Wilhelm Tempel discovered the trio of NGC 4820, 4823 and 4829 in 1882, just south of NGC 4825. In Tempel's list V (AN #2439), he only mentions "three more faint nebulae south of 3320 NGC 4825]" found with the 11" refractor at Arcetri and no positions are given. The NGC position (probably communicated directly to Dreyer) for NGC 4820 matches MCG -02-33-067, and the position for NGC 4829 matches PGC 44299.

The position for NGC 4823, though, is close southwest of NGC 4820 and must be erroneous. Harold Corwin assigns NGC 4823 = PGC 44305, which is 18 sec of RA east and 1'-2' south of the NGC position.

The PGC reverses the identifications of NGC 4829 and 4823. RNGC misclassifies NGC 4823 as nonexistent and misidentifies NGC 4823 as NGC 4829. See my RNGC Corrections #5 and Harold Corwin's identification notes.

400/500mm - 17.5" (5/17/90): not found.

600/800mm - 24" (5/25/14): extremely or very faint, small, elongated 3:1 N-S, 20"x6", low even surface brightness. Located 3.8' SE of NGC 4825. NGC 4829 lies 2.4' S. Observed at 27° elevation (nearly 3 hrs past the meridian).

Notes by Steve Gottlieb