Zone 261, Master Map
Corvus
-24°00'
Normal View
Zone Master, Normal View, 10 deg FOV
-30°00'
c
χ2
χ1
-28°00'
e
-26°00'
Crater
α Alchiba
Hydra
-32°00'
ξ
d
f
-34°00'
β
ο
ι
No Map
-38°00'
g
-36°00'
Antlia
Vela
12h 32m 12h 24m 12h 16m 12h 08m 12h 00m
11h 44m 11h 36m 11h 28m 11h 20m
11h 04m 10h 56m
10h 40m 10h 32m
Zone 261, Map 1
Normal Image
Stone 21
-26°00'
-25°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
-27°00'
NGC 3585
χ1
Howe 25
-29°00'
-28°00'
χ2
h4412
h4418
11h 30m
11h 25m
11h 20m
11h 15m
11h 10m
11h 05m
11h 00m
Zone 261, Map 1
Mirror Image
-26°00'
-25°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
Stone 21
χ1
-27°00'
NGC 3585
χ2
-29°00'
-28°00'
Howe 25
h4412
h4418
11h 00m
11h 05m
11h 10m
11h 15m
11h 20m
11h 25m
11h 30m
Zone 261, Map 2
Normal Image
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
-31°00'
h4430
-30°00'
h4418
h4428
-32°00'
h4439
-34°00'
-33°00'
NGC 3621
11h 30m
11h 25m
11h 20m
11h 15m
11h 10m
11h 05m
11h 00m
Zone 261, Map 2
Mirror Image
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
-30°00'
h4418
-31°00'
h4430
h4428
h4439
-32°00'
h4389
-34°00'
-33°00'
NGC 3621
11h 00m
11h 05m
11h 10m
11h 15m
11h 20m
11h 25m
11h 30m
Zone 261, Map 3
Normal Image
Corvus
-25°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
Crater
-26°00'
Hussey 1490
-28°00'
-27°00'
Cordoba 127
-29°00'
NGC 3923
NGC 3904
12h 00m
11h 55m
11h 50m
N Hya
11h 45m
11h 40m
11h 35m
11h 30m
Zone 261, Map 3
Mirror Image
-25°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
Crater
Corvus
-26°00'
Hussey 1490
-28°00'
-27°00'
Cordoba 127
N Hya
11h 30m
11h 35m
-29°00'
NGC 3923
NGC 3904
11h 40m
11h 45m
11h 50m
11h 55m
12h 00m
Zone 261, Map 4
Normal Image
ξ
Xi Hya
-32°00'
-31°00'
-30°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
Dunlop 116
-33°00'
h4465
Innes 232
h4455
-34°00'
β Beta Hya
ο
12h 00m
11h 55m
11h 50m
11h 45m
11h 40m
11h 35m
11h 30m
Zone 261, Map 4
Mirror Image
-31°00'
-30°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
h4439
Xi Hya
-32°00'
ξ
Dunlop 116
-33°00'
h4465
Innes 232
β
-34°00'
h4455
Beta Hya
ο
11h 30m
11h 35m
11h 40m
11h 45m
11h 50m
11h 55m
12h 00m
Zone 261, Map 5
Normal Image
-37°00'
-36°00'
-35°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
Bos 2287
-38°00'
Howe 70
-39°00'
Dunlop 114
12h 00m
11h 55m
11h 50m
11h 45m
11h 40m
11h 35m
11h 30m
Zone 261, Map 5
Mirror Image
-37°00'
-36°00'
-35°00'
Sky charts generated by TheSky Software; used by permission of Software Bisque Inc.
Bos 2287
-38°00'
Howe 70
-39°00'
Dunlop 114
11h 30m
11h 35m
11h 40m
11h 45m
11h 50m
11h 55m
12h 00m
Zone 261
19 Double Stars, 4 Galaxies
B
Beta Hya .............................................. 13
Bos 2287 .............................................. 15
Howe 25................................................. 3
Howe 70............................................... 16
Hussey 1490........................................... 9
C
I
Cordoba 127 .......................................... 8
Innes 232.............................................. 14
D
N
Dunlop 114 .......................................... 15
Dunlop 116 .......................................... 11
N Hya..................................................... 8
NGC 3585 .............................................. 4
NGC 3621 .............................................. 6
NGC 3904 ............................................ 10
NGC 3923 ............................................ 10
H
h4412 ..................................................... 2
h4418 ..................................................... 3
h4428 ..................................................... 6
h4430 ..................................................... 5
h4439 ..................................................... 5
h4455 ................................................... 13
h4465 ................................................... 11
S
Stone 21 ................................................. 2
X
Xi Hya.................................................. 12
-1-
Zone 261
Zone 261, Map 1
Double Stars
Easy
h4412
Rating: 3 E
ADS 8080; HD 97021; SAO 179605
Position: 1110-2936
A
B
Magnitude
8.18
8.93
Separation PA
—
—
12.6 +
266 -
Year
—
1991
Spectra
A0 V
Colors
W
B
Notes:
1834: 12.0 @ 269. 20 measurements.
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 9.00 inches.
Separation: AB = 649 miles.
Distance (LY): 33,000
Total luminosity (Suns): 70,700
Stone 21
Rating: 4 E
ADS 8012
Position: 1100-2602
A
B
Magnitude
10.11
10.13
Separation PA
—
—
5.7 157 +
Notes:
1877: 6.0 @ 155. 8 measurements.
-2-
Year
—
1991
Spectra
F8
Colors
W
W
Zone 261
Observations:
C11 at 98x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 16.8 inches.
Separation: AB = 2,798 feet.
Distance (LY): 60
Total luminosity (Suns): 0.050
Moderate
Howe 25
Rating: 5 M
ADS 8038; HD 95855; SAO 179474
Position: 1103-2731
A
B
Magnitude
6.96
9.30
Separation PA
—
—
2.8 +
342 -
Year
—
1991
Spectra
A1 V
Colors
W
W
Notes:
1876: 2.0 @ 350. 28 measurements.
Observations:
C8 at 280x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 8.70 inches.
Separation: AB = 2.88 miles.
Distance (LY): 660
Total luminosity (Suns): 37
h4418
Rating: 5 M
ADS 8099
Position: 1115-2954
A
B
Magnitude
10.01
10.40
Separation PA
—
—
7.3 +
255 -
-3-
Year
—
1967
Spectra
A3
Colors
W
W
Zone 261
Notes:
1834: 5.0 @ 259. 7 measurements.
Observations:
C11 at 98x.
Deep Sky Objects
Difficult
NGC 3585
Other Names: H II 269, PGC 34160
Astronomical League Program: Herschel II Club
Rating: 2 D
Position: 1113-2645
Type: Gal
Surface brightness: 13.2
Class: SAB(s)0-: pec
Dimensions: 1.5' x 0.8'
Magnitude: 11.3
PA: 106
Observations:
C8 at 104x. It resembles a bright, "fuzzy" star. A 6m star lies 20 min W.
Distance (LY): 54,000,000
Radial velocity (km/sec): +1,233
Total luminosity (Suns): 6,900,000,000
-4-
Zone 261
Zone 261, Map 2
Double Stars
Easy
h4439
Rating: 3 E
HD 99727; SAO 202485
Position: 1128-3114
A
B
Magnitude
8.59
9.68
Separation PA
—
—
18.5 +
109 +
Year
—
1991
Spectra
A2 V
Colors
bW
O
Notes:
1834: 15.0 @ 102. 9 measurements.
Hipparcos/Tycho mission data show different distances for these stars (213 and 840
light years); they may be optical.
Observations:
C8 at 104x.
h4430
Rating: 4 E
HD 98950; SAO 202385
Position: 1123-3053
A
B
Magnitude
8.57
11.20
Separation PA
—
—
18.0 +
274 -
Notes:
1834: 15.0 @ 281. 4 measurements.
Observations:
C8 at 104x.
-5-
Year
—
1959
Spectra
K0 III
Colors
Y
?
Zone 261
h4428
Rating: 5 E
HD 98866; SAO 202374
Position: 1123-3054
A
B
Magnitude
8.18
11.50
Separation PA
—
—
22.0 140 -
Year
—
1987
Spectra
F8 V
Colors
W
?
Notes:
1898: 25.1 @ 147. 5 measurements.
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 3.60 inches.
Separation: AB = 15.7 miles.
Distance (LY): 456
Total luminosity (Suns): 9.41
Deep Sky Objects
Moderate
NGC 3621
Other Names: PGC 34554
Astronomical League Program: Herschel 400 Club
Rating: 4 M
Position: 1118-3249
Type: Gal
Surface brightness: 12.9
Class: SA(s)d III
Dimensions: 9.8' x 4.6'
Magnitude: 8.9
PA: 158
Observations:
30-inch + 40mm (94x) Very large but with extremely low surface brightness; it took
some time and much averted vision to pick up the extensive disk (although the nucleus is
quite small, bright and nearly stellar). It is about 4 to 1 in dimensions in a NNW/SSE
axis. A jagged diagonal line of bright stars lies just to the N.
-6-
Zone 261
Distance (LY): 20,000,000
Radial velocity (k/s): +730
Total luminosity (Suns): 8,700,000,000
NGC 3621
Galaxy (SA(s)d III)
30-inch Ruisinger + 40 mm = 94x
3/29/04 UT
-7-
Zone 261
Zone 261, Map 3
Double Stars
Easy
N Hya
Rating: 2 E
ADS 8202; HD 100286; SAO 179967; H III 96
Astronomical League Program: Double Star Club
Position: 1132-2915
A
B
Magnitude
4.93
5.90
Separation PA
—
—
9.3 211 +
Year
—
1993
Spectra
F8 V
F7 V
Colors
W
W
Notes:
1783: 9.8 @ 206. 55 measurements. The stars have similar proper motion.
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 3.60 inches; B = 12.3 inches.
Separation: AB = 1.26 miles.
Distance (LY): 87
Total luminosity (Suns): 9.37
Moderate
Cordoba 127
Rating: 5 M
ADS 8291
Position: 1145-2614
A
B
Magnitude
9.23
9.93
Separation PA
—
—
4.9 +
272 -
-8-
Year
—
1991
Spectra
K0 III
Colors
Y
rO
Zone 261
Notes:
1904: 4.8 @ 276. 11 measurements.
Observations:
C11 at 98x.
Difficult
Hussey 1490
Rating: 4 D
ADS 8360; HD 103787; SAO 180323
Position: 1157-2529
A
B
Magnitude
8.37
9.29
Separation PA
—
—
0.8 +
53 -
Year
—
1998
Notes:
1913: 0.7 @ 83. 32 measurements.
Observations:
C11 at 634x. I got a snowman on a night of 6/10 seeing.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 3.90 inches.
Separation: AB = 1.56 miles.
Distance (LY): 1,250
Total luminosity (Suns): 78
-9-
Spectra
F6/7 V
Colors
W
W
Zone 261
Deep Sky Objects
Moderate
NGC 3923
Other Names: H I 259, PGC 37061
Rating: 2 M
Position: 1151-2848
Type: Gal
Surface brightness: 13.3
Class: E4
Dimensions: 2' x 1'
Magnitude: 11.0
PA: 46
Observations:
C8 at 104x. It is bright and large with a brighter center. A very faint star lies to the
SW.
Model (where the Sun is a baseball):
Its diameter would be 17 million miles.
Distance (LY): 91,000,000
Radial velocity (km/sec): +1,551
Luminosity (suns): 26,000,000,000
NGC 3904
Other Names: H II 864, PGC 36918
Rating: 4 M
Position: 1149-2917
Type: Gal
Surface brightness: 12.7
Class: SA0-:
Dimensions: 1.5' x 1'
Magnitude: 12.0
PA: 15
Notes:
This galaxy produced supernova 1971C.
Observations:
C8 at 104x. It is small, round, and with starlike center.
Distance (LY): 60,000,000
Radial velocity (km/sec): +1,376
Total luminosity (Suns): 4,500,000,000
- 10 -
Zone 261
Zone 261, Map 4
Double Stars
Easy
h4465
Lalande 133; HD 101666; SAO 202717
Rating: 1 E
Position: 1142-3230
A
B
C
Magnitude
5.22
12.80
8.28
Separation
—
28.2 +!
66.1 +
PA
—
346 +!
44 -
Year
—
1934
1985
Spectra
K5 III
F7 V
Colors
dO!!
No
dB!!
Notes:
AB 1834: 7.0 @ 315. 8 measurements.
AC 1834: 60.0 @ 45. 12 measurements.
The primary is an infra-red source.
C has a 13.6m companion at 45. @ 111 (1944).
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 54.3 inches; C = 14.5 inches.
Separation: AB = 19.0 miles; AC = 44.4 miles.
Distance (LY): 430
Total luminosity (Suns): 128
Dunlop 116
Rating: 2 E
HD 103742; SAO 202966
Position: 1157-3216
A
B
C
Magnitude
7.83
7.25
10.74
Separation
—
18.7 +
24.3 -
PA
—
262 -?
333 +
- 11 -
Year
—
1994
1959
Spectra
G3 V
G0
Colors
W
W
?
Zone 261
Notes:
AB 1826: 15.2 @ 88. 33 measurements. Quadrant reversal?
AC 1933: 27.2 @ 324. 2 measurements.
The stars share a large common proper motion.
Observations:
C8 at 104x. Star C is very difficult.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 3.39 inches; B = 16.1 inches.
Separation: AB = 3.32 miles; AC = 4.32 miles.
Distance (LY): 114
Total luminosity (Suns): 1.328
Xi Hya
h4449; HD 100407; SAO 202558
Rating: 5 E
Position: 1133-3151
A
B
Magnitude
3.54
10.70
Separation PA
—
—
68.2 +
149 -
Year
—
1928
Spectra
G7 III
Colors
Y!
?
Notes:
1834: 60.0 @ 170. 5 measurements. The primary is an infra-red source and member
of the Hyades Group.
Observations:
C8 at 104x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 3.00 inches.
Separation: AB = 13.7 miles.
Distance (LY): 129
Total luminosity (Suns): 53.1
- 12 -
Zone 261
Moderate
h4455
Rating: 4 M
HD 100893; SAO 202622
Position: 1137-3334
A
B
C
Magnitude
5.71
7.90
13.30
Separation
—
3.4 +
47.9
PA
—
241 84
Year
—
1991
1897
Spectra
K0 III
Colors
yW
O
?
Notes:
Discovered by John Herschel in 1836; common proper motion pair.
AB 1835: 2.5 @ 248. 26 measurements.
AC 1 measurement.
Observations:
C8 at 280x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 46.2 inches.
Separation: AB = 1.87 miles; AC = 26.4 miles.
Distance (LY): 353
Total luminosity (Suns): 59.046
Difficult
Beta Hya
h4478; HD 103192; SAO 202901
Rating: 4 D
Position: 1153-3354
A
B
Magnitude
4.68
5.54
Separation PA
—
—
0.7 36 +
Year
—
1998
Spectra
Colors
B9 IIIp SI W
W
Notes:
1834: 1.7 @ 340. 72 measurements. The primary is an Alpha CVn variable.
This star is an Ap star. Ap stars are stars with peculiar spectra and are B5 to F5 types,
stars in which certain absorption lines are especially strong— such as manganese (in the
- 13 -
Zone 261
hottest), silicon, europium, chromium and strontium (in the coolest). Sometimes, the
spectral lines show variable intensity too, due (probably) to variable magnetic fields. The
hottest types are Bp stars.
All the peculiar spectrum stars are slow rotators and usually occur as single stars.
Their slow rotation gives them fairly stable outer atmospheres. The strong lines are due
to diffusion of elements (formed deep within the star) into the star's outer layers.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 18.6 inches.
Separation: AB = 2,059 feet.
Distance (LY): 365
Total luminosity (Suns): 308
Innes 232
Rating: 5 D
HD 101387; SAO 202686
Position: 1140-3327
A
B
Magnitude
6.84
9.40
Separation PA
—
—
2.2 161 -
Year
—
1991
Notes:
1897: 2.5 @ 170. 15 measurements.
Observations:
C8 at 280x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 2.40 inches.
Separation: AB = 1.63 miles.
Distance (LY): 475
Total luminosity (Suns): 37
- 14 -
Spectra
K1 III
Colors
Y
O
Zone 261
Zone 261, Map 5
Double Stars
Easy
Dunlop 114
Rating: 3 E
HD 101406; SAO 202689
Position: 1140-3806
A
B
Magnitude
6.65
8.88
Separation PA
—
—
17.1 +! 95 -
Year
—
1991
Spectra
G5 III
Colors
Y
B
Notes:
AB 1826: 3.0 @ 97. 16 measurements.
The stars share common proper motion even though Hipparcos gives different
distances (431 and 369 light years).
Observations:
C8 at 83x.
Bos 2287
Rating: 5 E
HD 102980; SAO 202873
Position: 1151-3656
A
B
Magnitude
7.85
11.13
Separation PA
—
—
8.8 +
226 -
Notes:
1913: 8.2 @ 227. 10 measurements.
Observations:
C8 at 104x. It lies just E of a 9m quadrangle.
- 15 -
Year
—
1992
Spectra
A0 V
Colors
W
?
Zone 261
Moderate
Howe 70
Rating: 4 M
HD 101327; SAO 202675
Position: 1140-3727
A
B
Magnitude
7.42
8.40
Separation PA
—
—
3.3 +
107 +
Year
—
1991
Notes:
1876: 2.5 @ 100. 21 measurements.
Observations:
C8 at 206x.
Scale model (in which the Sun is the size of a baseball):
Diameter: A = 4.20 inches.
Separation: AB = 1.21 miles.
Distance (LY): 235
Total luminosity (Suns): 6.7
- 16 -
Spectra
F6 V
Colors
W
O??
Zone 261
Zone 261 Mini-Catalog
Double Stars
Designation
Position
Rating
Map
h4465
1142-3230
1E
4
N Hya
1132-2915
2E
3
Dunlop 116
1157-3216
2E
4
h4412
1110-2936
3E
1
h4439
1128-3114
3E
2
Dunlop 114
1140-3806
3E
5
Stone 21
1100-2602
4E
1
h4430
1123-3053
4E
2
h4428
1123-3054
5E
2
Xi Hya
1133-3151
5E
4
Bos 2287
1151-3656
5E
5
h4455
1137-3334
4M
4
Howe 70
1140-3727
4M
5
Howe 25
1103-2731
5M
1
h4418
1115-2954
5M
1
Cordoba 127
1145-2614
5M
3
Beta Hya
1153-3354
4D
4
Hussey 1490
1157-2529
4D
3
Innes 232
1140-3327
5D
4
Component
A
B
C
A
B
A
B
C
A
B
A
B
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
- 17 -
Mag
5.22
12.80
8.28
4.93
5.90
7.83
7.25
10.74
8.18
8.93
8.59
9.68
6.65
8.88
10.11
10.13
8.57
11.20
8.18
11.50
3.54
10.70
7.85
11.13
5.71
7.90
13.30
7.42
8.40
6.96
9.30
10.01
10.40
9.23
9.93
4.68
5.54
8.37
9.29
6.84
9.40
Separation
—
28.2 +!
66.1 +
—
9.3 —
18.7 +
24.3 —
12.6 +
—
18.5 +
—
17.1 +!
—
5.7 —
18.0 +
—
22.0 —
68.2 +
—
8.8 +
—
3.4 +
47.9
—
3.3 +
—
2.8 +
—
7.3 +
—
4.9 +
—
0.7 —
0.8 +
—
2.2 -
PA
—
346 +!
66.1 +
—
211 +
—
262 -?
24.3 —
266 —
109 +
—
95 —
157 +
—
274 —
140 —
149 —
226 —
241 47.9
—
107 +
—
342 —
255 —
272 —
36 +
—
53 —
161 -
Zone 261
Deep Space Objects
Specifications
Object
NGC 3923
NGC 3621
NGC 3904
NGC 3585
Position
1151-2848
1118-3249
1149-2917
1113-2645
Rating
2M
4M
4M
2D
Map
3
2
3
1
Type
Gal (E4)
Gal (SA(s)d III)
Gal (SA0-:)
Gal (SAB(s)0-: pec)
- 18 -
Mag
11.0
8.9
12.0
11.3
Surface
Br
13.3
12.9
12.7
13.2
Pop