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Type: galaxy, Sc
Mag: B=11.8, V=?
Size: 4.677′ x 2.344′
Denning, W.F. (1892) Supposed variable nebulae. Astr. Nachr., No.3111.
(Sulentic and Tifft 1973) notes that this is a 12.5 mag galaxy. Their coded description reads S,EL,HISB,DIFKNPERIP.
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]
(1975, Astrophysical Journal, 196, 313-328) includes this galaxy in the NGC 6643 Group. Members include NGC 6217, NGC 6340, NGC 6412, NGC 6643 & NGC 6654.
G. de Vaucouleurs ("Galaxies and the Universe", Chapter 14 - Nearby Groups of Galaxies) notes that the five brightest members of the NGC 6643 group are NGC 6643, NGC 6217, NGC 6340, NGC 6412 & NGC 6654. NGC 6503 is a foreground member, and NGC 6621 is a background member.
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.
Foreground NGC 6503; background NGC 6621.
Brightest members: 6643 ( B(0) = 11.97), 6217 ( B(0) = 12.17), 6340 ( B(0) = 12.21), 6412 ( B(0) = 12.62), 6654 ( B(0) = 12.80).
by Jim Lucyk: Burnhams V2 p874, Hubble Atl.of Gal. (Sandage 1961) p35, Rev.Shapley-Ames Cat.of Bright Gal. (Sandage,Tammann 1981) p103.
This galaxy appears on page 35 of "The Hubble Atlas of Galaxies" by Allan Sandage (1961, Washington, DC).
Tom Lorenzin, in the e-version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "12M; 3'x 2' extent; see photo at HAG-35."
POSS: pa40. *s 1'.9 W, 1'.6 NW; m14 * 1'.2 SW (maybe what 25cm saw?).
15cm - not really.
- f, makes sm triangle w/vf *s to W. elong NE-SW, 1' diam.
- mod br but modlosfcbr @ 80x, fairly lg. 2'.5x1' in pa35. length approx = sep of NEmost m12 * flanking gx on W and another * SW (see sketch in notes). broad concen, only vf inconsp *ar nuc. BS, 29Jun1992, Anderson Mesa.
25cm - 3'x1' in pa50. br w/mod diffuse edges. br diffuse glow core 45" across w/*ar nuc.
- elong NE-SW, 1'.5x1'. broad concen, no sharp center. occas br spot seen SW of geom center.
30cm - nice, broad & grainy @ 140x. f *ar nuc. 2'.5x1'.75 in pa30. 220x: mottled texture, up to 3'x1'.75 via f halo. two m12 *s nrby on W in same pa as gx. little concen.
The Messier objects
The Bennett objects
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