| NGC 739 | |
|---|---|
 NGC 739 (SDSS) | |
| Observation data (J2000.0epoch) | |
| Constellation | Triangulum |
| Right ascension | 01h 56m 54.70s[1] |
| Declination | +33° 16′ 00.00″[1] |
| Redshift | 0.015104[1] |
| Heliocentric radial velocity | 4528 ± 34km/s[1] |
| Distance | 193 Mly |
| Apparent magnitude (V) | 14.10[2] |
| Apparent magnitude (B) | 15.00[2] |
| Characteristics | |
| Type | S0-a[2] |
| Apparent size (V) | 0.9 x 0.6[2] |
| Other designations | |
| PGC 7312,MCG +05-05-030 | |
NGC 739 is aspiral galaxy approximately193 millionlight-years away from Earth in theconstellation ofTriangulum.[1][3]
NGC 739 was discovered by English astronomerRalph Copeland on January 9, 1874.[4] He was using the 72" telescope atBirr Castle in an observation ofArp 166, which is composed of two interacting galaxiesNGC 750 andNGC 751.[4][5] Copeland reported the wrong direction of the newly observed galaxy, but gave the correct orientation as PA 292° (WNW) and separation 524" (8.7').[4] Because of his error the derived position was in error and this was copied into theNGC Catalogue.[4]
In 1913 American astronomerHeber Curtis noted there was nothing at that position and suggested MCG +05-05-030 was in fact NGC 739, based onEdward Crossley's photographs taken atLick Observatory.[4]
