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RA: 23h 22m 6.52s
Dec: +40° 50′ 45.1″
Ch: MSA:1120, U2:88, SA:9
Type: galaxy (in group), SBc
Mag: B=11.6, V=?
Size: 10′ x 1.949′
Synonyms: H II-600
Discovered in 1786 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "pB, mE np-sf but nearly in the meridian, lbM, resolvable, 5' long, 1.5' broad; also observed in 1784."
Hardcastle, J.A. (1914) Nebulae seen on the Franklin-Adams plates. MNRAS, 74(8), 699-707. [commentary in Shapley, H. & Ames, A. (1932) A survey of the external galaxies brighter than the thirteenth magnitude.]
Classified as "Elongated."
Notes: "Lick Obs. Bull. 248, spiral."
(Sulentic and Tifft 1973) notes that this is a 11.5 mag galaxy. Their coded description reads SB,MINC,BM,BDDIFARMS.
This galaxy appears on page 49 of "The Hubble Atlas of Galaxies" by Allan Sandage (1961, Washington, DC).
by Jim Lucyk: Hubble Atl.of Gal. (Sandage 1961) p49.
Houston writes: "When the seeing and transparency are good, I can find the edge-on galaxy NGC 7640 from Connecticut with the 4-inch Clark. The view was easier from Kansas with the 10-inch. I make the magnitude of this difficult object to be about 10.9." In 1971 he called it a difficult galaxy: "a 12.5-inch once revealed it to me neatly as a narrow spindle, about as bright as a 12th mag star."
lists this spiral galaxy in Andromeda as 10.9 magnitude and 10.7' x 2.5' in size.
6cm - lg, diffuse, w/o concen. elong N-S, w/*s nrby.
15cm - barely vis @ 95x. BS.
25cm - fairly f. elong N-S, 7' long. enclosed in triangle of *s 5' on-a-side; gx
strung along W base. core mottled w/dk spots, 3'x1'. on E is m13.5 *. BS.
30cm - w/in triangle of m12.5 *s. pa170, 7'x2'. on sl concen to 1'.5 core, no
nuc. distracting m13.5 * on SE edge of core. inner halo mottled. CBL.
Lorenzin, in the e-version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "12.5M; 9' x 1' extent; very dim slash; nearly edge-on spiral; axis oriented N-S; little brighter center surrounded by right triangle of 12M stars with apex pointed E; fairly easy to see considering low magnitude; !good supernova prospect! <2 degrees SSW of planetary N7662; see photo at HAG-49."
Alldays (22.50S, 20.12E, 770m).
12-inch f/10 SCT (95x, 218x)
Very elongated. Soft and just a whisper of light in a N-S direction. I will come back to this one. Oval, large core brighten slowly.
The Messier objects
The Bennett objects
The Caldwell list
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