NGC 644
Galaxy in the constellation of Phoenix
From Wikipedia, the free encyclopedia
NGC 644 is a barred spiral galaxy in the constellation Phoenix in the southern sky. It is estimated to be 270 million light-years from the Milky Way and has a diameter of approximately 130,000 light-years.[4] Together with NGC 641, it probably forms a gravitationally bound pair of galaxies. The object was discovered on September 5, 1834 by John Herschel.[5][6]
Right ascension01h 38m 52.975s[1]
Declination−42° 35′ 07.19″[1]
| NGC 644 | |
|---|---|
DECam image of NGC 644 | |
| Observation data (J2000 epoch) | |
| Constellation | Phoenix |
| Right ascension | 01h 38m 52.975s[1] |
| Declination | −42° 35′ 07.19″[1] |
| Redshift | 0.020731[2] |
| Heliocentric radial velocity | 6151 km/s[2] |
| Distance | 268.8 Mly (82.41 Mpc)[3] |
| Apparent magnitude (B) | 14.79[2] |
| Characteristics | |
| Type | SB(r)bc:[4] |
| Size | 126.8 kly (38.88 kpc)[4] |
| Other designations | |
| MCG -07-04-027, PGC 6097[2] | |
Two supernovae have been observed in NGC 644: SN 2011gm (type Ia, mag. 15.8),[7] and SN 2018cmj (type II, mag. 17.1).[8]
