Harold Corwin

IC 2374 and IC 2376. The CGCG identifications for these two galaxies are wrong. Here's the story:

Here is a table comparing Javelle's original positions with those in CGCG and GSC for the four galaxies that he found in the cluster:

Javelle GSC CGCG
Galaxy RA(1950.0) Dec RA (1950.0) Dec RA(1950) Dec Type

IC 2374 08 25 16.2 +30 36 35 (08 25 16.9 +30 36 35 ) 08 25.2 +30 37 SB(s)bc II?
IC 2376 08 25 20.7 +30 34 21 08 25 20.87 +30 34 26.4 08 25.3 +30 35 E3: (SW comp)
IC 2378 08 25 25.9 +30 35 49 08 25 26.37 +30 35 52.0 08 25.4 +30 36 SA0^o
IC 2380 08 25 38.5 +30 34 12 08 25 38.67 +30 34 16.4 08 25.6 +30 35 Sa:

I re-reduced Javelle's positions from his offsets from his comparison star BD+30 1715 using the position from the GSC (08 26 22.38, +30 32 59.5, 1950.0) rather than the BD position which Javelle himself used.  This means that the positions in my table will not be quite the same as the NGC positions.  GSC, unfortunately, does not include IC 2374, so the position in parentheses for it is my own, measured by offsetting from IC 2378 (the GSC positions are good to about an arcsec, my offset position is good to about 2-3 arcsec).  Javelle, by the way, has two measurements of each of these galaxies; I used a simple mean.

Examination of the table shows that Javelle's positions so reduced are systematically offset in both RA and Dec by a few arcsec.  However, they are more than good enough to unambiguously identify the CGCG galaxies.  In addition, Javelle's descriptions match what we see on the POSS, with one exception: IC 2374 "... near star 11.5".  There is no bright star near it.  Was this perhaps an asteroid?  (A supernova in galaxies this distant would have been around V = 17 or fainter, so can be confidently ruled out as a possibility.) Javelle does mention, however, the star just southeast of IC 2376 (this star is also in GSC).
― IC Notes by Harold Corwin  

Drawings, descriptions, and CCD photos are copyright Andrew Cooper unless otherwise noted, no usage without permission.

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