Sky and Telescope - April 2015 - 41
One Amazing Night: Herschel's Spring Success
4908 as a separate object, immediately north of IC 4051,
but observers wishing to view the correct Herschel object
should locate IC 4051, the southernmost object in a chain
of four galaxies.
Three more Herschel discoveries stand south of IC
4051. NGC 4921 is the largest and most brilliant of the
three, a face-on barred spiral with a bright core in a diffuse outer spiral structure. Immediately south-southeast
of it shines NGC 4923, a concentrated lenticular galaxy.
The third object is NGC 4911, a high surface brightness,
compact spiral. Northeast of NGC 4921 is the edge-on
lenticular galaxy NGC 4927. A roughly similar distance to
its northeast is another lenticular, the slightly larger and
more luminous NGC 4944. William described the galaxies together as, "Three. The two following pretty near
each other. The south preceding about 8′ distance. The
time is that of the two."
At this point, William left behind the main concentration of the Coma Cluster, though a few of its outliers
remained to be recorded in the register. The first of these,
the aforementioned NGC 4952, was another case of a
previously discovered object being identified as a new one
when a different reference star was used to determine
its position. But a look 1½° to the south of NGC 4952
°
revealed another Coma Cluster member, the elliptical galaxy NGC 4957. To its northeast was a much closer spiral
galaxy, NGC 4961.
The final three outlying Coma Cluster members,
arrayed around the bright star Beta (β) Comae, were all
described as very faint objects. NGC 4983 is the smallest of the trio; in photographs, it shows a probable barred
spiral with a bright core and a faint outer disk. NGC 5000
and NGC 5032 are nearly face-on barred spiral galaxies
with inner ring structures.
The pace now slowed dramatically for the Herschels as
observable objects thinned out considerably. Three widely
separated faint galaxies came into view: NGC 5116, NGC
5251, and NGC 5263. Of the three, NGC 5263 may be
the most appealing target, a small nearly edge-on galaxy
to the east of the spectacular globular cluster M3. One
can imagine William's sense of relief as the large, bright
cluster came into the eyepiece, a brilliant object appearing
after a hectic night of observing dozens of fainter objects.
Herschel was now entering a section of sky that he'd
swept on May 17th of the previous year, recording the
large, loose globular NGC 5466 as well as the faint galaxies NGC 5635 and NGC 5735. He found nothing new this
night until, more than 90 minutes later, he spotted NGC
5958, then NGC 6001, two small, faint face-on spiral
galaxies in Corona Borealis. The long night of discovery
was at an end.
As the accompanying table shows, the final tally was
remarkable, with 74 objects recorded during the marathon
session. Perhaps we should pause to acknowledge the
remarkable persistence and determination of Caroline,
NGC
3196
3245
3265
Herschel No.
III 348
I 86
III 349
Con
Leo
LMi
LMi
Mag (v)
14.9
10.8
13.5
Size
RA
Dec
0.3′ × 0.2′
10h
18.8m
+27° 40′
°
3.2′ × 1.8′
10h
27.3m
+28° 30′
1.3′ × 1.0′
10h
31.1m
+28° 48′
32.3m
+27° 40′
3274
II 358
Leo
12.6
2.1′ × 1.0′
10h
3277
II 359
LMi
11.7
1.9′ × 1.7′
10h 32.9m
+28° 31′
3380
II 360
LMi
12.7
1.7′ × 1.3′
10h 48.2m
+28° 36′
3400
II 361
LMi
13.4
1.3′ × 0.8′
10h 50.8 m
+28° 28′
3.5′ × 2.6′
10h
51.3m
+27° 59′
1.4′ × 1.1′
10h
51.4m
+28° 07′
1.7′ × 0.8′
10h
54.4m
+27° 14′
7.1′ × 5.2′
11h
00.4m
+28° 58′
03.2m
+27° 58′
3414
3418
3451
3486
II 362
II 363
II 364
I 87
LMi
LMi
LMi
LMi
10.9
13.4
13.1
10.5
3504
I 88
LMi
11.8
2.7′ × 2.1′
11h
3510
II 365
LMi
12.3
4.0′ × 0.8′
11h 03.7m
+28° 53′
3512
II 366
LMi
12.9
1.6′ × 1.5′
11h 04.1m
+28° 02′
°
3527
III 350
UMa
13.9
1.0′ × 0.9′
11h 07.3m
+28° 32′
1.0′ × 1.0′
11h
10.7m
+28° 46′
0.6′ × 0.5′
11h
10.7m
+28° 42′
1.2′ × 0.8′
11h
31.7m
+28° 09′
0.5′ × 0.4′
11h
31.9m
+28° 21′
58.1m
+27° 53′
3550
3552
3713
3714
III 351
III 352
II 367
III 353
UMa
UMa
Leo
UMa
13.2
14.5
13.3
13.3
4004
III 354
Leo
13.6
1.8′ × 0.6′
11h
4008
II 368
Leo
11.8
2.5′× 1.3′
11h 58.3m
+28° 12′
4017
II 369
Com
12.7
1.8′ × 1.4′
11h 58.8m
+27° 27′
4080
III 355
Com
13.9
1.2′ × 0.5′
12h 04.9m
+27° 00′
2.6′ × 1.5′
12h
06.7m
+28° 10′
1.3′ × 0.7′
12h
08.8m
+29° 18′
1.1′ × 0.3′
12h
09.0m
+29° 15′
2.2′ × 0.9′
12h
09.2m
+29° 11′
12.3m
+29° 11′
4104
4131
4132
4134
II 370
III 356
III 357
II 371
Com
Com
Com
Com
12.2
13.3
14.0
13.1
4169
III 358
Com
12.3
1.8′ × 0.9′
12h
4173
II 372
Com
13.3
5.0′ × 0.7′
12h 12.3m
+29° 13′
4174
III 359
Com
13.6
0.8′ × 0.3′
12h 12.5m
+29° 09′
4175
III 360
Com
13.4
1.8′ × 0.4′
12h 12.5m
+29° 10′
2.6′ × 1.9′
12h
13.4m
+28° 31′
1.2′ × 0.9′
12h
14.5m
+28° 25′
Non-existent
12h
15.4m
+28° 28′
3.6′ × 1.5′
12h
18.1m
+28° 11′
19.9m
+27° 37′
+29° 17′
4185
4196
4209
4251
II 373
II 374
II 375
I 89
Com
Com
Com
Com
12.3
12.9
-
10.6
4275
II 376
Com
12.8
0.8′ × 0.7′
12h
4278
I 90 = II 322
Com
10.2
4.1′ × 3.8′
12h 20.1m
Angular sizes and separations are from recent catalogs. Visually, an object's size is often smaller
than the cataloged value and varies according to the aperture and magnification of the viewing
instrument. Right ascension and declination are for equinox 2000.0.
Sk yandTelescope.com April 2015
41
http://www.SkyandTelescope.com
Sky and Telescope - April 2015
Table of Contents for the Digital Edition of Sky and Telescope - April 2015
Contents
Sky and Telescope - April 2015 - Cover1
Sky and Telescope - April 2015 - Cover2
Sky and Telescope - April 2015 - 3
Sky and Telescope - April 2015 - Contents
Sky and Telescope - April 2015 - 5
Sky and Telescope - April 2015 - A
Sky and Telescope - April 2015 - B
Sky and Telescope - April 2015 - 6
Sky and Telescope - April 2015 - 7
Sky and Telescope - April 2015 - 8
Sky and Telescope - April 2015 - 9
Sky and Telescope - April 2015 - 10
Sky and Telescope - April 2015 - 11
Sky and Telescope - April 2015 - 12
Sky and Telescope - April 2015 - 13
Sky and Telescope - April 2015 - 14
Sky and Telescope - April 2015 - 15
Sky and Telescope - April 2015 - 16
Sky and Telescope - April 2015 - 17
Sky and Telescope - April 2015 - 18
Sky and Telescope - April 2015 - 19
Sky and Telescope - April 2015 - 20
Sky and Telescope - April 2015 - 21
Sky and Telescope - April 2015 - 22
Sky and Telescope - April 2015 - 23
Sky and Telescope - April 2015 - 24
Sky and Telescope - April 2015 - 25
Sky and Telescope - April 2015 - 26
Sky and Telescope - April 2015 - 27
Sky and Telescope - April 2015 - 28
Sky and Telescope - April 2015 - 29
Sky and Telescope - April 2015 - 30
Sky and Telescope - April 2015 - 31
Sky and Telescope - April 2015 - 32
Sky and Telescope - April 2015 - 33
Sky and Telescope - April 2015 - 34
Sky and Telescope - April 2015 - 35
Sky and Telescope - April 2015 - 36
Sky and Telescope - April 2015 - 37
Sky and Telescope - April 2015 - 38
Sky and Telescope - April 2015 - 39
Sky and Telescope - April 2015 - 40
Sky and Telescope - April 2015 - 41
Sky and Telescope - April 2015 - 42
Sky and Telescope - April 2015 - 43
Sky and Telescope - April 2015 - 44
Sky and Telescope - April 2015 - 45
Sky and Telescope - April 2015 - 46
Sky and Telescope - April 2015 - 47
Sky and Telescope - April 2015 - 48
Sky and Telescope - April 2015 - 49
Sky and Telescope - April 2015 - 50
Sky and Telescope - April 2015 - 51
Sky and Telescope - April 2015 - 52
Sky and Telescope - April 2015 - 53
Sky and Telescope - April 2015 - 54
Sky and Telescope - April 2015 - 55
Sky and Telescope - April 2015 - 56
Sky and Telescope - April 2015 - 57
Sky and Telescope - April 2015 - 58
Sky and Telescope - April 2015 - 59
Sky and Telescope - April 2015 - 60
Sky and Telescope - April 2015 - 61
Sky and Telescope - April 2015 - 62
Sky and Telescope - April 2015 - 63
Sky and Telescope - April 2015 - 64
Sky and Telescope - April 2015 - 65
Sky and Telescope - April 2015 - 66
Sky and Telescope - April 2015 - 67
Sky and Telescope - April 2015 - 68
Sky and Telescope - April 2015 - 69
Sky and Telescope - April 2015 - 70
Sky and Telescope - April 2015 - 71
Sky and Telescope - April 2015 - 72
Sky and Telescope - April 2015 - 73
Sky and Telescope - April 2015 - 74
Sky and Telescope - April 2015 - 75
Sky and Telescope - April 2015 - 76
Sky and Telescope - April 2015 - 77
Sky and Telescope - April 2015 - 78
Sky and Telescope - April 2015 - 79
Sky and Telescope - April 2015 - 80
Sky and Telescope - April 2015 - 81
Sky and Telescope - April 2015 - 82
Sky and Telescope - April 2015 - 83
Sky and Telescope - April 2015 - 84
Sky and Telescope - April 2015 - 85
Sky and Telescope - April 2015 - 86
Sky and Telescope - April 2015 - Cover3
Sky and Telescope - April 2015 - Cover4
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