| 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]
- ^ a b c d e f g h i j k l m n "By Name | NASA/IPAC Extragalactic Database". ned.ipac.caltech.edu. Retrieved 2024-04-13.
- ^ "NGC 7721 - Spiral Galaxy in Aquarius | TheSkyLive.com". theskylive.com. Retrieved 2024-04-13.
- ^ "New General Catalog Objects: NGC 7700 - 7749". cseligman.com. Retrieved 2024-04-13.
- ^ Johansson, J.; Goobar, A.; Kasliwal, M. M.; Helou, G.; Masci, F.; Tinyanont, S.; Jencson, J.; Cao, Y.; Fox, O. D.; Kromer, M.; Amanullah, R.; Banerjee, D. P. K.; Joshi, V.; Jerkstrand, A.; Kankare, E.; Prince, T. A. (7 January 2017). "Spitzer observations of SN 2014J and properties of mid-IR emission in Type Ia supernovae". Monthly Notices of the Royal Astronomical Society. 466 (3): 3442–3449. arXiv:1411.3332. doi:10.1093/mnras/stw3350. Retrieved 14 April 2024.