NGC 644 | |
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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] |
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]
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]
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] |
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]
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]