Sky and Telescope - April 2015 - 42
The Herschel Sprint
One Amazing Night: Herschel's Spring Success
ABELL 1656
NGC
Herschel No.
Con
Mag (v)
Size
RA
Dec
4283
II 323 = II 377
Com
12.1
1.5′ × 1.5′
12h 20.4m
+29° 19′
2.2′ × 1.2′
12h
22.4m
+29° 13′
1.6′ × 1.4′
12h
25.0m
+28° 34′
3.2′ × 3.0′
12h
25.9m
+27° 34′
28.3m
+28° 37′
4310
II 378
4375
II 379
4393
III 361
Com
Com
Com
12.3
13.0
12.2
4448
I 91
Com
11.2
3.9′ × 1.4′
12h
4475
III 362
Com
13.5
2.0′ × 1.0′
12h 29.8m
+27° 15′
4556
II 380
Com
13.2
1.2′ × 1.0′
12h 35.8m
+26° 55′
12h
36.0m
IC 4051
NGC 4927
+27° 58′
I 92
Com
10.0
10.7′ × 4.4′
4692
II 381
Com
12.8
1.3′ × 1.3′
12h 47.9m
+27° 13′
4793
I 93
Com
11.9
2.8′ × 1.5′
12h 54.7m
+28° 56′
54.9m
+27° 25′
4798
II 382
Com
13.2
1.2′ × 0.9′
12h
4816
II 383
Com
12.8
1.3′ × 1.1′
12h 56.2m
+27° 45′
4827
II 384
Com
12.8
1.4′ × 1.3′
12h 56.7m
+27° 11′
4.0′ × 1.9′
12h
57.4m
+27° 30′
57.5m
+27° 37′
4839
II 386
Com
12.1
4840
II 385
Com
13.9
0.7′ × 0.7′
12h
4841
II 387
Com
13.1
1.6′ × 1.0′
12h 57.5m
+28° 29′
0.7′ × 0.7′
12h
59.4m
+27° 55′
1.9′ × 1.9′
12h
59.6m
+27° 58′
00.1m
+27° 59′
4869
II 388
4874
II 389
Com
Com
13.8
12.2
4889
II 391
Com
11.9
2.9′ × 1.9′
13h
4892
II 390
Com
13.8
1.3′ × 0.3′
13h 00.1m
+28° 00′
NGC 4869
NGC 4923
NGC 4911
William and Caroline Herschel discovered some 20 new
galaxies in the heart of the Coma Cluster (Abell 1656).
Visit Skypub.com/herschelsprint for the
V
entire listing of Herschel's night of discovery.
+26° 54′
00.9m
NGC 4874
NGC 4921
POSS-II / STSCI / CALTECH / PALOMAR OBSERVATORY
4559
NGC 4889
IC 4051
III 363
Com
13.2
1.0′ × 0.9′
13h
4911
II 392
Com
13.2
1.4′ × 1.3′
13h 00.9m
+27° 47′
2.5′ × 2.2′
13h
01.4m
+27° 53′
0.8′ × 0.8′
13h
01.5m
+27° 51′
0.8′ × 0.6′
13h
02.0m
+28° 00′
1.7′ × 0.6′
13h
03.8m
+28° 11′
1.8′ × 1.1′
13h
05.0m
+29° 07′
1.2′ × 1.0′
13h
05.2m
+27° 34′
1.6′ × 1.1′
13h
05.8m
+27° 44′
1.1′ × 0.7′
13h
08.5m
+28° 19′
1.7′ × 1.4′
13h
09.8m
+28° 54′
2.1′ × 1.1′
13h
13.5m
+27° 48′
2.0′ × 0.7′
13h
22.9m
+26° 59′
0.7′ × 0.7′
13h
37.4m
+27° 25′
1.6′ × 0.4′
13h
39.9m
+28° 24′
1.0′ × 1.0′
15h
34.8m
+28° 39′
1.0′ × 1.0′
15h
47.8m
+28° 39′
4921
4923
4927
4944
4952
4957
4961
4983
5000
5032
5116
5251
5263
5958
6001
II 393
II 394
III 364
II 395
II 396 = III 303
II 397
II 398
III 365
III 366
III 367
III 368
III 369
III 370
II 399
III 371
Com
Com
Com
Com
Com
Com
Com
Com
Com
Com
Com
Boö
CVn
CrB
CrB
12.3
13.7
13.8
12.9
13.0
13.1
12.8
14.0
13.4
12.8
12.9
13.9
13.4
12.7
13.7
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.
42
April 2015 sky & telescope
who faithfully recorded positions and descriptions for
each and every object, writing them down in her register
with a quill pen! Unfortunately, William didn't recognize
the cluster of nebulae he'd discovered, even though he
recorded 23 of them. Discovery of the Coma Cluster is
generally credited to Heinrich d'Arrest, who noted the
group of faint nebulae in 1865.
Accepting that NGC 4209 doesn't exist, and that William had discovered NGC 4278, NGC 4283, and NGC
4952 previously, that still gave the Herschels a total of 70
newly discovered galaxies, an unprecedented accomplishment, and one never equaled by any of the 72 nineteenthcentury visual observers who subsequently contributed
to Dreyer's New General Catalogue. The only observer
to come close was John Herschel, who recorded 38 new
objects, 34 of them in the Large Magellanic Cloud, on
December 23, 1834. Even more remarkable: there are
7,093 independent objects in the New General Catalogue,
eliminating duplicate entries, nonexistent objects, and
entries associated with single, double, or multiple stars.
Fully one percent of those 7,000+ objects were discovered
on one night, April 11, 1785, by one of the greatest visual
observers of all time. ✦
Mark Bratton is the author of The Complete Guide to the
Herschel Objects (Cambridge University Press, 2011).
http://www.Skypub.com/herschelsprint
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
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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
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Sky and Telescope - April 2015 - 86
Sky and Telescope - April 2015 - Cover3
Sky and Telescope - April 2015 - Cover4
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