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RA: 23h 17m 13.62s
Dec: +18° 42′ 28.4″
Ch: MSA:1209, U2:169, SA:9
Type: galaxies (interacting), E
Mag: B=15, V=?
Size: 2.123′ x 1.614′
NGC 7578. The modern catalogues make a small mess of this NGC number, so here are the facts in RA order (the positions are from HKA):
RA (1950.0) Dec Hickson VV UGC RC2/3 23 14 42.50 +18 25 39.5 94b=N7578A 181b 12477=N7578a N7578A 23 14 44.00 +18 26 04.4 94a=N7578B 181a 12478=N7578b N7578B
Hickson and VV did things logically (by magnitude), choosing the brightest component as "a". UGC followed its internal scheme, also logical, of choosing component letters by RA. RC2/3 followed UGC.
Looking at the NGC, we see that N7578 was only observed by William and John Herschel. Though WH noted "4 or 5 small stars with nebulosity," JH saw only one object here which he succinctly described with a single letter "F." Neither of their positions is good enough to pin down one or the other of the galaxies as the real N7578, but since Hickson 94a is brighter by over 0.6 mag, I think that we can choose it as N7578 without bending the history too much.
So, I have ignored the NGC identifications in Hickson, UGC, and RC2/3; and have made the brighter north-following object (UGC 12478) = NGC 7578.
This group, buy the way, may also be NGC 7571, which see.
Synonyms: H III-182
Discovered in 1784 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "4 or 5 small stars with nebulosity. 240 left doubt."
Listed as No. 170 in Arp's "Atlas of Peculiar Galaxies" (Astrophysical Journal Supplement, vol. 14, 1966.)
NGC 7578A: The RNGC (Sulentic and Tifft 1973) notes that this is a 15.0 mag galaxy. Their coded description reads STEL.
NGC 7578B: The RNGC (Sulentic and Tifft 1973) notes that this is a 15.0 mag galaxy. Their coded description reads STEL,INLGDIF NEB.
The Messier objects
The Bennett objects
The Caldwell list
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