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Type: galaxy, Sc
Mag: B=12.7, V=?
Size: 2.089′ x 0.912′
Synonyms: H II-906
Discovered in 1801 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "F, S, lE sp-nf, vglbM."
de Vaucouleurs, G. (1975) Nearby groups of galaxies. In: Kuiper, G. (ed) Stars and Stellar Systems. Volume 9: Galaxies and the Universe. Chapter 14, p557.
5. The nearer groups within 10 megaparsecs
G5. M101 (NGC 5457) Group. (may consist of 2 separate multiplets centred on M51 and M101.
Brightest members: 5457, 5194, 5055, 5195, 5585.
This is a traditional group, but its membership is somewhat uncertain. It is included by van den Bergh in his extended M94 group, but Holmberg and Sersic make it a separate group. … The major members, then, are M101 (NGC 5457) and its satellites NGC 5204, NGC 5474, NGC 5585 and the wide pair formed by M51 (NGC 5194 and companion NGC 5195) and M63 (NGC 5055); a probable member is NGC 5949, and possibly some outlying systems including NGC 4605, NGC 5907, NGC 6503, A1353 (Ho IV) and A1339 (Ho V). Many dwarfs are concentrated in the region … Except for NGC 5195 (type I0) all bright members of the group are spirals of type later than Sb and dwarf Magellanic irregulars … the overall dimensions of the group are 23° x 16°, and agan there is no central condensation.
(Sulentic and Tifft 1973) notes that this is a 13.0 mag galaxy. Their coded description reads SLEL,BM,HISB.
POSS: pa144, gx symmetrical. m14 * ~2' in pa95. pair 8'.3 NW (ADS 9666)
WDS: ADS 9666: 9.6,11.1; 19"; 45.
30cm - fairly f, though easy. at first glance appears circ, 1'.5 diam. averted
vis gives elong in pa150 w/mottling. pear-shaped overall w/lgr part
to S. m14 * SE. located 8' SE of m10.5 pair of 30" sep.
The Messier objects
The Bennett objects
The Caldwell list
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