Harold Corwin

IC 2447 is probably Javelle's third observation of IC 2446 with some mistake in the declination. He has two observations of IC 2446 (on 8 April 1896 and 26 March 1900) which clearly point to the galaxy. His RA from those two nights is identical to that for IC 2447, which he observed on only one other night, 8 Jan 1900. He claims to have used the same star for comparison. (I checked the obvious mistakes he could have made: sign errors and incorrectly identified comparison star -- nothing in the area matches.)

The difference in declination is 12 arcmin 38.2 arcsec. Perhaps this points to a reading or reduction error, but I do not now know what it might be. I have in mind a unit multiple of his eyepiece scale, or of his micrometer dial's rotation -- something like that. Perhaps we can find the answer in other papers in the Nice Observatory's Publications.

― IC Notes by Harold Corwin

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