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Type: galaxy, Scd
Mag: B=11.7, V=?
Size: 5.623′ x 2.137′
Synonyms: H III-739
Discovered in 1788 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "vF, R, vgbM, easily resolvable, 3' diameter."
The RNGC (Sulentic and Tifft 1973) notes that this is a 12.0 mag galaxy. Their coded description reads S,EL,KNY&PCHY,PD.
Sandage, A. & Tammann, G. A. (1975) Steps toward the Hubble constant. V - The Hubble constant from nearby galaxies and the regularity of the local velocity field. ApJ, 196, 313-328. [1975ApJ...196..313S]
Sandage and Tammann (1975, Astrophysical Journal, 196, 313-328) includes this galaxy in the M101 Group. Members include NGC 5486 & NGC 6015.
Tom Lorenzin, in the e-version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "11.8M; 5.5' x 1.9' extent; faint, large, flat, NNW-SSE-oriented ellipse with little brighter center; 11M star 2' due W of core; 14M star 2' SSW of core; 10M star 7' due E of core; pair of 13M stars 4' SSW of core; !good supernova prospect! bright star 35' to WNW is 5M SAO 16848."
Lick: pa30. pair is 4' SSW, 45" sep.
POSS: m10.5 * 2'.3 W. gx in pa27. m13.5 * at 1'.9 in pa200.
15cm - faintly seen E of m10.5 *.
25cm - pa15, 3'x1'.25. broadly brtr to cen w/narrow bar occas seen. fat oval.
30cm - lg, not vconcen. 5'.5x1'.8 w/broad modlosfcbr core. sev *ings assoc,
partic SW of center. m13.5 * 2'.5 SW within halo. m12 * ~5' W.
Observing site: Little Bennett Regional Park
[15h 51m 24s, 62° 19m 0s] An elongated smudge. B: Sc.
The Messier objects
The Bennett objects
The Caldwell list
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