Harold Corwin

IC 2193 is the first of five galaxies from among a group south of Castor first seen by Barnard in May of 1888. Barnard's positions, unfortunately, are not very good (mean offsets: -1.94 +- 1.03 seconds in RA; -2 arcmin 30 arcsec +- 38 arcsec in Dec), though he claims to have "carefully corrected" his telescope on Castor. His descriptions are also meager; this one merely reads, "Close p 10m star."

So, Dreyer questioned whether this object might be identical to IC 2192, one of Javelle's three galaxies from the group. I don't think so, even though this galaxy is much brighter and I was initially surprised that Javelle missed it. After a few seconds examining his table, however, it's clear that his sweep took him through the middle of the group, so he saw neither the northern-most nor southern-most galaxies of the group.

In any event, there is a star just northeast of the galaxy. I don't think it is close to 10th magnitude, but Barnard found this with a 12-inch refractor. So, it was probably easy to overestimate the brightness of a star near a fainter galaxy.

― 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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