periods of
pulsation are firmly linked to their true luminosities: the longer the period, the more
luminous the star. Once we know the long-established relationship, we can find the true
-3-
Zone 137
luminosity of a Cepheid from only its period. From its luminosity and its apparent
brightness, we can calculate its distance. Cepheids allow us to find the distances of other
galaxies, helping us to explore the Universe. One of the key projects for the Hubble
Space Telescope is the measurement of the expansion rate of the Universe using distant
Cepheids to help measure distance. Though the four brightest Cepheids all look similar to
the eye, Mekbuda has the longest period, almost double that of Delta Cephei, making it
the most luminous of them and a true "gem" of a star.
Double Stars
Easy
STF 1035
Rating: 2 E
ADS 5858; HD 55005; SAO 79152
Position: 0712+2217
A
B
Magnitude
7.37
7.51
Separation PA
—
—
8.8 +
41 +
Year
—
1994
Spectra
F5 V
Colors
W
L
Notes:
1829: 8.5 @ 40. 47 measurements. The stars share common proper motion.
Observations:
C8 at 104x. Webb saw them both as Y and wrote, "Very pretty."
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 4.35 inches.
Separation: AB = 7.69 miles.
Distance (LY): 560
Total luminosity (Suns): 32
STF 1083
Rating: 2 E
ADS 6060; HD 58246; SAO 79375
Position: 0726+2030
A
B
Magnitude
6.92
7.79
Separation PA
—
—
6.7 +
46 +
-4-
Year
—
1991
Spectra
A5
Colors
Y
G
Zone 137
Notes:
1822: 6.3 @ 42. 67 measurements.
Observations:
C8 at 83x. Webb saw them as Y and bW.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 7.56 inches.
Separation: AB = 5.00 miles.
Distance (LY): 480
Total luminosity (Suns): 33
h409
A. G. 134; ADS 5722
Position: 0703+2427
A
B
C
Magnitude
9.26
9.96
10.29
Rating: 3 E
Separation
—
1.7 =
15.7 +
PA
—
202 =?
354 +
Year
—
1991
1958
Spectra
A5
Notes:
AB 1902: 1.7 @ 22. 14 measurements. Quadrant reversal?
AC 1903: 14.1 @ 352. 6 measurements.
Observations:
C8 at 104x. This pair lies at the S corner of a tiny version of "Gemini".
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 8.75 inches.
Separation: AB = X=1,003 feet; AC = 1.76 miles..
Distance (LY): 72
Total luminosity (Suns): 0.11
-5-
Colors
W
No
O?
Zone 137
STF 1053
Rating: 3 E
ADS 5945; HD 56152; SAO 79238
Position: 0717+2432
A
B
Magnitude
7.32
10.51
Separation PA
—
—
14.9 +
330 +
Year
—
1991
Spectra
A0
Colors
Y
R
Notes:
1831: 13.7 @ 310. 12 measurements.
Observations:
C8 at 83x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 5.86 inches.
Separation: AB = 12.3 miles.
Distance (LY): 530
Total luminosity (Suns): 32
63 Gem
Sh 368; ADS 6089; HD 58728; SAO 79403
Position: 0728+2127
A
B
C
D
Magnitude
5.26
10.92
10.50
9.09
Separation
—
42.9 +
145.9 +
3.9
Rating: 3 E
PA
—
324 +
219 =
219
Year
—
1917
1909
1991
Spectra
Colors
F5 IV+F5 V dY
R
W?
Notes:
AB 1863: 43: @ 324. 3 measurements. The primary is a spectroscopic binary with
an orbital period of 1.9327 days. It is also listed as McAllister 30 and has been measured
at 0.1 @ 352.
AC and AD, 1 measurement. The D star was discovered by the Hipparcos satellite.
Observations:
C8 at 104x.
-6-
Zone 137
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 8.32 inches.
Separation: AB = 7.43 miles; AC = 25.3 miles; AD = 3,538 feet; Aa = 160 feet.
Distance (LY): 111
Total luminosity (Suns): 8.4
Soulie 395
Position: 0704+2122
A
B
Magnitude
10.72
11.02
Rating: 4 E
Separation PA
—
—
11.6 342 +
Year
—
1991
Spectra
Colors
W
W
Notes:
1893: 14.0 @ 333. 4 measurements.
Observations:
C11 at 115x. It lies just S of a nice diamond of 10m stars.
Distance (LY): 49
Total luminosity (Suns): 0.02
STF 1023
Rating: 4 E
SAO 79098
Position: 0708+2459
A
B
Magnitude
8.91
9.44
Separation PA
—
—
24.2 105 +
Year
—
1991
Spectra
K5
Colors
Y
O
Notes:
1831: 24.7 @ 102. 16 measurements. The stars share a small common proper
motion.
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 36.2 inches.
Separation: AB = 2.19 miles.
Distance (LY): 58
Total luminosity (Suns): 0.14
-7-
Zone 137
Jonckheere 701
Rating: 4 E
ADS 5806
Position: 0709+2417
A
B
Magnitude
10.97
11.00
Separation PA
—
—
2.1 273 =
Year
—
1952
Spectra
Colors
W
W
Notes:
1892: 2.2 @ 273. 6 measurements.
Observations:
C11 at 339x.
Hough 345
Rating: 4 E
ADS 6022; HD 57590; SAO 79337
Position: 0723+2205
A
B
C
Magnitude
9.57
10.45
13.40
Separation
—
1.2 =
24.9 +
PA
—
286 +
227 -
Year
—
1991
Spectra
A0
Colors
W
W
?
Notes:
AB 1890: 1.2 @ 282. 18 measurements.
AC 1890: 24.3 @ 228. 3 measurements.
Observations:
C11 at 634x.
STF 1081
Rating: 4 E
ADS 6038; HD 57900; SAO 79361
Position: 0724+2128
A
B
C
Magnitude
7.30
8.61
9.20
Separation
—
1.9 +
107.2
PA
—
233 +
64
-8-
Year
—
1999
1865
Spectra
B9
Colors
W
No
bW
Zone 137
Notes:
AB 1828: 1.3 @ 216. 68 measurements.
AC 1 measurement.
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 4.80 inches.
Separation: AB = 1.89 miles; AC = 107 miles.
Distance (LY): 640
Total luminosity (Suns): 47
Barton 2374
Position: 0727+2218
A
B
Magnitude
10.29
11.20
Rating: 4 E
Separation PA
—
—
3.4 +
298 -
Year
—
1990
Spectra
Colors
W
W
Notes:
1894: 3.2 @ 299. 4 measurements.
Observations:
C11 at 115x.
Distance (LY): 1,720
Total luminosity (Suns): 25.4
OSS 85
Rating: 4 E
HD 58919; SAO 79416
Position: 0729+2439
A
B
Magnitude
7.61
9.02
Separation PA
—
—
62.8 +
21 -
Notes:
1875: 56.3 @ 27. 15 measurements.
The stars share common proper motion.
-9-
Year
—
1993
Spectra
F8 V
F0
Colors
W
bW
Zone 137
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 3.60 inches; B = 11.1 inches.
Separation: AB = 37.2 miles.
Distance (LY): 380
Total luminosity (Suns): 13
h408
Position: 0703+2322
A
B
Magnitude
9.77
12.26
Rating: 5 E
Separation PA
—
—
14.6 +
74 +
Year
—
1991
Spectra
Colors
W
B
Notes:
1892: 14.5 @ 65. 6 measurements.
Observations:
C11 at 115x.
Hussey 454
Rating: 5 E
ADS 5773; HD 53383; SAO 79049
Position: 0706+2142
A
B
C
Magnitude
9.44
11.8.
11.00
Separation
—
1.5 13.1 =
PA
—
216 43 -
Notes:
AB 1902: 2.0 @ 218. 8 measurements.
AC 1911: 13.1 @ 46. 2 measurements.
Observations:
C11 at 115x. B was not detected.
- 10 -
Year
—
1933
1925
Spectra
A
Colors
W
No
W?
Zone 137
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 8.22 inches.
Separation: AB = 845 feet; AC = 1.41 miles.
Distance (LY): 69
Total luminosity (Suns): 0.08
Pourteau 2595
Position: 0715+2345
A
B
Magnitude
10.55
10.73
Rating: 5 E
Separation PA
—
—
18.1 +
51 -
Year
—
1956
Spectra
Colors
W
W
Notes:
1909: 17.4 @ 54. 2 measurements.
Observations:
C11 at 115x.
Ball 20
Rating: 5 E
HD 55847; SAO 79216
Position: 0716+2158
A
B
Magnitude
7.02
10.44
Separation PA
—
—
95 =
264 =
Notes:
1879: 95 @ 264. 3 measurements.
The stars have different proper motions.
Observations:
C11 at 115x.
- 11 -
Year
—
1919
Spectra
K5 III
Colors
Y
W?
Zone 137
Pourteau 2816
Rating: 5 E
SAO 79433
Position: 0730+2303
A
B
Magnitude
9.10
12.89
Separation PA
—
—
24.9 +
193 -
Year
—
1954
Spectra
G5
Colors
O
W?
Notes:
1892: 24.7 @ 194. 2 measurements.
Observations:
C8 at 104x. Use averted vision to see B.
Moderate
Delta Gem
Rating: 2 M
55 Gem; Wasat, "the middle"; Chevalier 85; STF 1066; ADS 5983; HD 56986; SAO
79294
Position: 0720+2159
A
B
Magnitude
3.55
8.18
Separation PA
—
—
5.9 224 +
Year
—
1997
Spectra
F0 IV
K6 V
Colors
Y
rO!
Notes:
1822: 7.1 @ 198. Over 100 measurements.
Star A is a long-period eclipsing spectroscopic binary with a period of 6.13 years. It
is also an infra-red source as well as an occultation binary. The AaxB orbital period may
be 1,200 years (Hopmann, 1960). (Another orbital solution suggests 3,168 years.) The
stars are about 95 AU apart.
Sadler found a faint companion: 85 @ 180.
In February, 1930, Clyde Tombaugh of Lowell Observatory (Flagstaff, AZ)
discovered Pluto near here.
From James Kaler's Star Notes:
Wasat marks the famed and last planet Pluto, as Clyde Tombaugh discovered the
body close to the star in 1930. The star is also somewhat more solar than most of its
naked-eye brethren, a class F "subgiant" with a temperature of 6,700 Kelvin, only 1,000
Kelvin hotter than the Sun. Subgiants are stars that are in the first stages of expanding to
- 12 -
Zone 137
gianthood after the central nuclear fire goes out, so Wasat is now beginning to expire. It
will soon be a "gap" star like Caph (Beta Cassiopeiae). Tucked next to it is a cooler
ordinary class K companion, easily seen through a small telescope, that is 1,200 Kelvin
cooler than the Sun. Over 100 times the Earth-Sun distance from Wasat proper, the
companion takes 1,200 years to orbit. Wasat itself may be a close inseparable double,
though no one is sure. Keep your eye on this star: Pluto will pass it again in just 179
years.
Observations:
C8 at 206x. Star B is hard to see in the glare, even with a diffraction mask. Some
observers report Y and R (Webb) or, or bW and Y, or see both as white.
C11 at 115x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 8.40 inches; B = 35.0 inches.
Separation: AB = 2,851 feet.
Distance (LY): 59
Total luminosity (Suns): 11.04
A. G. 140
Hough 628; ADS 6063;
Position: 0726+2205
A
B
Magnitude
9.89
10.57
Rating: 3 M
Separation PA
—
—
1.9 175 =
Year
—
1992
Spectra
F8
Colors
W
O?
Notes:
1898: 2.2 @ 175. 13 measurements.
Observations:
C11 at 339x.
OS 168 rej
Rating: 4 M
ADS 5873; HD 55201; SAO 79174
Position: 0713+2121
A
B
C
Magnitude
7.30
11.55
10.08
Separation
—
24.0 +
51.8 +
PA
—
67 =
114 -
- 13 -
Year
—
1900
1900
Spectra
G5
Colors
Y
?
?
Zone 137
Notes:
AB 1868: 22.7 @ 67. 4 measurements.
AC 1868: 51.3 @ 116. 4 measurements.
Observations:
C8 at 83x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 18.5 inches.
Separation: AB = 51.7 miles; AC = 112 miles.
Distance (LY): 1,380
Total luminosity (Suns): 208
h416
Rating: 4 M
ADS 5973
Position: 0719+2243
A
B
Magnitude
10.38
10.40
Separation PA
—
—
9.3 76 -
Year
—
1959
Spectra
G
Colors
yW
W
Notes:
1893: 9.4 @ 79. 6 measurements.
Observations:
C11 at 115x.
Difficult
South 548
Espin 2625 (AB); ADS 6087; HD 58712; SAO 79401
Position: 0728+2209
A
B
C
Magnitude
6.78
12.10
8.91
Separation
—
11.5 +
35.4 -
PA
—
19 277 +
Observations:
C8 at 206x.
- 14 -
Year
—
1901
1991
Rating: 3 D
Spectra
K5
Colors
R!
?
B!
Zone 137
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 31.6 inches.
Separation: AB = 28.7 miles; AC = 88.4 miles.
Distance (LY): 1,600
Total luminosity (Suns): 463
OS 164 rej
Rating: 4 D
ADS 5775; HD 53472; SAO 79054
Position: 0706+2452
A
B
Magnitude
6.89
10.30
Separation PA
—
—
9.8 +
63 +
Year
—
1963
Spectra
K8 III
Colors
W
?
Notes:
1843: 9.1 @ 48. 9 measurements.
Observations:
C8 at 83x. Webb saw them both as Y.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 60.0 inches.
Separation: AB = 15.8 miles.
Distance (LY): 1,030
Total luminosity (Suns): 106
52 Gem
Hough 343; ADS 5909; HD 55621; SAO 79199
Position: 0715+2453
A
B
Magnitude
5.84
12.70
Separation PA
—
—
23.9 +
265 +
Notes:
1890: 22.4 @ 257. 7 measurements.
Observations:
C11 at 115x. Nice golden tone in A.
- 15 -
Rating: 5 D
Year
—
1910
Spectra
M1 IIIv
Colors
Y!!
?
Zone 137
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 1.20 inches.
Separation: AB = 12.6 miles.
Distance (LY): 337
Total luminosity (Suns): 41
Engelmann 30
Bpm 99 (a, b); HD 55579; SAO 79191
Position: 0715+2443
A
B
C
D
Magnitude
6.89
12.31
10.62
10.40
Separation
—
49.1 +
127.4 93.4
Rating: 5 D
PA
—
18 =
108 =
193
Year
—
1921
Spectra
A1pSrCr
Colors
W
?
?
?
Notes:
AB 1907: 49.0 @ 18. 2 measurements.
AC 1886: 127.5 @ 108. 5 measurements.
AD 1907. 1 measurement.
Observations:
C11 at 115x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 6.09 inches.
Separation: AB = 52.1 miles; AC = 135 miles; AD = 99.1 miles.
Distance (LY): 680
Total luminosity (Suns): 68
h2372
Rating: 5 D
HD 56913; SAO 79288
Position: 0720+2028
A
B
Magnitude
7.81
12.57
Separation PA
—
—
22.4
3
Notes:
1 measurement.
- 16 -
Year
—
1901
Spectra
G0
Colors
Y
?
Zone 137
Observations:
C11 at 115x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 16.7 inches.
Separation: AB = 100 miles.
Distance (LY): 2,860
Total luminosity (Suns): 487
56 Gem
Bur 1413; ADS 6016; HD 57423; SAO 79328
Position: 0722+2027
A
B
BC
Magnitude
5.09
12.20
Separation
—
16.5 8.2 +
PA
—
202 246 +
Rating: 5 D
Year
—
1935
1935
Notes:
AB 1901: 17.8 @ 205. 3 measurements.
BC 1900: 7.7 @ 245. 2 measurements.
A is a suspected variable.
Observations:
C11 at 115x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 63.0 inches.
Separation: AB = 11.0 miles.
Distance (LY): 429
Total luminosity (Suns): 133
- 17 -
Spectra
M0 IIIab
Colors
Y!
?
No
Zone 137
Deep Sky Objects
Easy
NGC 2392
Rating: 2 E
Other Names: Eskimo Nebula; Clown Face Nebula; PK 197+17.1; H IV 45
Astronomical League Program: Caldwell Club, Herschel 400 Club, Urban Deep Sky
Club
Position: 0729+2055
Type: Pn
Dimensions: 40" x 43"
Class: 3b
Magnitude: 8.0
Notes:
It was discovered by William
Herschel in 1787. He called it, "a very
remarkable phenomenon."
The filaments are racing outward at
68 mps. The central star (10.5m) is
40,000o K on the surface and is an O8
star with 40 times the Sun's brightness.
Observations:
C8 at 206x. Very large and bright
and seen face on. The central star
(10.5m) is visible at high powers. It has
a distinct green tint. Try "blinking" this
nebula— that is, look directly at the
central star, then use averted vision to see
the nebula. The effect can be fascinating
as you bring different parts of your retina
into use. A bright star lies a little N.
NGC 2392 (The Eskimo Nebula)
Planetary Nebula (3b)
Observed with C8 on 2/1/92
Magnification: 200x
Model (where the Sun is a baseball):
Its diameter would be 201 miles.
Distance (LY): 3,000
Luminosity (suns): 450
- 18 -
Zone 137
Moderate
NGC 2341
Other Names: UGC 3708
Rating: 4 M
Position: 0709+2036
Type: Gal
Surface brightness: 12.6
Class: Sab pec
Dimensions: 0.9' x 0.9'
Magnitude: 13.2
PA: 136
Observations:
C8 at 206x. At 104x, this and NGC 2342 (just to the N of it) look like barely out-offocus stars. At 200x, 2341 is amorphous, but has a sharp, stellar nucleus.
Radial velocity (km/sec): +5,227
Difficult
NGC 2365
Other Names: UGC 3821
Rating: 4 D
Position: 0723+2204
Type: Gal
Surface brightness: 13.8
Class: SABa
Dimensions: 3.0' x 1.6'
Magnitude: 12.4
PA: 170
Observations:
C8 at 206x. I had to use tube movement to confirm its presence. I could only see the
nucleus, which appeared as a fuzzy star. A pair of 9m stars ot the E is tough on the
seeing. Use high power and get them out of the view. An 11m pair (about 10"
separation) lies 3 min W.
Radial velocity (km/sec): +2,278
- 19 -
Zone 137
NGC 2357
Other Names: UGC 3782
Rating: 5 D
Position: 0718+2321
Type: Gal
Surface brightness: 13.7
Class: Sc
Dimensions: 3.7' x 0.5'
Magnitude: 13.3
PA: 122
Observations:
C8 at 206x. Only the nucleus was visible, and even it was very faint and difficult.
Radial velocity (km/sec): +2,275
NGC 2370
Other Names: UGC 3835
Rating: 5 D
Position: 0725+2347
Type: Gal
Surface brightness: 12.9
Class: SB?
Dimensions: 1.1' x 0.6'
Magnitude: 13.6
PA: 43
Observations:
C8 at 104x. The field is strewn with 12 and 13m stars. This galaxy appears as one of
those stars that cannot quite be focused. It lies 4 min S of a 12m star.
Radial velocity (km/sec): +5,500
- 20 -
Zone 137
Zone 137, Map 2
Double Stars
Easy
STF 1027
Rating: 2 E
ADS 5816; HD 54244; SAO 96547
Position: 0709+1654
A
B
Magnitude
7.70
7.95
Separation PA
—
—
6.9 +
357 +
Year
—
1991
Spectra
K3 III
Colors
rO
rO
Notes:
1830: 6.7 @ 356. 29 measurements. The stars show similar proper motions.
Observations:
C8 at 83x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 51.3 inches.
Separation: AB = 25.3 miles.
Distance (LY): 2,350
Total luminosity (Suns): 600
STF 1090
Rating: 2 E
ADS 6073; HD 58453; SAO 96897
Position: 0727+1831
A
B
C
Magnitude
7.26
8.10
9.92
Separation
—
61.0 48.9 +
PA
—
99 +
80 -
Year
—
1987
1959
Spectra
F0 V
F0 IV
Colors
W
Y
R?
Notes:
AB 1830: 61.1 @ 98. 18 measurements. The stars share common proper motion.
AC 1863: 47.7 @ 81. 7 measurements. Different proper motions.
- 21 -
Zone 137
Observations:
C8 at 83x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 5.70 inches; B = 10.5 inches.
Separation: AB = 49.5 miles; AC = 39.7 miles.
Distance (LY): 520
Total luminosity (Suns): 44
STF 1106
Position: 0728+1558
A
B
Magnitude
9.40
9.47
Rating: 3 E
Separation PA
—
—
10.8 +
34 +
Year
—
1991
Spectra
G0
G0
Colors
B!
O!
Notes:
1828: 10.6 @ 31. 20 measurements. The stars have different proper motions.
Observations:
C8 at 104x.
OS 162
Rating: 4 E
ADS 5660; HD 51911; SAO 96359
Position: 0700+1556
A
B
Magnitude
7.05
12.14
Separation PA
—
—
21.2 +
155 -
Year
—
1924
Notes:
1843: 13.5 @ 165. 10 measurements.
Observations:
C8 at 83x. Bright but moderate field.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 32.4 inches.
Separation: AB = 22.8 miles.
Distance (LY): 690
Total luminosity (Suns): 54
- 22 -
Spectra
G0 III
Colors
yW
?
Zone 137
STF 1017
Rating: 4 E
ADS 5794; HD 53817
Position: 0707+1650
A
B
Magnitude
8.80
9.90
Separation PA
—
—
12.8 +
255 +
Year
—
1963
Spectra
G
F8
Colors
O
B
Notes:
1828: 12.2 @ 254. 13 measurements. The stars show a similar, but small, proper
motion.
Observations:
C8 at 104x. There are many faint doublets in the area.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 20.3 inches; B = 16.7 inches.
Separation: AB = 4.75 miles.
Distance (LY): 238
Total luminosity (Suns): 5.4
51 Gem
BQ Gem; HD 55383; SAO 96638; H VI 74 (AB)
Position: 0713+1609
A
B
C
Magnitude
5.07
11.19
11.17
Separation
—
150.7 +
200.0 -!
PA
—
19 45 +!
Rating: 4 E
Year
—
1991
1925
Spectra
M III
Colors
yO!
W
W
Notes:
AB 1896: 148.0 @ 21. 8 measurements. The primary is an infra-red source and is a
semi-regular variable.
AC 1901: 222.9 @ 37. 3 measurements.
This system is part of the Wolf 630 Group.
Observations:
C8 at 104x. You'll need averted vision to see the companions.
- 23 -
Zone 137
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 70.5 inches.
Separation: AB = 165 miles; AC = 218 miles.
Distance (LY): 700
Total luminosity (Suns): 304
STF 1047
Fox 154 (D); A 2526 (BC); ADS 5908; HD 55625; SAO 96665
Position: 0715+1546
A
B
C
D
BC
Magnitude
8.07
9.66
11.40
11.40
Separation PA
—
—
23.8 +
29 +
42.0
0.3 -
330
320 -
Year
—
1991
Rating: 4 E
Spectra
F2 III
1924
1996
Colors
Y
B
No
No
Notes:
AB 1828: 20.7 @ 19. 17 measurements. Hipparcos/Tycho data show different
distances for these stars; they may be optical.
BC 1913: 0.6 @ 337. 5 measurements.
AD 1 measurement.
Observations:
C8 at 65x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 24.9 inches.
Separation: AB = 5.83 miles; AC = 10.3 miles; BC = 388 feet.
Distance (LY): 157
Total luminosity (Suns): 1.4
Lambda Gem
54 Gem; STF 1061; ADS 5961; HD 56537; SAO 96746
Position: 0718+1632
A
B
Magnitude
3.58
10.70
Separation PA
—
—
9.8 +
33 +
- 24 -
Year
—
1953
Rating: 4 E
Spectra
A3 V
Colors
W
R
Zone 137
Notes:
1829: 9.6 @ 31. 18 measurements.
Star A is an eclipsing spectroscopic binary as well as an occultation binary. It may
also be a Delta Scuti variable. It rotates at 154 kps and is 1.7 times bigger than the Sun.
The system is a part of the Ursa Major moving stream. Both stars share the same proper
motion.
Observations:
C8 at 206x. Some observers (including Webb) note colors of G and B.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 5.10 inches.
Separation: AB = 1.43 miles.
Distance (LY): 94
Total luminosity (Suns): 25.04
STF 1041 rej
Rating: 5 E
SAO 96649
Position: 0714+1746
A
B
Magnitude
9.30
11.70
Separation PA
—
—
25.2
267
Year
—
1906
Notes:
1 measurement.
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 6.60 inches.
Separation: AB = 5.00 miles.
Distance (LY): 127
Total luminosity (Suns): 0.22
- 25 -
Spectra
A0
Colors
W
?
Zone 137
Smart 72
Position: 0718+1523
A
B
Magnitude
9.56
11.47
Rating: 5 E
Separation PA
—
—
15.3 137 -
Year
—
1991
Spectra
Colors
W
W
Notes:
1896: 15.5 @ 139. 5 measurements.
Observations:
C8 at 104x.
Moderate
STF 1094
Rating: 2 M
ADS 6086; HD 58729; SAO 96914
Position: 0727+1519
A
B
Magnitude
7.61
8.63
Separation PA
—
—
2.4 =
97 +
Year
—
1997
Spectra
A0 V
Colors
W
R
Notes:
1829: 2.4 @ 96. 37 measurements.
Observations:
C8 at 206x.
Distance (LY): 2,000
Total luminosity (Suns): 540
Jonckheere 728
Rating: 5 M
ADS 5779; HD 53506
Position: 0706+1903
A
B
Magnitude
8.58
9.52
Separation PA
—
—
3.0 +
71 -
Notes:
1912: 2.1 @ 72. 10 measurements.
- 26 -
Year
—
1991
Spectra
G5
Colors
Y
O
Zone 137
Observations:
C8 at 280x. This pair is the NE vertex of a roughly equilateral triangle with two other
9m stars.
Rich field.
Hough 346
Rating: 5 M
ADS 6064; HD 58338; SAO 96888
Position: 0726+1809
A
B
Magnitude
6.93
11.70
Separation PA
—
—
12.8 +
57 -
Year
—
1930
Notes:
1891: 12.7 @ 58. 4 measurements.
Observations:
C8 at 104x. Use averted vision to see B.
Faint but moderate field.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 18.0 inches.
Separation: AB = 44.9 miles.
Distance (LY): 2,250
Total luminosity (Suns): 708
- 27 -
Spectra
G5
Colors
Y
W
Zone 137
Deep Sky Objects
Moderate
NGC 2339
Other Names: UGC 3693; H II 769
Astronomical League Program: Herschel II Club
Rating: 5 M
Position: 0708+1900
Type: Gal
Surface brightness: 13.2
Class: SAB(rs)bc
Dimensions: 2' x 1'
Magnitude: 12.5
PA: 175
Observations:
C8 at 83x. It looks like a smudgy star. Use high power. The axis runs N-S.
Moderate field.
Distance (LY): 100,000,000
Radial velocity (km/sec): +2,206
Total luminosity (Suns): 7,900,000,000
- 28 -
Zone 137
Zone 137, Map 3
Double Stars
Easy
STF 1108
Rating: 1 E
ADS 6160; HD 59878; SAO 79489
Position: 0733+2253
A
B
Magnitude
6.54
8.80
Separation PA
—
—
11.9 +
179 =
Year
—
1991
Spectra
K0 II/III
G5
Colors
Y!
B!
Notes:
1827: 11.5 @ 179. 27 measurements. Star A is a spectroscopic binary. The stars
share common proper motion.
Observations:
C8 at 83x. Webb saw them as Y and B, and wrote, "Beautiful!" Jim Jones (Lake
Oswego, OR; 8" SCT)— measured 11.2" with a MicroGuide.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 17.5 feet.
Separation: AB = 8.80 miles.
Distance (LY): 474
Total luminosity (Suns): 50
STF 1124
Rating: 3 E
ADS 6272; HD 61604; SAO 79609
Position: 0741+2150
A
B
Magnitude
9.10
9.20
Separation PA
—
—
19.0 326 =
- 29 -
Year
—
1979
Spectra
A5
A5
Colors
B
G
Zone 137
Notes:
1828: 19.4 @ 326. 26 measurements. Hipparcos/Tycho data show different
distances for these stars; they may be optical. However, the stars exhibit common proper
motion.
Observations:
C8 at 83x. Some observers report both as W.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 8.67 inches; B = 8.72 inches.
Separation: AB = 4.35 miles.
Distance (LY): 147
Total luminosity (Suns): 0.8
Kappa Gem
77 Gem; OS 179; ADS 6321; HD 62345; SAO 79653
Position: 0744+2424
A
B
Magnitude
3.57
8.10
Separation PA
—
—
6.9 +
241 +
Year
—
1996
Rating: 3 E
Spectra
G8 III
Notes:
1832: 6.3 @ 225. 73 measurements.
The primary is an infra-red source.
They share proper motion.
Observations:
C8 at 206x. Some observers report W for both stars, or yO and W.
Webb wrote, "Very delicate and beautiful."
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 43.5 inches.
Separation: AB = 1.53 miles.
Distance (LY): 143
Total luminosity (Suns): 59.9
- 30 -
Colors
Y
B
Zone 137
h2418
Position: 0751+2001
A
B
Magnitude
10.07
10.02
Rating: 3 E
Separation PA
—
—
21.5 217 =
Year
—
1980
Spectra
A0
F2
Colors
W
W
Notes:
1880: 21.9 @ 217. 6 measurements.
The stars have different proper motions.
Observations:
C11 at 115x.
h432
Sinachopoulos 33 (C); SAO 79776
Position: 0753+2050
A
B
Magnitude
9.72
9.81
Rating: 3 E
Separation PA
—
—
14.5 +
276 +?
Year
—
1991
Spectra
G5
G5
Colors
Y
Y
Notes:
1893: 12.9 @ 91. 13 measurements. Quadrant reversal?
The stars have different proper motions.
Observations:
C11 at 115x. C was not detected.
STF 1156
STF 1163; HD 64682; SAO 79803
Position: 0756+2440
A
B
Magnitude
7.70
10.67
Rating: 3 E
Separation PA
—
—
19.1 +
160 +
- 31 -
Year
—
1991
Spectra
K0
Colors
yO
rO
Zone 137
Notes:
1827: 18.6 @ 159. 8 measurements. Hipparcos/Tycho data show different distances
for these stars; they may be optical.
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 23.8 inches.
Separation: AB = 82.0 miles.
Distance (LY): 2,750
Total luminosity (Suns): 531
A. G. 144
Couteau 927; ADS 6411
Position: 0752+2215
A
B
Magnitude
8.28
10.58
Rating: 4 E
Separation PA
—
—
11.8 +
331 +
Year
—
1924
Spectra
F5
Notes:
1902: 11.1 @ 330. 3 measurements.
B has an 11.24m companion at 0.9 @ 208.
Observations:
C8 at 104x. It is bracketed, east and west, by a pair of 8m stars.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 13.3 inches.
Separation: AB = 1.54 miles.
Distance (LY): 84
Total luminosity (Suns): 0.296
- 32 -
Colors
W
bW
Zone 137
Couteau 928
Rating: 4 E
SAO 79764
Position: 0753+2003
A
B
Magnitude
9.27
9.70
Separation PA
—
—
5.4 99 =
Year
—
1972
Spectra
K0
Colors
O
O!
Notes:
1894: 5.5 @ 99. 2 measurements.
The Tycho-2 Catalog indicates a single star entry.
Observations:
C8 at 104x. It is part of a small right triangle.
STF 1113 rej
h425; HD 60336; SAO 79523
Position: 0735+2416
A
B
C
BC
Magnitude
8.10
10.10
10.70
Rating: 5 E
Separation PA
—
—
91.3
179
8.1 -
46 =
Year
—
1892
Spectra
M5
Colors
dO!
W?
?
1914
Notes:
AB 1 measurement.
BC 1892: 8.4 @ 46. 2 measurements.
Observations:
C8 at 280x. Star B is very difficult and will require averted vision.
Pourteau 2835
Rating: 5 E
SAO 79518
Position: 0735+2450
A
B
Magnitude
9.44
11.70
Separation PA
—
—
7.3 29 -!
- 33 -
Year
—
1954
Spectra
K0
Colors
O
W
Zone 137
Notes:
1902: 7.9 @ 45. 2 measurements.
Observations:
C11 at 115x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 26.4 inches.
Separation: AB = 6.15 miles.
Distance (LY): 540
Total luminosity (Suns): 4.30
h428
Rating: 5 E
HD 62568; SAO 79670
Position: 0745+2051
A
B
Magnitude
8.24
13.01
Separation PA
—
—
14.3 +
279 -
Year
—
1911
Notes:
1894: 14.2 @ 280. 2 measurements.
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 6.21 inches.
Separation: AB = 8.74 miles.
Distance (LY): 392
Total luminosity (Suns): 6.3
- 34 -
Spectra
A0
Colors
W
W
Zone 137
STF 1158
Rating: 5 E
ADS 6472; HD 64813; SAO 79813
Position: 0756+2153
A
B
C
D
E
Magnitude
9.50
10.20
12.50
Separation
—
7.6 +
20.4 +
63.6 58.4
PA
—
334 +
249 307 +
154
Year
—
1987
1987
1987
1907
Spectra
A5 III
Colors
W
bW
?
No
No
Notes:
AB 1829: 7.5 @ 333. 14 measurements.
AC 1905: 19.0 @ 269. 4 measurements.
AD 1907: 65.3 @ 305. 2 measurements.
AE 1 measurement.
Observations:
C8 at 104x. The C star is extremely difficult and will require high power and averted
vision.
Moderate
Hussey 707
Rating: 4 M
ADS 6176; HD 60256; SAO 79514
Position: 0734+2138
A
B
Magnitude
8.98
10.80
Separation PA
—
—
2.5 =
19 =
Notes:
1903: 2.5 @ 19. 9 measurements.
Observations:
C11 at 339x.
- 35 -
Year
—
1987
Spectra
A3
Colors
W
W
Zone 137
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 7.83 inches.
Separation: AB = 2.26 miles.
Distance (LY): 580
Total luminosity (Suns): 7.99
A. G. 142
Rating: 4 M
ADS 6277
Position: 0741+2312
A
B
Magnitude
9.81
10.45
Separation PA
—
—
1.7 +
18 =
Year
—
1991
Spectra
A5
Colors
W
W
Notes:
1902: 1.6 @ 18. 11 measurements.
Observations:
C11 at 339x.
Hough 523
Rating: 4 M
ADS 6286
Position: 0742+2138
A
B
C
Magnitude
9.49
11.20
11.70
Separation
—
8.6 =
34.0
PA
—
324 +
329
Notes:
AB 1894: 8.6 @ 323. 6 measurements.
AC 1894. 1 measurement.
Observations:
C11 at 115x. C was very difficult.
- 36 -
Year
—
1930
Spectra
F5
Colors
W
W?
?
Zone 137
Difficult
STF 1147
Rating: 3 D
ADS 6394; SAO 79735
Position: 0751+2432
A
B
Magnitude
9.66
9.68
Separation PA
—
—
2.3 171 +
Year
—
1991
Spectra
G0
Colors
Y
Y
Notes:
1830: 2.5 @ 162. 32 measurements.
Observations:
C8 at 280x. A 7.5m star lies 10 min W.
Deep Sky Objects
Moderate
NGC 2420
Rating: 2 M
Other Names: Melotte 69; Collinder 154; Raab 56; Hagen 4; H VI 1
Astronomical League Program: Herschel 400 Club
Position: 0739+2134
Type: Oc
Dimensions: 10'
Class: I 1r
Cluster population: 100
Magnitude: 8.3
Notes:
It is 1.1 billion years old. It contains one Ba supergiant, and lies 33,500 light years
from the galactic center and 2,100 light years above the galactic plane.
Observations:
C8 at 206x. Rich and misty at low powers, it was resolved at high powers. Since it
lies near the ecliptic, it often gets occulted by Solar System members. It is well-seen with
averted vision. Barbara Wilson, an amateur from Texas, says this cluster looks like a
crab to her. Glenn Bock, another amateur, writes that the cluster has a Y shape. And to
Steve Coe, it is reminiscent of Corona Borealis.
C11 at 115x. A small dense knot of 16 stars in a "7" shape.
- 37 -
Zone 137
Model (where the Sun is a baseball):
Its diameter would be 7,680 miles and its stars would be 830 miles apart.
Distance (LY): 10,060
Luminosity (suns): 3,800
NGC 2420
Open cluster (I 1 r; 100 stars)
Observed with C8 on 2/1/92
Magnification: 80x
Difficult
NGC 2481
Other Names: H II 302; UGC 4118
Position: 0757+2346
Type: Gal
Surface brightness: 12.4
Rating: 4 D
Class: E?
Dimensions: 1.4' x 0.5'
Magnitude: 12.9
PA: 18
Observations:
C11 at 98x. Small, round spot without a nucleus. It is 5 min W of a narrow 11m-12m
triangle.
Radial velocity (km/sec): +2,332
- 38 -
Zone 137
Zone 137, Map 4
Double Stars
Easy
STF 1140
Rating: 1 E
ADS 6376; HD 63210; SAO 97260
Position: 0748+1820
A
B
Magnitude
6.70
8.37
Separation PA
—
—
6.4 +
274 =
Year
—
1991
Spectra
K0 III
Colors
Y
dB!!
Notes:
1829: 6.2 @ 274. 33 measurements.
Observations:
C8 at 83x. Webb saw them as Y and B!
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 46.2 inches.
Separation: AB = 6.09 miles.
Distance (LY): 610
Total luminosity (Suns): 84
STF 1167
Rating: 4 E
ADS 6489
Position: 0759+1628
A
B
Magnitude
9.70
11.50
Separation PA
—
—
12.3 +
228 =
Year
—
1904
Spectra
G0
Notes:
1830: 12.0 @ 228. 4 measurements.
Observations:
C8 at 104x. A 7m Y star lies 5 min N and scorches the whole field!
- 39 -
Colors
Y
?
Zone 137
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 18.6 inches.
Separation: AB = 18.4 miles.
Distance (LY): 960
Total luminosity (Suns): 12
Soulie 422
Rating: 5 E
HD 60300; SAO 97031
Position: 0735+1724
A
B
Magnitude
9.00
10.40
Separation PA
—
—
23.3
268
Year
—
1984
Spectra
A
Colors
W
W?
Notes:
1 measurement.
Observations:
C11 at 98x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 8.03 inches.
Separation: AB = 11.3 miles.
Distance (LY): 311
Total luminosity (Suns): 2.42
h3299
Position: 0746+1713
A
B
Magnitude
10.81
11.31
Rating: 5 E
Separation PA
—
—
19.5 =
240 +
Notes:
1895: 19.5 @ 239. 3 measurements.
Observations:
C11 at 98x.
- 40 -
Year
—
1991
Spectra
Colors
W
W
Zone 137
Couteau 475
Rating: 5 M
HD 60471; SAO 97053
Position: 0736+1950
A
B
Magnitude
8.52
12.10
Separation PA
—
—
19.3 82 +
Year
—
1991
Spectra
A3
Colors
W
?
Notes:
1894: 19.5 @ 79. 5 measurements.
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 7.63 inches.
Separation: AB = 26.8 miles.
Distance (LY): 890
Total luminosity (Suns): 21
Difficult
STF 1129
A 2876 (B); ADS 6287; HD 61787; SAO 97148
Position: 0742+1803
A
B
C
D
Magnitude
8.97
10.22
9.10
10.90
Separation
—
1.0 +
21.6 33.0
PA
—
197 =
64 +
334
Notes:
AB 1914: 0.8 @ 197. 9 measurements.
AC 1828: 21.7 @ 63. 18 measurements.
AD 1 measurement.
Observations:
C8 at 104x.
- 41 -
Rating: 4 D
Year
—
1991
1991
1984
Spectra
G4 IV
F5
Colors
Y
?
B
No
Zone 137
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 9.30 inches; B = 14.7 inches.
Separation: AB = 2.71 miles; AC = 58.7 miles; AD = 89.6 miles.
Distance (LY): 1,740
Total luminosity (Suns): 159
OS 183 rej
Rating: 5 D
ADS 6440; HD 64330; SAO 97348
Position: 0754+1602
A
B
Magnitude
7.24
13.44
Separation PA
—
—
16.0 26 +
Year
—
1932
Notes:
1878: 16.2 @ 20. 5 measurements.
Observations:
C8 at 83x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 6.72 inches.
Separation: AB = 11.4 miles.
Distance (LY): 456
Total luminosity (Suns): 23
- 42 -
Spectra
A2
Colors
W
?
Zone 137
Deep Sky Objects
Difficult
NGC 2407
Other Names: UGC 3896
Rating: 4 D
Position: 0732+1821
Type: Gal
Surface brightness: 13.0
Class: S0-:
Dimensions: 1.0' x 0.8'
Magnitude: 13.4
PA: 75
Observations:
C8 at 206x. It is an extremely faint and fuzzy E-W oval best seen with averted vision.
With direct vision, all you can see is a fuzzed star. The nucleus is stellar.
Radial velocity (km/sec): +8,403
- 43 -
Zone 137
Zone 137 Mini-Catalog
Double Stars
Designation
Position
Rating
Map
STF 1108
0733+2253
1E
3
STF 1140
0748+1820
1E
4
STF 1027
0709+1654
2E
2
STF 1035
0712+2217
2E
1
STF 1083
0726+2030
2E
1
STF 1090
0727+1831
2E
2
h409
0703+2427
3E
1
STF 1053
0717+2432
3E
1
63 Gem
0728+2127
3E
1
STF 1106
0728+1558
3E
2
STF 1124
0741+2150
3E
3
Kappa Gem
0744+2424
3E
3
h2418
0751+2001
3E
3
h432
0753+2050
3E
3
STF 1156
0756+2440
3E
3
OS 162
0700+1556
4E
2
Soulie 395
0704+2122
4E
1
STF 1017
0707+1650
4E
2
STF 1023
Jonckheere
701
0708+2459
4E
1
0709+2417
4E
1
51 Gem
0713+1609
4E
2
Component
A
B
A
B
A
B
A
B
A
B
A
B
C
A
B
C
A
B
A
B
C
D
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
- 44 -
Mag
6.54
8.80
6.70
8.37
7.70
7.95
7.37
7.51
6.92
7.79
7.26
8.10
9.92
9.26
9.96
10.29
7.32
10.51
5.26
10.92
10.50
9.09
9.40
9.47
9.10
9.20
3.57
8.10
10.07
10.02
9.72
9.81
7.70
10.67
7.05
12.14
10.72
11.02
8.80
9.90
8.91
9.44
10.97
11.00
5.07
11.19
11.17
Separation
—
11.9 +
—
6.4 +
—
6.9 +
—
8.8 +
—
6.7 +
—
61.0 48.9 +
—
1.7 =
15.7 +
—
14.9 +
—
42.9 +
145.9 +
3.9
—
10.8 +
—
19.0 —
6.9 +
—
21.5 —
14.5 +
—
19.1 +
—
21.2 +
—
11.6 —
12.8 +
—
24.2 —
2.1 —
150.7 +
200.0 -!
PA
—
179 =
—
274 =
—
357 +
—
41 +
—
46 +
—
99 +
48.9 +
—
202 =?
15.7 +
—
330 +
—
324 +
145.9 +
3.9
—
34 +
—
326 =
—
241 +
—
217 =
—
276 +?
—
160 +
—
155 —
342 +
—
255 +
—
105 +
—
273 =
—
19 200.0 -!
Zone 137
Designation
STF 1047
Position
0715+1546
Rating
4E
Map
Component
A
B
C
D
BC
A
B
A
B
C
A
B
C
A
B
A
B
A
B
A
B
A
B
A
B
A
B
C
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
C
BC
A
B
A
B
2
Lambda Gem
0718+1632
4E
2
Hough 345
0723+2205
4E
1
STF 1081
0724+2128
4E
1
Barton 2374
0727+2218
4E
1
OSS 85
0729+2439
4E
1
A. G. 144
0752+2215
4E
3
Couteau 928
0753+2003
4E
3
STF 1167
0759+1628
4E
4
h408
0703+2322
5E
1
Hussey 454
0706+2142
5E
1
STF 1041 rej
0714+1746
5E
2
Pourteau 2595
0715+2345
5E
1
Ball 20
0716+2158
5E
1
Smart 72
0718+1523
5E
2
Pourteau 2816
0730+2303
5E
1
Pourteau 2835
0735+2450
5E
3
Soulie 422
0735+1724
5E
4
STF 1113 rej
0735+2416
5E
3
h428
0745+2051
5E
3
h3299
0746+1713
5E
4
- 45 -
Mag
8.07
9.66
11.40
11.40
3.58
10.70
9.57
10.45
13.40
7.30
8.61
9.20
10.29
11.20
7.61
9.02
8.28
10.58
9.27
9.70
9.70
11.50
9.77
12.26
9.44
11.80
11.00
9.30
11.70
10.55
10.73
7.02
10.44
9.56
11.47
9.10
12.89
9.44
11.70
9.00
10.40
8.10
10.10
10.70
8.24
13.01
10.81
11.31
Separation
—
23.8 +
42.0
PA
—
29 +
42.0
0.3 —
9.8 +
—
1.2 =
24.9 +
—
1.9 +
107.2
—
3.4 +
—
62.8 +
—
11.8 +
—
5.4 —
12.3 +
—
14.6 +
—
1.5 13.1 =
—
25.2
—
18.1 +
—
95 =
—
15.3 —
24.9 +
—
7.3 —
23.3
—
91.3
320 —
33 +
—
286 +
24.9 +
—
233 +
107.2
—
298 —
21 —
331 +
—
99 =
—
228 =
—
74 +
—
216 13.1 =
—
267
—
51 —
264 =
—
137 —
193 —
29 -!
—
268
—
179
8.1 —
14.3 +
—
19.5 =
46 =
—
279 —
240 +
Zone 137
Designation
Position
Rating
Map
STF 1158
0756+2153
5E
3
Delta Gem
0720+2159
2M
1
STF 1094
0727+1519
2M
2
A. G. 140
0726+2205
3M
1
OS 168 rej
0713+2121
4M
1
h416
0719+2243
4M
1
Hussey 707
0734+2138
4M
3
A. G. 142
0741+2312
4M
3
Hough 523
Jonckheere
728
0742+2138
4M
3
0706+1903
5M
2
Hough 346
0726+1809
5M
2
Couteau 475
0736+1950
5M
4
South 548
0728+2209
3D
1
STF 1147
0751+2432
3D
3
OS 164 rej
0706+2452
4D
1
STF 1129
0742+1803
4D
4
52 Gem
0715+2453
5D
1
Engelmann 30
0715+2443
5D
1
h2372
0720+2028
5D
1
56 Gem
0722+2027
5D
1
OS 183 rej
0754+1602
5D
4
Component
A
B
C
D
E
A
B
A
B
A
B
A
B
C
A
B
A
B
A
B
A
B
C
A
B
A
B
A
B
A
B
C
A
B
A
B
A
B
C
D
A
B
A
B
C
D
A
B
A
B
BC
A
B
- 46 -
Mag
9.50
10.20
12.50
3.55
8.18
7.61
8.63
9.89
10.57
7.30
11.55
10.08
10.38
10.40
8.98
10.80
9.81
10.45
9.49
11.20
11.70
8.58
9.52
6.93
11.70
8.52
12.10
6.78
12.10
8.91
9.66
9.68
6.89
10.30
8.97
10.22
9.10
10.90
5.84
12.70
6.89
12.31
10.62
10.40
7.81
12.57
5.09
12.20
7.24
13.44
Separation
—
7.6 +
20.4 +
63.6 58.4
—
5.9 —
2.4 =
—
1.9 —
24.0 +
51.8 +
—
9.3 —
2.5 =
—
1.7 +
—
8.6 =
34.0
—
3.0 +
—
12.8 +
—
19.3 —
11.5 +
35.4 —
2.3 —
9.8 +
—
1.0 +
21.6 33.0
—
23.9 +
—
49.1 +
127.4 93.4
—
22.4
—
16.5 BC 8.2 +
—
16.0 -
PA
—
334 +
20.4 +
63.6 154
—
224 +
—
97 +
—
175 =
—
67 =
51.8 +
—
76 —
19 =
—
18 =
—
324 +
34.0
—
71 —
57 —
82 +
—
19 35.4 —
171 +
—
63 +
—
197 =
21.6 33.0
—
265 +
—
18 =
127.4 93.4
—
3
—
202 BC 246 +
—
26 +
Zone 137
Deep Sky Objects
Object
NGC 2392
NGC 2420
NGC 2341
NGC 2339
NGC 2365
NGC 2407
NGC 2481
NGC 2357
NGC 2370
Position
0729+2055
0739+2134
0709+2036
0708+1900
0723+2204
0732+1821
0757+2346
0718+2321
0725+2347
Rating
2E
2M
4M
5M
4D
4D
4D
5D
5D
Map
1
3
1
2
1
4
3
1
1
Type
Pn (3b)
Oc (I 1r)
Gal (Sab pec)
Gal (SAB(rs)bc)
Gal (SABa)
Gal (S0-:)
Gal (E?)
Gal (Sc)
Gal (SB?)
- 47 -
Specifications
Surface
Mag
Br
8.0
8.3
13.2
12.6
12.5
13.2
12.4
13.8
13.4
13.0
12.9
12.4
13.3
13.7
13.6
12.9
Population
100