Zone 257, Master Map
ρ
ξ
-24°00'
Normal View
Zone Master, Normal View, 10 deg FOV
ο1
τ
f
c
δ Wezen
σ
-28°00'
ω
-26°00'
ο
ε Adhara
Canis Major
g
d
-32°00'
-30°00'
η Aludra
κ
π
e
-38°00'
h
-36°00'
-34°00'
Colum
Puppis
ζ
08h 32m 08h 24m
08h 08m
07h 52m
07h 36m 07h 28m 07h 20m 07h 12m
06h 56m 06h 48m
06h 32m
Zone 257, Map 1
Normal Image
-25°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
τ
Tau CMa
Bos 2138
Hipparcos 1037
NGC 2354
-26°00'
VY CMa
Ruprecht 18
δ
Wezen
Delta CMa
ω
-28°00'
-27°00'
h2391
σ
h2393
Hipparcos 1042
Ruprecht 20
η
Epsilon CMaε
Eta CMa
Aludra
h2370
h3923
07h 30m
07h 25m
07h 20m
07h 15m
07h 10m
07h 05m
07h 00m
-29°00'
NGC 2325
Zone 257, Map 1
Mirror Image
τ
-25°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
NGC 2362
Tau CMa
Bos 2138
Hipparcos 1037
NGC 2354
-26°00'
VY CMa
Ruprecht 18
Wezen
ω
-28°00'
h2391
-27°00'
Delta CMaδ
σ
Hipparcos 1042
ε
Epsilon CMa
Adhara
Ruprecht 20
Eta CMaη
Aludra
h2370
h3923
07h 00m
07h 05m
07h 10m
07h 15m
07h 20m
07h 25m
07h 30m
-29°00'
NGC 2325
Zone 257, Map 2
Normal Image
Bos 1544
h3949
Brisbane 2
-31°00'
-30°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
h3940
Collinder 132
Cordoba 48
-32°00'
Dunlop 57
Dunlop 49
Collinder 140
Jessup 152
-34°00'
-33°00'
Canis Major
h3969
Cordoba 281
h3928
07h 30m
07h 25m
07h 20m
07h 15m
07h 10m
07h 05m
07h 00m
Zone 257, Map 2
Mirror Image
-30°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
Bos 1544
h3949
-31°00'
h3940
Brisbane 2
Collinder 132
Dunlop 49
Collinder 140
Jessup 152
-34°00'
Canis Major
-33°00'
Dunlop 57
-32°00'
Cordoba 48
h3969
Cordoba 281
h3928
07h 00m
07h 05m
07h 10m
07h 15m
07h 20m
07h 25m
07h 30m
Zone 257, Map 3
Normal Image
-35°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
h3919
h3905
h3965
h3957
-36°00'
Jessup 167
Bur 757
π
Collinder 135
-37°00'
Jacob 10
Pi Pup
-39°00'
-38°00'
h3966
07h 30m
07h 25m
07h 20m
07h 15m
07h 10m
07h 05m
07h 00m
Zone 257, Map 3
Mirror Image
-35°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
h3919
h3965
h3957
Bur 757
Jessup 167
-36°00'
h3905
Jacob 10
π
-37°00'
Collinder 135
Pi Pup
-39°00'
-38°00'
h3966
07h 00m
07h 05m
07h 10m
07h 15m
07h 20m
07h 25m
07h 30m
Zone 257, Map 4
Normal Image
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
Xi Pup
-25°00'
ξ
Cordoba 62
Ruprecht 32
Trumpler 9
ο
Herschel 2
Sh 2-311
-26°00'
South 561
Ruprecht 36
NGC 2467
-27°00'
Kappa Pup
h2411
Haffner 21
-28°00'
NGC 2453
Bos 744
NGC 2483
h4007
Bos 747
h3982
Bos 2631
h2393
-29°00'
Ruprecht 44
3 Pup
h4024
Hipparcos 1119
NGC 2489
08h 00m
07h 55m
07h 50m
07h 45m
07h 40m
07h 35m
07h 30m
Zone 257, Map 4
Mirror Image
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
-25°00'
Xi Pupξ
Cordoba 62
Ruprecht 32
ο
Trumpler 9
Ruprecht 36
NGC 2467
-26°00'
South 561
Herschel 2
Sh 2-311
h2411
NGC 2453
Bos 744
NGC 2483
h2393
Bos 2631
h4007 Bos 747
h3982
-28°00'
-27°00'
Kappa Pup
-29°00'
Ruprecht 44
3 Pup
Hipparcos 1119
NGC 2489
07h 30m
07h 35m
07h 40m
07h 45m
07h 50m
07h 55m
08h 00m
Zone 257, Map 5
Normal Image
-30°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
-31°00'
NGC 2489
Cordoba 63
-32°00'
NGC 2439
-33°00'
h4009
-34°00'
Cordoba 54
Howe 65
08h 00m
07h 55m
07h 50m
07h 45m
07h 40m
07h 35m
07h 30m
Zone 257, Map 6
Mirror Image
Cordoba 63
-31°00'
NGC 2489
-30°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
NGC 2439
-32°00'
Dunlop 49
-33°00'
h4009
-34°00'
Cordoba 54
h3969
Howe 65
07h 30m
07h 35m
07h 40m
07h 45m
07h 50m
07h 55m
08h 00m
Zone 257, Map 6
Normal Image
-35°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
Jessup 167
-37°00'
La Plata 12
-36°00'
Jessup 177
-38°00'
Jessup 190
NGC 2451
-39°00'
NGC 2477
08h 00m
07h 55m
07h 50m
07h 45m
07h 40m
07h 35m
07h 30m
Zone 257, Map 6
Mirror Image
-35°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
-36°00'
Jessup 177
Jessup 167
-37°00'
La Plata 12
-38°00'
Jessup 190
NGC 2451
-39°00'
NGC 2477
ζ
07h 30m
07h 35m
07h 40m
07h 45m
07h 50m
07h 55m
08h 00m
Zone 257
1 Reference Star, 45 Double Stars,
18 Open Clusters, 1 Galaxy
Flamsteed
H
3 Pup .................................................... 23
h2370 ..................................................... 6
h2391 ..................................................... 4
h2393 ..................................................... 5
h2411 ................................................... 27
h3919 ................................................... 20
h3923 ..................................................... 5
h3928 ................................................... 16
h3940 ................................................... 12
h3949 ................................................... 11
h3957 ................................................... 20
h3965 ................................................... 21
h3966 ................................................... 18
h3969 ................................................... 13
h3982 ................................................... 24
h4007 ................................................... 25
h4009 ................................................... 34
Herschel 2 ............................................ 28
Hipparcos 1037 ...................................... 7
Hipparcos 1042 ...................................... 8
Hipparcos 1119 .................................... 28
Howe 65............................................... 34
B
Bos 1544 .............................................. 15
Bos 2138 ................................................ 7
Bos 2631 .............................................. 26
Bos 744 ................................................ 27
Bos 747 ................................................ 26
Brisbane 2 ............................................ 12
Bur 757 ................................................ 21
C
Collinder 132 ....................................... 17
Collinder 135 ....................................... 22
Collinder 140 ....................................... 17
Cordoba 281 ........................................ 15
Cordoba 48 .......................................... 13
Cordoba 54 .......................................... 33
Cordoba 62 .......................................... 25
Cordoba 63 .......................................... 33
D
Delta CMa.............................................. 6
Dunlop 49 ............................................ 11
Dunlop 57 ............................................ 14
J
Jacob 10 ............................................... 19
Jessup 152 ............................................ 14
Jessup 167 ............................................ 36
Jessup 177 ............................................ 36
Jessup 190 ............................................ 38
E
Eta CMa................................................. 3
-1-
Zone 257
K
P
Kappa Pup............................................ 23
Pi Pup................................................... 19
L
R
La Plata 12 ........................................... 37
Ruprecht 18.......................................... 10
Ruprecht 20............................................ 9
Ruprecht 32.......................................... 31
Ruprecht 36.......................................... 32
Ruprecht 44.......................................... 32
N
NGC 2325.............................................. 9
NGC 2354.............................................. 8
NGC 2439............................................ 35
NGC 2451............................................ 39
NGC 2453............................................ 29
NGC 2467............................................ 30
NGC 2477............................................ 38
NGC 2483............................................ 29
NGC 2489............................................ 31
S
Sharpless 2-311.................................... 32
South 561 ............................................. 24
V
VY CMa............................................... 10
-2-
Zone 257
Zone 257, Map 1
Double Stars
Easy
Eta CMa
Rating: 2 E
31 CMa; Aludra, "a virgin"; Smythe 2; Bpm 88; HD 58350; SAO 173651
Position: 0724-2918
A
B
Magnitude
2.45
7.71
Separation PA
—
—
188.5 +
340 +
Year
—
1988
Spectra
B5 II
A0 V
Colors
bW!
W
Notes:
1879: 185.0 @ 339. 4 measurements.
A shell of star stuff surrounds Aludra, whose diameter has been measured by
intereferometer to be 0.00074". It is also an infra-red source.
It may optical. The stars have a small difference in proper motion.
From James Kaler's Star Notes:
Its distance presents a problem. Direct measurements of parallax by the Hipparcos
satellite gives 3200 light years, but with a very high potential error. Some of "The
Virgins", however, are more than just a chance alignment; they form a loose, but real
group, an "association" called Collinder 121 that includes Wezen, Aludra, Omicron-1 and
2 and Sigma, and which has an average distance of 1,760 light years. With this distance,
Aludra shines with a total luminosity (accounting for ultraviolet radiation from its 13,500
Kelvin surface) of 66,000 Suns, a third again as great as Wezen's luminosity.
Temperature and luminosity conspire to give a radius 47 times that of the Sun, in good
agreement with the 43 solar radii gotten from the angular diameter. Temperature and
luminosity also tell of a star of about 15 solar masses that is well along in its evolution.
Born only 12 million years ago, it has given up the fusion of hydrogen in its core and is
most likely making a very rapid transition to becoming a red supergiant (though it is
possible it may have already been one and has now returned to the blue supergiant
realm), after which it will most likely explode as a supernova.
As a dying, expanding star, Aludra has a strong wind blowing from its surface at a
speed of some 500 kilometers per second. Now losing mass at a rate of roughly a
millionth of a solar mass a year (10 million times the rate of the solar wind), it has
already lost about a third the mass of the whole Sun. The cloud it has generated around
itself has been detected in the infrared part of the spectrum via satellite. Aludra has a
-3-
Zone 257
seventh magnitude white "companion" about two minutes of arc away that is easily
visible in a small telescope. The companionship, however, is not real, but just line of
sight, as the smaller star's class (it is an A dwarf like Sirius) places it at a distance of only
600 light years, much closer than Aludra.
Observations:
C8 at 104x. Wide, but pretty. Faint but rich field.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 12 feet; B = 9.0 inches.
Separation: AB = 941 miles.
Distance (LY): 3,200
Total luminosity (Suns): 84,600
h2391
Rating: 3 E
HD 59235; SAO 173797
Position: 0728-2650
A
B
Magnitude
6.26
10.28
Separation PA
—
—
16.7 +
290 -
Year
—
1933
Notes:
1831: 15.0 @ 292. 3 measurements.
Observations:
C8 at 65x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 54.3 inches.
Separation: AB = 17.2 miles.
Distance (LY): 660
Total luminosity (Suns): 103
-4-
Spectra
K5 III
Colors
R!
?
Zone 257
h2393
Rating: 3 E
SAO 173881
Position: 0730-2816
A
B
Magnitude
9.15
11.00
Separation PA
—
—
15.8 +
119 -
Year
—
1966
Spectra
K0
Colors
O
?
Notes:
1831: 9.0 @ 125. 3 measurements.
The Tycho-2 Catalogue indicates a single star entry.
Observations:
C8 at 104x. It shares the field with a few bright stars— 8.4m, 8.3m, 7.8m.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 26.0 inches.
Separation: AB = 9.81 miles.
Distance (LY): 398
Total luminosity (Suns): 3.49
h3923
Rating: 4 E
HD 53675; SAO 172908
Position: 0705-2942
A
B
C
Magnitude
9.36
11.50
9.50
Separation
—
11.4 50.8 +
PA
—
202 +
33 -
Notes:
AB 1835: 12.0 @ 198. 4 measurements.
AC 1913: 43.1 @ 35. 6 measurements.
Observations:
C8 at 104x.
-5-
Year
—
1920
1986
Spectra
G8 IV
Colors
W
No
W
Zone 257
h2370
Rating: 4 E
HD 56504; SAO 173330
Position: 0716-2930
A
B
Magnitude
9.09
9.90
Separation PA
—
—
21.2 +
53 -
Year
—
1918
Spectra
B9 IV
G5
Colors
bW
W
Notes:
1831: 20.0 @ 54. 5 measurements.
The stars have a small difference in proper motion.
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 12.0 inches; B = 21.6 inches.
Separation: AB = 3.73 miles.
Distance (LY): 113
Total luminosity (Suns): 0.3
Delta CMa
Wezen, 25 CMa; Bur 1412; HD 54605; SAO 173047
Rating: 5 E
Position: 0708-2624
A
B
Magnitude
1.83
8.68
Separation PA
—
—
265.1 +!! 225 +
Notes:
1832: 165.0 @ 224. 2 measurements.
Observations:
C11 at 98x.
-6-
Year
—
1985
Spectra
F8 Iab:
Colors
W
W
Zone 257
Hipparcos 1037
Rousseau 7 (C); SAO 173594
Rating: 5 E
Position: 0723-2532
A
B
C
Magnitude
9.18
11.53
9.26
Separation
—
0.3
38.5 +
PA
—
183
340 =
Year
—
1991
1991
Spectra
B
Colors
W
No
W
Notes:
AB 1 measurement. May be optical because Hipparcos gives different distances
(1,420 and 703 light years).
AC 1910: 38.3 @ 340. 7 measurements. 7 measurements.
Observations:
C11 at 98x.
Moderate
Bos 2138
Rating: 3 M
HD 56067; SAO 173276
Position: 0714-2518
A
B
Magnitude
7.32
11.00
Separation PA
—
—
8.0
225
Year
—
Notes:
1 measurement.
Observations:
C8 at 206x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 9.60 inches.
Separation: AB = 9.48 miles.
Distance (LY): 760
Total luminosity (Suns): 52
-7-
Spectra
B9 V
Colors
bW
?
Zone 257
Hipparcos 1042
Rating: 5 M
HD 58630; SAO 173692
Position: 0725-2811
A
B
Magnitude
7.93
10.37
Separation PA
—
—
11.2 226 -
Year
—
1991
Spectra
B5 V
Colors
W
?
Notes:
1912: 11.9 @ 227. 2 measurements.
Observations:
C11 at 98x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 11.4 inches.
Separation: AB = 31.5 miles.
Distance (LY): 1,800
Total luminosity (Suns): 193
Deep Sky Objects
Easy
NGC 2354
Other Names: Collinder 131, H VII 16
Astronomical League Program: Herschel 400 Club
Rating: 3 E
Position: 0714-2544
Type: Oc
Dimensions: 20'
Class: III 2r
Cluster population: 100
Magnitude: 6.5
Notes:
It is 35 light years in diameter and 180 million years old. The brightest star is 9.1m
(690 times brighter than the Sun).
This cluster lies 31,100 light years from the galactic center and 700 light years below
the galactic plane.
-8-
Zone 257
Observations:
C8 at 83x. Spread out, it is easy and oblate, with 40 stars easily visible. There is a
good double at the center too, and a very red star as well. 15 min E is a "Z" shaped
asterism.
Steve Coe's C11 at 90x in Sentinel, Arizona. 20 min diameter, irregular shape which
I whimsically called a "spleen", and it stuck that night with the group; several then
reported seeing the "Spleen Cluster".
Model (where the Sun is a baseball):
Its diameter would be 11,610 miles with stars 1,250 miles apart.
Distance (LY): 6,200
Luminosity (suns): 7,500
Moderate
NGC 2325
Other Names: PGC 20047
Rating: 3 M
Position: 0703-2842
Type: Gal
Dimensions: 3.3' x 1.9'
Class: E4
PA: 6
Magnitude: 11.20
Observations:
Steve Coe's C11 at 140x in Sentinel, Arizona. Elongated about 2 to 1; bright star at
one end; suddenly brighter middle.
Distance (LY): 80,000,000
Total luminosity (Suns): 16,600,000,000
Ruprecht 20
Position: 0727-2853
Type: Oc
Dimensions: 10'
Rating: 4 M
Class: III 2m
Cluster population: 30
Notes:
An asterism? If not, it could be 316 million years old.
The brightest star is 11.6m.
-9-
Magnitude: 9.5
Zone 257
Observations:
C8 at 104x. It has a brighter central star surrounded by a fan-shaped arc of stars.
Distance (LY): 3,940
Total luminosity (Suns): 192
VY CMa
Position: 0723-2548
Type: GN
Rating: 5 M
Class: R
Dimensions: 12" x 18"
Notes:
Van den Bos classed this as a multiple star, but the "companions" are actually bright
knots within the nebula the enshrouds the entire complex.
Observations:
C11 at 339x. A bright nebula that enshrouds the rO variable VY CMa. At first, I
could not focus VY, then noticed the nebula at higher powers.
Difficult
Ruprecht 18
Position: 0725-2613
Type: Oc
Dimensions: 4'
Rating: 3 D
Class: III 2p
Cluster population: 40
Magnitude: 9.4
Notes:
The brightest star is 11m.
The cluster is 44 million years old.
Observations:
C8 at 83x. Faint, it needs averted vision to see well. Note the semicircular shape, and
the bright star at the center.
- 10 -
Zone 257
Zone 257, Map 2
Double Stars
Easy
h3949
Rating: 2 E
HD 57120; SAO 197827
Position: 0719-3048
A
B
Magnitude
7.01
8.00
Separation PA
—
—
3.0 +
77 -
Year
—
1991
Spectra
B3 V
Colors
W
yW
Notes:
1835: 2.0 @ 80. 23 measurements.
Observations:
C8 at 280x. Duplicity was seen at 104x, but it took 270 to get a clean split.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 12.6 inches.
Separation: AB = 6.08 miles.
Distance (LY): 1,300
Total luminosity (Suns): 285
Dunlop 49
Rating: 2 E
HD 59499; SAO 198038
Position: 0729-3151
A
B
Magnitude
5.95
7.19
Separation PA
—
—
8.9 -! 54 +
Notes:
1835: 15.0 @ 50. 26 measurements.
- 11 -
Year
—
1993
Spectra
B3 V
B4 V
Colors
pY
B
Zone 257
Observations:
C8 at 65x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 12.6 inches; B = 12.0 inches.
Separation: AB = 8.05 miles.
Distance (LY): 580
Total luminosity (Suns): 145
h3940
Rating: 3 E
HD 55817; SAO 197706
Position: 0713-3058
A
B
Magnitude
6.80
9.90
Separation PA
—
—
6.7 97 +
Year
—
1991
Spectra
B9 V
Colors
W
rO
Notes:
1865: 12.0 @ 95. 9 measurements.
Observations:
C8 at 206x. Duplicity was noted at 104x, but 200x was needed to get a nice split.
The field offers some nice touches. h3940 lies between two bright stars. Just south of
h3940 is a triangle of 9m stars.
Brisbane 2
Rating: 3 E
HD 56731; SAO 197789
Position: 0717-3054
A
B
Magnitude
6.30
7.99
Separation PA
—
—
37.8 +
183 +
Year
—
1991
Spectra
A9 II
A5
Notes:
1838: 37.5 @ 181. 11 measurements.
This star is probably a foreground object in front of Collinder 132.
The stars share common proper motion.
- 12 -
Colors
W
W
Zone 257
Observations:
C8 at 83x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 6.30 inches; B = 8.13 inches.
Separation: AB = 28.4 miles.
Distance (LY): 481
Total luminosity (Suns): 67
h3969
Rating: 3 E
HD 59099; SAO 198003
Position: 0727-3419
A
B
Magnitude
7.03
8.17
Separation PA
—
—
17.6 227 +
Year
—
1991
Spectra
F8 V
G5 V
Colors
yW
B
Notes:
1835: 20.0 @ 225. 17 measurements.
The stars share a large common proper motion.
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 3.60 inches; B = 19.6 inches.
Separation: AB = 3.54 miles.
Distance (LY): 129
Total luminosity (Suns): 2.8
Cordoba 48
Rating: 4 E
HD 56162; SAO 197736
Position: 0715-3130
A
B
Magnitude
7.06
9.92
Separation PA
—
—
7.8 +
9+
- 13 -
Year
—
1991
Spectra
B9 V
Colors
W
B
Zone 257
Notes:
AB 1898: 7.3 @ 8. 10 measurements.
Observations:
C8 at 83x. Moderate field.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 9.60 inches.
Separation: AB = 6.93 miles.
Distance (LY): 570
Total luminosity (Suns): 60
Jessup 152
Position: 0721-3217
A
B
Magnitude
9.18
10.70
Rating: 4 E
Separation PA
—
—
7.0 +
219 -
Year
—
1993
Spectra
F8 V
Colors
W
yO
Notes:
1929: 6.3 @ 244. 3 measurements.
Observations:
C8 at 104x. It lies in the open cluster Collinder 140.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 3.60 inches.
Separation: AB = 5.46 miles.
Distance (LY): 500
Total luminosity (Suns): 5
Dunlop 57
Dawes 129; Bos 1540; HD 58535; SAO 197964
Rating: 4 E
Position: 0725-3149
A
B
Magnitude
5.35
7.58
Separation PA
—
—
99.2
342
- 14 -
Year
—
1922
Spectra
G8 II
Colors
Y
B
Zone 257
Notes:
1 measurement.
The primary has a mass of about 9 Suns. It is also an infra-red source.
Observations:
C8 at 83x. It lies in the open cluster Collinder 140, a very rich field.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 16 feet.
Separation: AB = 85.1 miles.
Distance (LY): 550
Total luminosity (Suns): 192
Bos 1544
Rating: 4 E
HD 59051; SAO 198002
Position: 0727-3046
A
B
C
Magnitude
8.69
10.92
10.13
Separation
—
6.4 120.0
PA
—
205 135
Year
—
1991
1929
Spectra
A0 V
Colors
W
?
pB
Notes:
AB 1913: 6.9 @ 212. 4 measurements.
AC 1 measurement.
Observations:
C8 at 104x.
Cordoba 281
Rossiter 5257; HD 54414; SAO 197595
Rating: 5 E
Position: 0707-3427
A
B
Magnitude
8.83
10.86
Separation PA
—
—
12.8 342 -
- 15 -
Year
—
1991
Spectra
G0 V
Colors
bW
?
Zone 257
Notes:
AB 1912: 13.3 @ 343. 4 measurements.
May be optical.
There are also two 14.0m companions very close to A and B.
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 3.45 inches.
Separation: AB = 4.79 miles.
Distance (LY): 240
Total luminosity (Suns): 1.9
Moderate
h3928
Rating: 4 M
HD 53952; SAO 197557
Position: 0706-3447
A
B
C
D
E
Magnitude
6.15
7.60
9.59
10.96
13.50
Separation
—
2.7 37.5 +
38.7 +
18.0 -
PA
—
148 290 +
125 +
301 +
Year
—
1994
1985
1920
1920
Spectra
F0 V
Colors
W
B
W
?
No
Notes:
AB 1836: 4.0 @ 157. 32 measurements.
AC 1836: 37 @ 287. 10 measurements.
AD 1879: 35.5 @ 119. 2 measurements.
AE 1851: 19.1 @ 285. 2 measurements.
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 5.7 inches.
Separation: AB = 4,013 feet; AC = 10.7 miles; AD = 11.0 miles; AE = 5.11 miles.
- 16 -
Zone 257
Distance (LY): 182
Total luminosity (Suns): 11.4
Deep Sky Objects
Easy
Collinder 140
Other Names: The Tuft in the Tail of the Dog
Rating: 3 E
Position: 0724-3212
Type: Oc
Dimensions: 42'
Class: III 3p
Cluster population: 30
Magnitude: 3.5
Notes:
It is 14 light years in diameter and 35 million years old. The brightest star is 5.4m
(540 times brighter than the Sun).
Observations:
C8 at 83x. A very large and bright group, it looks best in the spotter. It is somewhat
sparse, and the center looks even more rarefied.
Model (where the Sun is a baseball):
Its diameter would be 4,510 miles with stars 725 miles apart.
Distance (LY): 1,320
Luminosity (suns): 5,400
Collinder 132
Position: 0714-3110
Type: Oc
Dimensions: 95'
Rating: 5 E
Class: III 3p
Cluster population: 25
Magnitude: 3.6
Notes:
The brightest star is 5.3m (1,900 times brighter than the Sun). The cluster is 50 light
years in diameter.
Observations:
C8 at 10x. It was very large and sparse (looking best in the spotter).
- 17 -
Zone 257
Actually, it is two clusters in the same line of sight, the nearer (at 1,100 light years)
being Collinder 132b, while the farther (at 1,800 light years) is Collinder 132a.
Model (where the Sun is a baseball):
The diameter would be 16,015 miles with stars 2,750 miles apart.
Distance (LY): 1,540
Luminosity (suns): 6,700
Zone 257, Map 3
Double Stars
Easy
h3966
Rating: 2 E
HD 58635; SAO 197974
Position: 0725-3717
A
B
Magnitude
6.14
7.10
Separation PA
—
—
6.9 323 +
Year
—
1991
Notes:
1835: 7.0 @ 321. 27 measurements.
The stars have different proper motions.
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 5.70 inches; B = 9.83 inches.
Separation: AB = 7.42 miles.
Distance (LY): 690
Total luminosity (Suns): 189
- 18 -
Spectra
F0 V
F0 V
Colors
W
W
Zone 257
Pi Pup
16 Pup; Dunlop 43; HD 56855; SAO 197795
Rating: 3 E
Position: 0717-3706
A
B
Magnitude
2.71
7.84
Separation PA
—
—
68.9 213 -
Year
—
1985
Spectra
K5 Ib
Colors
rO
B
Notes:
1826: 72.6 @ 214. 21 measurements.
This star is a member of the Sco-Cen Association.
The stars share common proper motion.
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 1.80 inches.
Separation: AB = 118 miles.
Distance (LY): 1,100
Total luminosity (Suns): 8,173
Jacob 10
NV Pup; HD 57150; SAO 197824
Rating: 3 E
Position: 0718-3645
A
B
C
D
BC
CD
Magnitude
4.65
5.11
8.10
8.64
Separation PA
—
—
240.0 +
98 +
116.7 3.0 =
216 +
212 =
Notes:
AB 1846: 238.7 @ 97. 5 measurements.
BC 1846: 116.9 @ 215. 4 measurements.
CD 1846: 3.0 @ 212. 13 measurements.
- 19 -
Year
—
1991
1991
1991
Spectra
B3 Ve
B3 II
Colors
W
W
B
B
Zone 257
The primary is spinning very rapidly— 277 km/sec. It has thus thrown off a shell of
material.
Observations:
C8 at 104x. It forms a neat right triangle in the W end of the open cluster Collinder
135.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 12.6 inches; B = 13.2 inches.
Separation: AB = 318 miles; BC = 155 miles; CD = 3.98 miles.
Distance (LY): 850
Total luminosity (Suns): 1,310
h3957
Rating: 3 E
HD 58038; SAO 197906
Position: 0722-3555
A
B
Magnitude
6.68
8.80
Separation PA
—
—
7.5 192 -
Year
—
1991
Spectra
F8
Colors
gW
O
Notes:
1836: 15.0 @ 195. 22 measurements.
The stars have different proper motions.
Observations:
C8 at 104x. Odd colors!
h3919
Rating: 5 E
HD 53404
Position: 0703-3519
A
B
Magnitude
8.80
9.48
Separation PA
—
—
8.7 260 +
Notes:
1836: 15.0 @ 257. 8 measurements.
- 20 -
Year
—
1991
Spectra
K0
Colors
O
rO
Zone 257
May be optical because Hipparcos gives different distances (850 and 433 light years).
Observations:
C8 at 206x.
Moderate
Bur 757
Rating: 5 M
HD 55718; SAO 197694
Position: 0712-3633
A
B
Magnitude
5.94
8.32
Separation PA
—
—
2.6 +
68 +
Year
—
1991
Spectra
B5 V
Colors
W
B?
Notes:
AB 1879: 1.5 @ 60. 15 measurements.
Star B may be a variable.
Observations:
C8 at 280x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 11.4 inches.
Separation: AB = 3.65 miles.
Distance (LY): 900
Total luminosity (Suns): 285
h3965
Rating: 5 M
HD 58420; SAO 197951
Position: 0724-3550
A
B
Magnitude
6.32
12.50
Separation PA
—
—
24.5 307 =
Notes:
1835: 25.0 @ 307. 4 measurements.
- 21 -
Year
—
1933
Spectra
B8 V
Colors
bW
?
Zone 257
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 10.2 inches.
Separation: AB = 26.8 miles.
Distance (LY): 700
Total luminosity (Suns): 120.38
Deep Sky Objects
Easy
Collinder 135
Position: 0717-3650
Type: Oc
Dimensions: 50'
Rating: 5 E
Class: IV 2p
Magnitude: 2.1
Notes:
The cluster is 25 million years old.
Observations:
C8 at 104x. It lies just N of 5m Pi Pup. It is a very poor group, not at all rich. I
counted seven stars in bad seeing, plus Pi, in a 30 min field.
Distance (LY): 1,030
Total luminosity (Suns): 12,000
- 22 -
Zone 257
Zone 257, Map 4
Reference Star
3 Pup (HD 62623; SAO 174400)
Position: 0744-2857
Mag : 3.54
Spectrum : A2 Iae
Color : W
Notes:
This star is a spectroscopic binary with a period of 137.767 days and is an infra-red
source.
Double Stars
Easy
Kappa Pup
Markeb; ADS 6255; HD 61555; SAO 174198; H III 27
Astronomical League Program: Double Star Club
Rating: 1 E
Position: 0739-2648
A
B
Magnitude
4.69
4.70
Separation PA
—
—
10
318
Year
—
1951
Spectra
B5 V
B8 V
Colors
W
W
Observations:
C8 at 104x. It lies in the NE quadrant of the open cluster NGC 2422. Sharp!
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 11.4 inches; B = 10.2 inches.
Separation: AB = 7.08 miles.
Distance (LY): 454
Total luminosity (Suns): 425
- 23 -
Zone 257
h3982
P Pup; ADS 6205; HD 60863; SAO 174058
Rating: 3 E
Position: 0735-2822
A
B
C
BC
Magnitude
4.65
9.13
10.44
Separation PA
—
—
38.2 +
151 =
41.9 -
130 -
Year
—
1981
Spectra
B8 V
Colors
W
B
?
1933
Notes:
AB 1896: 37 @ 151. 5 measurements.
BC 1896: 42.8 @ 133. 3 measurements.
The primary rotates at a giddy 222 km/sec.
Observations:
C8 at 65x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 10.2 inches.
Separation: AB = 13.4 miles; BC = 14.7 miles.
Distance (LY): 225
Total luminosity (Suns): 54.2
South 561
Rating: 4 E
HD 63524
Position: 0748-2546
A
B
C
BC
Magnitude
8.80
9.70
9.80
Separation PA
—
—
51.2 +
3+
10.2
216
Year
—
1933
Spectra
A
Colors
W
bW
No
1912
Notes:
AB 1825: 50.9 @ 2. 8 measurements. Hipparcos/Tycho data show different
distances for these stars; they may be optical.
BC 1825: 5.0 @ 235. 5 measurements.
- 24 -
Zone 257
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 7.94 inches.
Separation: AB = 27.7 miles; BC = 5.52 miles.
Distance (LY): 347
Total luminosity (Suns): 4
h4007
Position: 0750-2815
A
B
Magnitude
9.36
10.02
Rating: 4 E
Separation PA
—
—
17.0 +
272 -
Year
—
1933
Spectra
A0 III/IV
Colors
W
bW
Notes:
1835: 15.0 @ 273. 7 measurements.
Observations:
C11 at 98x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 19.2 inches.
Separation: AB = 3.02 miles.
Distance (LY): 114
Total luminosity (Suns): 0.28
Cordoba 62
Rating: 4 E
ADS 6437; HD 64454; SAO 174732
Position: 0753-2514
A
B
Magnitude
8.59
10.90
Separation PA
—
—
5.9 +
7+
Notes:
AB 1911: 5.4 @ 0. 5 measurements.
- 25 -
Year
—
1994
Spectra
K2 IV
Colors
O
W
Zone 257
Observations:
C8 at 206x. It lies a little S of the center of a line between two 9m stars 20 min apart
in pa 160.
Moderate
Bos 747
Rating: 4 M
HD 64284; SAO 174696
Position: 0752-2818
A
B
Magnitude
9.96
10.03
Separation PA
—
—
2.4 +
263 +!
Year
—
1991
Spectra
F6 V
Colors
W
W
Notes:
1927: 2.3 @ 79. 4 measurements. Quadrant reversal?
Observations:
C11 at 339x.
Bos 2631
Rating: 5 M
HD 60369; SAO 173983
Position: 0733-2820
A
B
Magnitude
8.14
12.32
Separation PA
—
—
9.8 =
177 =
Year
—
1991
Notes:
1940: 9.8 @ 177. 3 measurements.
Observations:
C11 at 98x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 24 inches.
Separation: AB = 100 miles.
- 26 -
Spectra
O9 III
Colors
B
W
Zone 257
Distance (LY): 6,570
Total luminosity (Suns): 1,980
h2411
Rating: 5 M
HD 62084; SAO 174295
Position: 0741-2700
A
B
Magnitude
9.19
10.95
Separation PA
—
—
14.7 +
199 -
Year
—
1991
Spectra
A2 III/IV
Colors
W
W
Notes:
1831: 10.0 @ 200. 4 measurements.
May be optical because Hipparcos gives different distances (184 and 27 light years).
Observations:
C11 at 98x.
Bos 744
Rating: 5 M
HD 63624; SAO 174590
Position: 0749-2725
A
B
Magnitude
9.03
10.89
Separation PA
—
—
4.7 =
204 =
Year
—
1991
Notes:
1927: 4.7 @ 204. 7 measurements.
Observations:
C8 at 104x. Many 9m-10m stars are in the field.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 9.00 inches.
Separation: AB = 7.77 miles.
Distance (LY): 1,060
Total luminosity (Suns): 27
- 27 -
Spectra
A0 V
Colors
W
W
Zone 257
Difficult
Hipparcos 1119
Rating: 5 D
HD 64361
Position: 0752-2938
A
B
Magnitude
9.79
11.87
Separation PA
—
—
15.8 29 =
Year
—
1991
Spectra
B9 V
Colors
B
?
Notes:
1913: 16.1 @ 29. 2 measurements.
Observations:
C11 at 98x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 9.60 inches.
Separation: AB = 39.0 miles.
Distance (LY): 1,580
Total luminosity (Suns): 27
Deep Sky Objects
Easy
Herschel 2
Other Names: Trumpler 9
Rating: 4 E
Position: 0755-2600
Type: Oc
Cluster population: 40
Magnitude: 9.0
Dimensions: 9'
Observations:
C8 at 104x. It lies just NE of the diffuse nebula NGC 2467 and resembles a sideways
S. It is somewhat clumpy.
- 28 -
Zone 257
Distance (LY): 7,200
Total luminosity (Suns): 1,000
NGC 2483
Position: 0756-2756
Type: Oc
Dimensions: 10'
Rating: 4 E
Class: III 2m
Cluster population: 30
Magnitude: 7.6
Notes:
It is 28 light years in diameter and 12 million years old. The brightest cluster star is
9.3m (1,350 times brighter than the Sun).
It lies 34,000 light years from the galactic center and 50 light years above the galactic
plane.
Probably not a cluster.
Observations:
C8 at 104x. Coarse, it resembles an arrowhead pointing NW, with a dominant 7m star
in the N edge. Most stars are fainter than 9m. A 6.5m Y star lies 10 min SW.
Model (where the Sun is a baseball):
Its diameter would be 8,900 miles with stars 1,450 miles apart.
Distance (LY): 5,410
Luminosity (suns): 2,090
Moderate
NGC 2453
Other Names: Collinder 162
Rating: 3 M
Position: 0748-2714
Type: Oc
Dimensions: 5'
Class: I 3m
Cluster population: 30
Magnitude: 8.3
Notes:
This cluster is 15 million years old. The brightest star is 9.5m (300 times brighter
than the Sun).
It lies 31,000 light years from the galactic center and 110 light years below the
galactic plane.
- 29 -
Zone 257
Observations:
C8 at 104x. Grainy at low powers, it is partly resolved at 200x (8 stars). There is a
9.3m star 5’ NW (SAO 174539). The planetary nebula NGC 2452 (12.6m, 19" diameter)
is in the SW quadrant.
Model (where the Sun is a baseball):
Its diameter would be 2,290 miles with stars 360 miles apart.
Distance (LY): 7,010
Luminosity (suns): 1,840
NGC 2467
Other Names: Collinder 164, H IV 22
Astronomical League Program: Herschel II Club
Rating: 3 M
Position: 0753-2623
Type: Oc
Dimensions: 15'
Class: I 3mn
Cluster population: 50
Magnitude: 7.1
Notes:
Two clusters are embedded— Haffner 18a and 18b. They are 250 million years old
and are part of the Pup OB1 association.
They lie 36,000 light years from the galactic center and 100 light years above the
galactic plane.
Observations:
C8 at 104x. It is round and even, but fades rapidly at the edge. The unresolved
splotch SW of the center is the open cluster Haffner 18.
Model (where the Sun is a baseball):
Its diameter would be 15,450 miles with stars 2,100 miles apart.
Distance (LY): 11,000
Luminosity (suns): 14,000
- 30 -
Zone 257
NGC 2489
Other Names: Melotte 79; Collinder 169; Raab 66, H VII 23
Astronomical League Program: Herschel 400 Club
Rating: 3 M
Position: 0756-3004
Type: Oc
Dimensions: 8'
Class: I 2m
Cluster population: 45
Magnitude: 7.9
Notes:
It is 184 million years old. The brightest star is 11m (50 times brighter than the Sun).
This cluster lies 29,000 light years from the galactic center and 50 light years below
the galactic plane.
Observations:
C8 at 206x. Delicate, tight and rich! 30 stars were resolved. The very red star PX
Pup is 12 min S of the cluster.
Model (where the Sun is a baseball):
Its diameter would be 2,920 miles with stars 410 miles apart.
Distance (LY): 12,900
Luminosity (suns): 3,270
Ruprecht 32
Position: 0745-2531
Type: Oc
Dimensions: 6'
Rating: 4 M
Class: III 2pn
Cluster population: 30
Magnitude: 8.4
Notes:
It is 23 light years in diameter and 12 million years old.
The brightest star is 9.6m (2,000 times brighter than the Sun).
Observations:
C8 at 104x. A rich oval was seen (with averted vision) 20 min E of a 6.6m star, SAO
174395. The cluster itself is a faint, loose scattering with a 7m foreground star at the S
tip.
Distance (LY): 17,400
Luminosity (suns): 10,300
- 31 -
Zone 257
Ruprecht 36
Position: 0749-2618
Type: Oc
Dimensions: 4.0'
Rating: 4 M
Class: I 1 p
Cluster population: 30
Magnitude: 9.6
Notes:
This cluster is 40 million years old.
The brightest star is 10.3m.
Observations:
C8 at 206x. This cluster is dominated by a small, flat triangle. I counted 6 stars with
others suspected but not confirmed.
Distance (LY): 5,480
Total luminosity (Suns): 340
Difficult
Sharpless 2-311
Position: 0753-2623
Type: Gn
Rating: 3 D
Dimensions: 4'
Observations:
C8 at 104x. A prominent E-W lane lies just a little N of the center.
Ruprecht 44
Position: 0757-2835
Type: Oc
Dimensions: 5'
Rating: 4 D
Class: III 1p
Cluster population: 100
Magnitude: 11.5
Notes:
This cluster may be 9 million years old.
Observations:
C8 at 104x. Only 8 stars were resolved. It looked grainy at all powers. An acute
triangle lies just N.
Distance (LY): 15,400
Luminosity (suns): 470
- 32 -
Zone 257
Zone 257, Map 5
Double Stars
Easy
Cordoba 63
Position: 0756-3055
A
B
Magnitude
8.90
9.13
Rating: 2 E
Separation PA
—
—
8.0 309 -
Year
—
1969
Spectra
A0 V
Colors
W
pB
Notes:
AB 1913: 8.8 @ 312. 4 measurements.
Observations:
C8 at 104x. Faint but rich field.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 9.00 inches.
Separation: AB = 2.53 miles.
Distance (LY): 203
Total luminosity (Suns): 1.6
Cordoba 54
Rossiter 2502; SAO 198370
Rating: 4 E
Position: 0745-3314
A
B
Magnitude
8.97
9.35
Separation PA
—
—
5.1 +
122 +
Notes:
AB 1910: 4.8 @ 121. 9 measurements.
Observations:
C8 at 104x.
- 33 -
Year
—
1991
Spectra
B9 V
Colors
bW
W
Zone 257
h4009
Bos 2157 (D); SAO 198501
Rating: 4 E
Position: 0750-3210
A
B
C
Magnitude
8.90
9.30
11.26
Separation
—
10.1 +
30.0
PA
—
326 +
180
Year
—
1992
1835
Spectra
F5
Colors
W
W?
?
Notes:
AB 1835: 10.0 @ 310. 20 measurements. The stars have different proper motions.
AC 1 measurement.
Observations:
C8 at 206x. It lies just N of a shallow 9m triangle that runs E-W.
Moderate
Howe 65
Rating: 3 M
HD 64379; SAO 198540
Position: 0752-3442
A
B
Magnitude
5.01
8.32
Separation PA
—
—
3.6 +
270 -
Year
—
1994
Notes:
1876: 3.0 @ 300. 27 measurements.
This system may be a member of the Hyades Group.
Observations:
C8 at 280x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 4.80 inches.
Separation: AB = 1,742 feet.
Distance (LY): 59
Total luminosity (Suns): 2.89
- 34 -
Spectra
F3 V
Colors
W
O
Zone 257
Deep Sky Objects
Easy
NGC 2439
Other Names: Melotte 74; Collinder 158
Rating: 2 E
Position: 0741-3139
Type: Oc
Dimensions: 10'
Class: II 3r
Cluster population: 80
Magnitude: 6.9
Notes:
It is 18 million years old. The earliest stars
are B2 and B1 types. Five Be stars are known
to be part of this group of 181+ stars.
Uneven absorption of light from its
members suggests that it may be an asterism.
It lies 34,000 light years from the galactic
center and 900 light years below the galactic
plane.
NGC 2439
Open cluster (II 3 r; 80 stars)
Observed with C8 on 2/1/92
Magnification: 80x
Observations:
C8 at 104x. Beautiful! A 7m Y star (the
variable R Pup) dominates the N end. This
group has many pairs too, and a prominent
triangular asterism. The center looks fairly
void. Of this, Steve Coe writes, "The center of
this cluster is dark and this bizarre absorption
from dark nebulae makes the cluster take on a
horseshoe or Arc de Triomphe shape."
Model (where the Sun is a baseball):
Its diameter would be 4,960 miles with stars 575 miles apart.
Distance (LY): 12,570
Luminosity (suns): 21,500
- 35 -
Zone 257
Zone 257, Map 6
Double Stars
Easy
Jessup 167
PS Pup; HD 60168; SAO 198093
Rating: 4 E
Position: 0732-3553
A
B
Magnitude
6.61
11.68
Separation PA
—
—
91.5
345
Year
—
1929
Spectra
A0 V
Colors
W
pO
Notes:
1 measurement.
Star A is a spectroscopic binary and an ellipsoidal variable.
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 9.00 inches.
Separation: AB = 126 miles.
Distance (LY): 880
Total luminosity (Suns): 142
Moderate
Jessup 177
Rating: 4 M
HD 61640; SAO 198238
Position: 0739-3548
A
B
Magnitude
8.17
11.80
Separation PA
—
—
8.6 148 +
- 36 -
Year
—
1991
Spectra
G8 III
Colors
O
?
Zone 257
Notes:
1913: 9.1 @ 145. 6 measurements.
Observations:
C8 at 206x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 43.5 inches.
Separation: AB = 16.9 miles.
Distance (LY): 1,260
Total luminosity (Suns): 102
La Plata 12
Rating: 4 M
HD 65162; SAO 198605
Position: 0756-3555
A
B
C
Magnitude
8.14
12.30
10.19
Separation
—
5.2 +
15.3 -
PA
—
215 +
150 =
Year
—
1929
1956
Spectra
B8 V
Notes:
AB 1919: 5.0 @ 211. 2 measurements.
AC 1913: 15.5 @ 150. 7 measurements.
The stars share a small common proper motion.
Observations:
C8 at 280x. Star B is extremely difficult.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 10.2 inches.
Separation: AB = 132 miles; AC = 389 miles.
Distance (LY): 16,300
Total luminosity (Suns): 14,000
- 37 -
Colors
W
?
O
Zone 257
Difficult
Jessup 190
Rating: 4 D
SAO 198458
Position: 0748-3741
A
B
Magnitude
8.71
9.35
Separation PA
—
—
2.2 207 +
Year
—
1991
Spectra
A0 V
Colors
Y
O
Notes:
1929: 2.3 @ 206. 3 measurements.
Observations:
C8 at 104x. Bright and rich field.
Deep Sky Objects
Easy
NGC 2477
Other Names: OCL 720
Astronomical League Program: Caldwell Club
Position: 0752-3833
Type: OC
Dimensions: 27'
Class: I 2 r :b
Cluster population: 300
Rating: 2 E
Magnitude: 5.8
Notes:
This cluster may be 705 million years old.
Observations:
C8 at 104x. Marvelous object! Fills the field with stunning glitter and scintillating
points of light (due, in part, to the low latitude). The stars are fairly even in brightness
and very densely packed, similar to M36 in Auriga. Roughly semi-circular in shape, the
north half being much brighter and richer.
Distance (LY): 4,200
Total luminosity (Suns): 6,600
- 38 -
Zone 257
NGC 2451
Other Names: Collinder 161
Rating: 4 E
Position: 0745-3758
Type: Oc
Dimensions: 45.0'
Class: II 2p
Cluster population: 40
Magnitude: 2.8
Notes:
This cluster is probably about 60 million years old.
Observations:
C8 at 104x. It is large, bright, and very scattered. It is badly absorbed at the low
viewing latitude I have. It is dominated by a lopsided diamond that includes the brightest
star (a rO one of 3.6m).
Distance (LY): 620
Total luminosity (Suns): 2,280
- 39 -
Zone 257
Zone 257 Mini-Catalog
Double Stars
Designation
Position
Rating
Map
Kappa Pup
0739-2648
1E
4
h3949
0719-3048
2E
2
Eta CMa
0724-2918
2E
1
h3966
0725-3717
2E
3
Dunlop 49
0729-3151
2E
2
Cordoba 63
0756-3055
2E
5
h3940
0713-3058
3E
2
Brisbane 2
0717-3054
3E
2
Pi Pup
0717-3706
3E
3
Jacob 10
0718-3645
3E
3
h3957
0722-3555
3E
3
h3969
0727-3419
3E
2
h2391
0728-2650
3E
1
h2393
0730-2816
3E
1
h3982
0735-2822
3E
4
h3923
0705-2942
4E
1
Cordoba 48
0715-3130
4E
2
h2370
0716-2930
4E
1
Jessup 152
0721-3217
4E
2
Dunlop 57
0725-3149
4E
2
Component
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
C
D
BC
CD
A
B
A
B
A
B
A
B
A
B
C
BC
A
B
C
A
B
A
B
A
B
A
B
- 40 -
Mag
4.69
4.70
7.01
8.00
2.45
7.71
6.14
7.10
5.95
7.19
8.90
9.13
6.80
9.90
6.30
7.99
2.71
7.84
4.65
5.11
8.10
8.64
6.68
8.80
7.03
8.17
6.26
10.28
9.15
11.00
4.65
9.13
10.44
9.36
11.50
9.50
7.06
9.92
9.09
9.90
9.18
10.70
5.35
7.58
Separation
—
10
—
3.0 +
—
188.5 +
—
6.9 —
8.9 -!
—
8.0 —
6.7 —
37.8 +
—
68.9 —
240.0 +
PA
—
318
—
77 —
340 +
—
323 +
—
54 +
—
309 —
97 +
—
183 +
—
213 —
98 +
116.7 –
3.0 =
—
7.5 —
17.6 —
16.7 +
—
15.8 +
—
38.2 +
216 +
212 =
—
192 —
227 +
—
290 —
119 —
151 =
41.9 —
11.4 50.8 +
—
7.8 +
—
21.2 +
—
7.0 +
—
99.2
130 —
202 +
50.8 +
—
9+
—
53 —
219 —
342
Zone 257
Designation
Position
Rating
Map
Bos 1544
0727-3046
4E
2
Jessup 167
0732-3553
4E
6
Cordoba 54
0745-3314
4E
5
South 561
0748-2546
4E
4
h4009
0750-3210
4E
5
h4007
0750-2815
4E
4
Cordoba 62
0753-2514
4E
4
h3919
0703-3519
5E
3
Cordoba 281
0707-3427
5E
2
Delta CMa
0708-2624
5E
1
Hipparcos
1037
0723-2532
5E
1
Bos 2138
0714-2518
3M
1
Howe 65
0752-3442
3M
5
h3928
0706-3447
4M
2
Jessup 177
0739-3548
4M
6
Bos 747
0752-2818
4M
4
La Plata 12
0756-3555
4M
6
Bur 757
0712-3633
5M
3
h3965
Hipparcos
1042
0724-3550
5M
3
0725-2811
5M
1
Bos 2631
0733-2820
5M
4
h2411
0741-2700
5M
4
Component
A
B
C
A
B
A
B
A
B
C
BC
A
B
C
A
B
A
B
A
B
A
B
A
B
A
B
C
A
B
A
B
A
B
C
D
E
A
B
A
B
A
B
C
A
B
A
B
A
B
A
B
A
B
- 41 -
Mag
8.69
10.92
10.13
6.61
11.68
8.97
9.35
8.80
9.70
9.80
8.90
9.30
11.26
9.36
10.02
8.59
10.90
8.80
9.48
8.83
10.86
1.83
8.68
9.18
11.53
9.26
7.32
11.00
5.01
8.32
6.15
7.60
9.59
10.96
13.50
8.17
11.80
9.96
10.03
8.14
12.30
10.19
5.94
8.32
6.32
12.5
7.93
10.37
8.14
12.32
9.19
10.95
Separation
—
6.4 120.0
—
91.5
—
5.1 +
—
51.2 +
PA
—
205 120.0
—
345
—
122 +
—
3+
10.2
—
10.1 +
30.0
—
17.0 +
—
5.9 +
—
8.7 —
12.8 —
265.1 +!!
—
0.3
38.5 +
—
8.0
—
3.6 +
—
2.7 37.5 +
38.7 +
18.0 —
8.6 —
2.4 +
—
5.2 +
15.3 —
2.6 +
—
24.5 —
11.2 —
9.8 =
—
14.7 +
216
—
326 +
30.0
—
272 —
7+
—
260 +
—
342 —
225 +
—
183
38.5 +
—
225
—
270 —
148 37.5 +
38.7 +
301 +
—
148 +
—
263 +!
—
215 +
15.3 —
68 +
—
307 =
—
226 —
177 =
—
199 -
Zone 257
Designation
Position
Rating
Component
Map
Bos 744
0749-2725
5M
4
Jessup 190
Hipparcos
1119
0748-3741
4D
6
0752-2938
5D
4
A
B
A
B
A
B
Mag
9.03
10.89
8.71
9.35
9.79
11.87
Separation
—
4.7 =
—
2.2 —
15.8 -
PA
—
204 =
—
207 +
—
29 =
Deep Space Objects
Object
NGC 2439
NGC 2477
NGC 2354
Collinder 140
NGC 2451
Herschel 2
NGC 2483
Collinder 132
Collinder 135
NGC 2325
NGC 2453
NGC 2467
NGC 2489
Ruprecht 20
Ruprecht 32
Ruprecht 36
VY CMa
Trumpler 9
Ruprecht 18
Sharpless 2-311
Ruprecht 44
Position
0741-3139
0752-3833
0714-2544
0724-3212
0745-3758
0755-2600
0756-2756
0714-3110
0717-3650
0703-2842
0748-2714
0753-2623
0756-3004
0727-2853
0745-2531
0749-2618
0723-2548
0755-2556
0725-2613
0753-2623
0757-2835
Rating
2E
2E
3E
3E
4E
4E
4E
5E
5E
3M
3M
3M
3M
4M
4M
4M
5M
5M
3D
3D
4D
Map
5
6
1
2
6
4
4
2
3
1
4
4
4
1
4
4
1
4
1
4
4
Type
Oc (II 3r)
Oc (I 2 r :b)
Oc (III 2r)
Oc (III 3p)
Oc (II 2p)
Oc
Oc (III 2m)
Oc (III 3p)
Oc (IV 2p)
Gal (E)
Oc (I 3m)
Oc (I 3mn)
Oc (I 2m)
Oc (III 2m)
Oc (III 2pn)
Oc (I 1 p)
Gn (R)
Oc (II 2p)
Oc (III 2p)
Gn
Oc (III 1p)
- 42 -
Specifications
Surface
Mag
Br
6.9
5.8
6.5
3.5
2.8
9.0
7.6
3.6
2.1
11.20
8.3
7.1
7.9
9.5
8.4
9.6
Population
80
300
100
30
40
40
30
25
30
50
45
30
30
30
9.0
9.4
20
40
11.5
100