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IC 146
IC 146
History and Accurate Positions for the NGC/IC Objects (Corwin 2004)
IC 146 = NGC 648. The NGC object is one of those found at Leander McCormick soon after their 26-inch refractor went into service. The galaxy not given a good position: the nominal RA is 1.6 minutes of time too far east -- though the declination is only two arcminutes out -- and there is no surviving sketch. There are no other candidate galaxies, so the identification is pretty secure. The eastward RA error is a common one in the first two lists of nebulae found with the 26-inch.
The position was corrected by Herbert Howe in one of his Monthly Notices articles. Dreyer copied Howe's corrected RA into the IC2 Notes. Unfortunately, neither Howe nor Dreyer noticed that the corrected position coincided with that of IC 146, found in September of 1892 by Javelle with the 30-inch refractor at Nice. Javelle's micrometrically measured position is good, and the IC identity is not in doubt.
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Favourite lists
Lacaille's catalogue
The Messier objects
Dunlop's catalogue
The Bennett objects
The Caldwell list
Named DSOs
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