NGC 991

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]}

One supernova has been observed in NGC 991: SN 1984L (type Ib, mag. 14) was discovered by Robert Evans on 28 August 1984. ^{[7] [8] [9]}

See also

• List of NGC objects (1–1000)

References

1. 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 .
2. "NGC 991". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2020-06-03.
3. "Results for object NGC 0991 (NGC 991)". NASA/IPAC Extragalactic Database. California Institute of Technology. Retrieved 2020-06-03.
4. "Your NED Search Results". ned.ipac.caltech.edu. Retrieved 2020-03-24.
5. "Revised NGC Data for NGC 991". spider.seds.org. Retrieved 2020-03-24.
6. Ford, Dominic. "The galaxy NGC 991 - In-The-Sky.org". in-the-sky.org. Retrieved 2020-03-24.
7. Waagen, E.; Evans, R.; Cragg, T.; Dunbar, S.; Helin, E.; Barucci, M.; Swanson, S. (1984). "Supernova in NGC 991". International Astronomical Union Circular (3979): 1. Bibcode:1984IAUC.3979....1W.
8. "SN 1984L". Transient Name Server. IAU . Retrieved 5 December 2024.
9. 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.

External links

• Media related to NGC 991 at Wikimedia Commons