Harold Corwin

IC 2365 is probably IC 2366. The galaxy is actually IC 2366, not IC 2365 as it is usually called. IC 2366 and IC 2361 were measured by Javelle on the same two nights (22 Apr 1897 and 26 Feb 1900), and were referred to the same star, BD+28 1602. Their positions, as measured by him, reduce to within a couple of arcseconds of the modern positions for the galaxies.

He found IC 2365, however, on another night, 11 Feb 1896. Supposedly referred to the same BD star, his reduced position for this object falls exactly 2.5 arcmin north of the galaxy in an empty bit of sky.

My guess, before I checked the POSS1 prints, was that Javelle misidentified his comparison star on that night, and that there might be another star/galaxy pair nearby which he actually measured. Well, there isn't. I searched the POSS1 for this and found nothing within several degrees of Javelle's nominal position.

So, my best guess is that IC 2365 is identical to IC 2366, but with a 2.5 arcmin measuring or reduction error.

― IC Notes by Harold Corwin

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