Harold Corwin

IC 5378 and IC 5379. Found by Isaac Roberts on a plate of NGC 7814 taken with his 20-inch reflector, these two objects -- and the surrounding stars -- are clearly described by him. He measured positions with respect to NGC 7814, and lists them assuming that the NGC position is correct.

[IC 5378] 23 55 28, 74 09.4 [1860, north polar distance]. F, Ens, 1 of 3 sts 15 inv, cond at n end, length incl st 42 arcsec.

[IC 5379] 23 55 31, 74 11.8 [1860, NPD]. F, S, Epf, FN, star 17 close to p end.

The first description and position points exactly to an interacting pair as I5378. There are two 15th magnitude stars just preceding, and the nucleus of the southern galaxy is about the same magnitude and almost stellar. The fainter companion galaxy is just north of the brighter southern object, and on a small-scale plate, would almost certainly be mistaken for part of the brighter galaxy. The pair is Arp 130, and the 200-inch photo shown by Arp is very good indeed.

Similarly for IC 5379, the description and position are exactly matched by the galaxy just south-following the pair. Just as Roberts claims, this object has a faint star just preceding it, and is indeed extended nearly east-west.

In addition, the other two objects (IC 5377 and IC 5381) found on the same plate by Roberts are just where he places them, and the descriptions match. There is thus no question about the correct identifications for these two objects.

― 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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