Astronomy:NGC 991
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Short description: Intermediate spiral galaxy in the constellation Cetus
| 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] |
| Helio 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]
References
- ↑ 1.0 1.1 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.
- ↑ 2.0 2.1 2.2 2.3 "NGC 991". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+991.
- ↑ 3.0 3.1 "Results for object NGC 0991 (NGC 991)". NASA/IPAC Extragalactic Database. California Institute of Technology. https://ned.ipac.caltech.edu/byname?objname=NGC%20991&hconst=67.8&omegam=0.308&omegav=0.692&wmap=4&corr_z=1.
- ↑ "Your NED Search Results". http://ned.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=NGC%20991.
- ↑ "Revised NGC Data for NGC 991". http://spider.seds.org/ngc/revngcic.cgi?NGC991.
- ↑ Ford, Dominic. "The galaxy NGC 991 - In-The-Sky.org" (in en). https://in-the-sky.org/data/object.php?id=NGC991.
- ↑ Wheeler, J. C.; Levreault, R. (July 1985). "The peculiar type I supernova in NGC 991". Astrophysical Journal 294: L17–L20. doi:10.1086/184500. Bibcode: 1985ApJ...294L..17W.
- ↑ Transient Name Server entry for SN 1984L. Retrieved 23 January 2024.
External links
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