Wilhelm Tempel discovered NGC 2633 = T VI-5 = T IX-6 on 11 Aug 1882, along with NGC 2634. His position (corrected in list IX) matches UGC 4574 = Arp 80 = PGC 24723.

300/350mm - 13.1" (1/11/86): fairly faint, small bright core with faint extensions slightly elongated N-S. Forms a pair with NGC 2634 8.2' S.

900/1200mm - 48" (3/1/19): Excellent, fairly large, two-armed barred spiral! The central part of the galaxy consists of a very prominent bar oriented ~3:1 NNW-SSE, with a very bright core. A striking spiral arm is attached at the south end of the bar. It bends sharply clockwise and extends north, on the east side of bar, arcing gently with a length of ~1.5'. This arm has a well defined inner and outer edge and is separated from the bar by a dark gap. As the arm extends north it fades but at the northern end bends sharply west [1.0' N of center] and noticeably brightens in an elongated piece [consisting of multiple HII regions on images]. At the north end of the bar a second arm emerges towards the west and starts to curl south, but fades and dims, reaching no further south than the center of the bar.

Notes by Steve Gottlieb