| NGC 739 | |
| Epoch: | J2000.0 |
| Constellation Name: | Triangulum |
| Z: | 0.015104 |
| Dist Ly: | 193 Mly |
| Appmag B: | 15.00 |
| Appmag V: | 14.10 |
| Type: | S0-a |
| Size V: | 0.9 x 0.6 |
| Names: | PGC 7312, MCG +05-05-030 |
NGC 739 is a spiral galaxy approximately 193 million light-years away from Earth in the constellation of Triangulum.
NGC 739 was discovered by English astronomer Ralph Copeland on January 9, 1874. He was using the 72" telescope at Birr Castle in an observation of Arp 166, which is composed of two interacting galaxies NGC 750 and NGC 751. Copeland reported the wrong direction of the newly observed galaxy, but gave the correct orientation as PA 292° (WNW) and separation 524" (8.7'). Because of his error the derived position was in error and this was copied into the NGC Catalogue.
In 1913 American astronomer Heber Curtis noted there was nothing at that position and suggested MCG +05-05-030 was in fact NGC 739, based on Edward Crossley's photographs taken at Lick Observatory.