| NGC 991 | |
|---|---|
 SDSS image of NGC 991 | |
| Observation data (J2000 epoch) | |
| Constellation | Cetus |
| Right ascension | 02h 35m 32.68341s[1] |
| Declination | −07° 09′ 15.8406″[1] |
| Redshift | 0.005126[2] |
| Heliocentric radial velocity | 1532.8 km/s[2] |
| Distance | 62.9 ± 4.5 Mly (19.28 ± 1.37 Mpc)[3] |
| Apparent magnitude (B) | 12.36[2] |
| Characteristics | |
| Type | SAB(rs)c[3] |
| Other designations | |
| MCG -01-07-023, PGC 9846[2] | |
NGC 991 is an intermediate spiral galaxy the constellation Cetus. This galaxy was discovered by astronomer William Herschel in 1785.[4][5][6]
A type Ib supernova designated SN 1984L was discovered in this galaxy in late August 1984 by R. Evans.[7] SN 1984L (type II, mag. 13.5),[8]
- ^ a b Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051.
- ^ a b c d "NGC 991". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-06-03.
- ^ a b "Results for object NGC 0991 (NGC 991)". NASA/IPAC Extragalactic Database. California Institute of Technology. Retrieved 2020-06-03.
- ^ "Your NED Search Results". ned.ipac.caltech.edu. Retrieved 2020-03-24.
- ^ "Revised NGC Data for NGC 991". spider.seds.org. Retrieved 2020-03-24.
- ^ Ford, Dominic. "The galaxy NGC 991 - In-The-Sky.org". in-the-sky.org. Retrieved 2020-03-24.
- ^ Wheeler, J. C.; Levreault, R. (July 1985). "The peculiar type I supernova in NGC 991". Astrophysical Journal. 294: L17–L20. Bibcode:1985ApJ...294L..17W. doi:10.1086/184500.
- ^ Transient Name Server entry for SN 1984L. Retrieved 23 January 2024.