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Type: galaxy, S0
Mag: B=14.2, V=?
Size: 1.548′ x 0.758′
Synonyms: H III-552
Discovered on May 1, 1786 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "Two [NGC 5546 & NGC 5549] Both eF, vS. The place is that of the following. The first precedes the last 3 or 4'." In the Notes to the 'Catalogue of a Second Thousand of New Nebulae and Cluster of Stars' a comment reads: "The distance was underestimated, if they were h.1770 and h.1772, delta R.A. of which is 30 seconds, the second being 11' south. A second observation of May 12, 1793 (Sweep 1042) has only one, pB, S, BN. This agrees perfectly with the correct place of h.1772 and differs only 2' from the first observation. It is, however, very probably that H. in 1786 observed NGC 5542 and NGC 5546 (h.1770), 4' pf., but in that case his RA was 30 seconds too great and P.D. 12' too great. He adds: 'A little inaccurate. I would not stay to verify it properly, so that there remains some little doubt.' "
The RNGC (Sulentic and Tifft 1973) notes that this is a 14.0 mag galaxy. Their coded description reads E,SLEL,BM.
The Messier objects
The Bennett objects
The Caldwell list
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