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Type: galaxy (AGN), SBb
Mag: B=13.71, V=13.34
Size: 1.202′ x 1.071′
NGC 5804 is UGC 09627. In spite of a good position in the NGC, RNGC has managed to mangle the identifications of not just this, but also NGC 5794, NGC 5797, and NGC 5805 (which see), also in the area. N5804 has a bright Seyfert nucleus, easily visible on the Sky Survey prints as well as visually.
Synonyms: H III-679
Discovered in 1787 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "Two [NGC 5797 & NGC 5804] The preceding vS, vS. The following eF, eS."
The RNGC (Sulentic and Tifft 1973) notes that this is a galaxy. Their coded description reads IRREL,BM,HISB.
Steve Coe, using a 13" f/5.6, notes: "Very faint, pretty small, round and not brighter in the middle at 135X."
The Messier objects
The Bennett objects
The Caldwell list
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