Astronomy:NGC 991

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NGC 991
File:250px
SDSS image of NGC 991
Observation data (J2000 epoch)
ConstellationCetus
Right ascension 02h 35m 32.68341s[1]
Declination−07° 09′ 15.8406″[1]
Redshift0.005126[2]
Helio radial velocity1532.8 km/s[2]
Distance62.9 ± 4.5 Mly (19.28 ± 1.37 Mpc)[3]
Apparent magnitude (B)12.36[2]
Characteristics
TypeSAB(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

References

  1. ↑ 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. ↑ 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. ↑ 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. 
  4. ↑ "Your NED Search Results". http://ned.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=NGC%20991. 
  5. ↑ "Revised NGC Data for NGC 991". http://spider.seds.org/ngc/revngcic.cgi?NGC991. 
  6. ↑ Ford, Dominic. "The galaxy NGC 991 - In-The-Sky.org" (in en). https://in-the-sky.org/data/object.php?id=NGC991. 
  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". IAU. https://www.wis-tns.org/object/1984L. 
  9. ↑ 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. 




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