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Type: galaxy, Sbc
Mag: B=12, V=?
Size: 3.09′ x 0.933′
Synonyms: H II-432
Discovered in 1785 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "pB, cL, E 75 degrees sp-nf, 3' long."
This 12.4 magnitude spiral galaxy is recorded in the NGC as "pretty faint, considerably large, elongated 12 , very gradually brighter in the middle."
pF, s.5'x1', mE 20deg, spiral.
Knox Shaw, H. (1915) Note on the nebulae and star clusters shown on the Franklin-Adams plates. M.N.R.A.S., 76(2), 105-107.
Comments on papers by Harding (MNRAS, 74(8)), and Melotte (MemRAS 60(5)) describing objects foundon the Franklin-Adams plates; compares with plates taken with the Reynolds reflector (Helwan Obs Bull. 9-15):
NGC 7721 is an elongated spiral. [previously included in Class II-Spindle-shaped Nebulae]
(Sulentic and Tifft 1973) notes that this is a 12.5 mag galaxy. Their coded description reads S,EL,BM,SLDIF,BKNS DKPCHS NRCT,PD SSTR.
by Jim Lucyk: Sky&Tel. 3/69 p148.
Lorenzin, in the e-version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "12.4M; 2.6' x 1' extent; soft oblong with little brighter center; alone in a starless void."
Coe, using a 17.5" f/4.5, notes: "Faint, pretty large, elongated 2x1, with a somewhat brighter middle."
POSS: SB(s)cdIII in pa18.
15cm - barely vis.
- nice mod f gx @ 80x elong in pa20. 140x: halo occas stretches out as long
as sep to m12 * 5' SW. main body 2'.5x0'.8 w/wk even concen. no core or
nuc. fairly smooth texture, but a few occas *ings. BS, 14Oct1990,
25cm - fairly f, little concen to center. 2'x0'.75 in pa 30, lenticular outline,
core somewhat mottled at 180x. BS, Roof.
30cm - velong at lox, 3'x1' in pa30. little concen w/*ings in middle. hix: poor
uneven concen, mottly elong core.
The Messier objects
The Bennett objects
The Caldwell list
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