Guillaume Bigourdan discovered NGC 4876 = Big. 66, along with NGC 4875, on 16 May 1885. His Comptes Rendus position is 1' northeast of CGCG 160-232 = PGC 44640 (similar offset as NGC 4875).

300/350mm - 13.1" (4/29/84): extremely faint, very small, round. Located 4' SE of NGC 4874 in AGC 1656.

400/500mm - 17.5" (4/21/90): very faint, very small, elongated N-S. Located in the core of AGC 1656 3.4' SE of NGC 4874. Third of three with NGC 4875 1.5' WSW and IC 3973 3.4' SE.

Notes by Steve Gottlieb