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Type: galaxy (AGN LINER-type), SB0
Mag: B=11.9, V=?
Size: 3.162′ x 2.818′
Synonyms: H I-010
Discovered in 1784 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it ""vB pL lE gmbM, 2'long, 1.5' broad."
The RNGC (Sulentic and Tifft 1973) notes that this is a 12.0 mag galaxy. Their coded description reads BNUC&BAR,VFDIF HALO SBO)).
G. de Vaucouleurs ("Galaxies and the Universe", Chapter 14 - Nearby Groups of Galaxies) notes that the five brightest members of the Virgo X group, a part of the Virgo II cloud complex, are NGC 4303, NGC 4636, NGC 4536, NGC 4517 & NGC 4643.
This galaxy appears on page 42 of "The Hubble Atlas of Galaxies" by Allan Sandage (1961, Washington, DC).
Photo Index by Jim Lucyk: Hubble Atl.of Gal. (Sandage 1961) p42.
NGC 4647-4649, Deep Sky #22 Sp88 p35, Astronomy mag. 3/77 p20.
Steve Coe, observing with a 13" f/5.6, notes: "Pretty bright, pretty large, much brighter middle, little elongated 1.2 X 1 in PA 135 at 135X."
Tom Lorenzin, in the e-version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "11.6M; 1.7' x 0.8' extent; bright, small, NW-SE-oriented oblong with much brighter center; see photo at HAG-42; 9M star 12' NNE."
Observing site: Little Bennett Regional Park
[12h 43m 18s, 1° 59m 0s] Bright nucleus, off centered envelop. B: SBa. WikiSky: No asymmetry seen.
The Messier objects
The Bennett objects
The Caldwell list
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