NGC 7721 | |
---|---|
Observation data ( J2000 epoch) | |
Constellation | Aquarius |
Right ascension | 23h 38m 48.65s [1] |
Declination | −06° 31′ 04.30″ [1] |
Redshift | 0.006728 ± 2.00e-6 [1] |
Distance | 79 Mly (24.47 M pc) [1] |
Apparent magnitude (V) | 11.6 [1] |
Characteristics | |
Type | SA(s)c [1] |
Size | 70,000 ly [1] |
Apparent size (V) | Unknown |
Notable features | N/A |
Other designations | |
PGC 72001, [1] AGC 630233, [1] IRAS 23362-0647, [1] LEDA 72001 [1] |
NGC 7721 is a spiral galaxy located around 79 million light-years away in the constellation Aquarius. [1] [2] NGC 7721 was discovered on September 10, 1785, by the astronomer William Herschel, and its diameter is 70,000 light-years across. [1] NGC 7721 is not known to have much star formation, and it is not known to have an active galactic nucleus. [1] [3] A supernova was observed in NGC 7721 in 2007, named 2007le. [4]