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Type: galaxy, S0
Mag: B=11.8, V=?
Size: 5.248′ x 2.29′
Synonyms: H I-029
Discovered in 1784 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "vB, cL, elongated in the direction of the parallel of the declination, mbM."
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.
M66 Group: This is the well-known compact triplet of spirals including M65 (NGC 3623), M66 (NGC 3627) and NGC 3628 together with several outlying systems including probably NGC 3593, NGC 3596, and NGC 3666, and possibly NGC 3485, NGC 3489, NGC 3506 and NGC 3547.
The RNGC (Sulentic and Tifft 1973) notes that this is a 12.0 mag galaxy. Their coded description reads EL,BM,DKLN CTSUSP.
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 Leo Group. Members include NGC 3338, NGC 3351, NGC 3368, NGC 3377, NGC 3379, NGC 3384, NGC 3389, NGC 3412, NGC 3489, NGC 3593, NGC 3596, NGC 3605, NGC 3607, NGC 3608, NGC 3623, NGC 3626, NGC 3627, NGC 3628, NGC 3686 & NGC 3810.
Tom Lorenzin, in the electronic version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "12M; 3' x 1' extent; small and dim spindle with axis oriented E-W; almost stellar nucleus; !good supernova prospect! 1 degree WSW of M-65."
Steve Coe, in "SACNEWS On-Line for April 1996", using a 12.5" f/6, notes: NGC 3593 is pretty bright, pretty large, elongated and has a much brighter middle. What is bizarre about this galaxy is that at 200X in the 12.5", the core is elongated 2X1. I don't remember seeing an elongated nucleus in a galaxy before.
This pl, pf very elongated galaxy is most interesting. Using a 25"
scope I immediately saw a dark rift north of the core, extending
across the galaxy. The more I'd try to confirm it the more difficult
it became. Funny how much more a relaxed eye can see. Ted Forte saw
it as more of a knotty region with his 18". Vickers' picture of
N3593 is too overexposed, as is the CCD images on Real Sky. Is there
a rift in this galaxy?
The SkyView DSS image suggests there's a weak rift on the north side
of the bulge, but not a dramatic one.
FWIW here's an observation I made some time ago:
Observed 3/3/1984 with 8-inch f/6 Newtonian at Rixeyville, VA. Pretty large, pretty bright, oval. Brightens rapidly to a stellar nucleus.
The image in the Digital Sky Survey clearly shows a rift, but it is not an obvious one such as 891 or 4565. See:
Hope this helps...
Observing site: Little Tycho Observatory
[11h 14m 36s, 12° 49m 0s] A really faint smudge, if seen at all.
Sky Conditions:The fainter parts of the Milky Way are barely visible.Haziness only visible on the horizon.Atmosphere stable with little interference.
This faint galaxy's spiral arms are just barely seen at 75*as an elongated smudge of faint light.This galaxy measures 3.8'*0.9'with PA WNW/ESE.The nucleus of this galaxy only starts getting slightly brighter compared to the spiral arms of this galaxy.
The Messier objects
The Bennett objects
The Caldwell list
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