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RA: 12h 40m 0.36s
Dec: +61° 36′ 32.2″
Con: Ursa Major
Ch: MSA:558, U2:26, SA:2
Type: galaxy, S
Mag: B=10.8, V=?
Size: 6.025′ x 2.454′
Synonyms: H I-254
Discovered in 1790 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "eB, E in parallel, 5' long, all over equally bright, except just on the edges."
(Sulentic and Tifft 1973) notes that this is a 11.5 mag galaxy. Their coded description reads EL,HISB,FDIFHALO.
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.
Schmidt K.-H., Priebe A. & Boller T. (1993) Nearby galaxies. Revised machine-readable version of the catalogue. Astron. Nachr., 314, 371. [1993AN....314..371S]
Other names: "U7831,10-18-074". Inclination: (face-on, in degrees) 68 Total photoelectric blue mag 10.89 Total colour index .56 Logarithm of the angular diameter D25 (arcminutes) 1.76 Blue photographic magnitude 10.93 This galaxy is included in a sample of galaxies with velocity less than 500km/s with respect to the centroid of the Local Group. [Nearby Galaxies. Schmidt K.-H., Priebe A., Boller T. (Astron. Nachr. 314, 371 (1993))]
says that this spiral is well suited for small telescopes. "This cigar-shaped galaxy, about 1' wide and 5' long, can be easily picked up while sweeping. ... my longstanding estimate of visual magnitude 10.0 for the galaxy agrees well with my estimate of 10.2 .. with the 5-inch apogee scope."
Lorenzin, in the e-version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "10.9M; 4' x 1.2' extent; bright, NNW-SSE-oriented oblong with little brighter center; !good supernova prospect!."
Observing site: Little Tycho Observatory
[12h 40m 0s, 61° 37m 0s] The very faintest of smudges against this fairly dark (for this light polluted sky) sky. Without the finder chart, I would have seen nothing.
The Messier objects
The Bennett objects
The Caldwell list
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