| NGC 644 | |
|---|---|
 DECam image of NGC 644 | |
| Observation data (J2000epoch) | |
| 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] | |
NGC 644 is abarred spiral galaxy in theconstellationPhoenix in the southern sky. It is estimated to be 270 millionlight-years from theMilky Way and has adiameter of approximately 130,000 light-years.[4] Together with NGC 641, it probably forms agravitationally bound pair of galaxies. The object was discovered on September 5, 1834 byJohn Herschel.[5][6]
Twosupernovae have been observed in NGC 644: SN 2011gm (type Ia, mag. 15.8),[7] and SN 2018cmj (type II, mag. 17.1).[8]
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