| NGC 7721 | |
|---|---|
 A Sloan Digital Sky Survey (SDSS) image of 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 Mpc) [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]
