Harold Corwin

NGC 4893 = IC 4015 and IC 4016, an interacting system. Neither d'A nor Lord Rosse saw both objects here, though Dreyer himself described the object as "F, irr R, E ns, rr" with Lord Rosse's 72-inch telescope -- he must have suspected that more was going on here than just a single galaxy. Both Dreyer and d'A mentioned the two nearby stars. Curiously, Dreyer adopted d'A's estimates of the stars magnitudes in preference to his own: Dreyer called them 11-12 and 14, while d'A has 17 and 20.

The fainter galaxy is often called "NGC 4893A" while the simple NGC number is assigned to the brighter northen galaxy. It's not clear from the original observations that this was the intent, so I've called the two galaxies components of the NGC object.

The NGC position (from d'A's single observation) is far enough off the galaxies that Wolf, in his fifth list, assigned the NGC number to a plate defect.

― NGC Notes by Harold Corwin

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

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