NGC 991

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NGC 991
NGC991 - SDSS DR14.jpg
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]

Contents

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

Related Research Articles

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NGC 4639 is a barred spiral galaxy located in the equatorial constellation of Virgo. It was discovered by German-born astronomer William Herschel on April 12, 1784. John L. E. Dreyer described it as "pretty bright, small, extended, mottled but not resolved, 12th magnitude star 1 arcmin to southeast". This is a relatively nearby galaxy, lying approximately 72 million light-years away from the Milky Way. It is a companion to NGC 4654, and the two appear to have interacted roughly 500 million years ago. NGC 4639 is a member of the Virgo Cluster.

<span class="mw-page-title-main">NGC 3021</span> Galaxy in the constellation Leo Minor

NGC 3021 is a spiral galaxy in the northern constellation of Leo Minor. It is about 93 million light-years away from Earth, and is receding with a heliocentric radial velocity of 1,537±4 km/s. This galaxy was discovered December 7, 1785 by Anglo-German astronomer William Herschel. The morphological classification of NGC 3021 is SA(rs)bc, which indicates a spiral galaxy with no central bar (SA), an incomplete inner ring structure (rs), and moderate to loosely wound spiral arms (bc).

<span class="mw-page-title-main">NGC 3336</span> Galaxy in the constellation Hydra

NGC 3336 is a barred spiral galaxy located about 190 million light-years away in the constellation Hydra. It was discovered by astronomer John Herschel on March 24, 1835. NGC 3336 is a member of the Hydra Cluster.

<span class="mw-page-title-main">NGC 1259</span> Galaxy in the constellation Perseus

NGC 1259 is a lenticular galaxy located about 243 million light-years away in the constellation Perseus. The galaxy was discovered by astronomer Guillaume Bigourdan on October 21, 1884 and is a member of the Perseus Cluster.

<span class="mw-page-title-main">NGC 1268</span> Spiral galaxy in the constellation Perseus

NGC 1268 is a spiral galaxy located about 140 million light-years away in the constellation Perseus. It was discovered by astronomer Heinrich d'Arrest on February 14, 1863. NGC 1268 is a member of the Perseus Cluster and appears to show signs of distortion in the form of bridges. These features may be the result of a strong interaction with NGC 1267.

<span class="mw-page-title-main">NGC 1278</span> Galaxy in the constellation Perseus

NGC 1278 is an elliptical galaxy located about 230 million light-years away in the constellation Perseus. NGC 1278 was discovered by astronomer Heinrich d'Arrest on February 14, 1863. It was then rediscovered by astronomer Guillaume Bigourdan on October 22, 1884 and was later listed as IC 1907. NGC 1278 is a member of the Perseus Cluster and is a low-luminosity AGN (LLAGN).

<span class="mw-page-title-main">NGC 1282</span> Galaxy in the constellation Perseus

NGC 1282 is an elliptical galaxy located about 230 million light-years away in the constellation Perseus. It was discovered by astronomer Guillaume Bigourdan on October 23, 1884. NGC 1282 is a member of the Perseus Cluster.

<span class="mw-page-title-main">NGC 3861</span> Galaxy in the constellation Leo

NGC 3861 is a large barred spiral galaxy with a ring-like structure located about 310 million light-years away in the constellation Leo. It was discovered by astronomer John Herschel on March 23, 1827. NGC 3861 is a member of the Leo Cluster and has a normal amount of neutral hydrogen and ionised hydrogen.

<span class="mw-page-title-main">NGC 3294</span> Galaxy in the constellation Leo Minor

NGC 3294 is a spiral galaxy in the constellation Leo Minor. It was discovered by William Herschel on Mar 17, 1787. It is a member of the Leo II Groups, a series of galaxies and galaxy clusters strung out from the right edge of the Virgo Supercluster. The galaxy is located at a distance of 98 million light years and is receding with a heliocentric radial velocity of 1,586 km/s. The morphological class of NGC 3294 is SA(rs)bc, which means this is a spiral galaxy with no central bar (SA), an incomplete inner ring structure (rs), and moderately wound spiral arms (bc).

<span class="mw-page-title-main">NGC 918</span> Barred spiral galaxy in the constellation Aries

NGC 918 is a barred spiral galaxy in the constellation Aries, about 67 million light years from the Milky Way. It was discovered by John Herschel on Jan 11, 1831.

<span class="mw-page-title-main">NGC 4316</span> Spiral galaxy in the constellation Virgo

NGC 4316 is an edge-on spiral galaxy located about 70 million light-years away in the constellation Virgo. It was discovered by astronomer Wilhelm Tempel on March 17, 1882. NGC 4316 is a member of the Virgo Cluster and is classified as LINER and as a Seyfert galaxy.

<span class="mw-page-title-main">NGC 570</span> Galaxy in the constellation Cetus

NGC 570 is a barred spiral galaxy. It is located in the Cetus constellation about 250 million light-years from the Milky Way. It was discovered by the American astronomer George Mary Searle in 1867.

<span class="mw-page-title-main">NGC 820</span> Spiral galaxy in the constellation Aries

NGC 820 is a spiral galaxy located in the constellation Aries about 210 million light-years from the Milky Way. It was discovered by British astronomer John Herschel in 1828.

<span class="mw-page-title-main">NGC 940</span> Galaxy in the constellation Triangulum

NGC 940 is a lenticular galaxy in the constellation Triangulum. It is estimated to be 222 million light-years from the Milky Way and has a diameter of approximately 80,000 ly. NGC 940 was discovered by Heinrich d'Arrest.

<span class="mw-page-title-main">NGC 550</span> Spiral galaxy in the constellation Cetus

NGC 550 is a spiral galaxy in the constellation Cetus. It is estimated to be about 300 million light-years from the Milky Way and has a diameter of approximately 110,000 light years. The German-British astronomer William Herschel discovered it on 8 October 1785.

<span class="mw-page-title-main">NGC 782</span> Galaxy in the constellation Eridanus

NGC 782 is a barred spiral galaxy located in the constellation Eridanus about 160 million light-years from the Milky Way. It was discovered by British astronomer John Herschel in 1834.

<span class="mw-page-title-main">NGC 996</span> Galaxy in the constellation Andromeda

NGC 996 is an elliptical galaxy of the Hubble type E0 in the constellation Andromeda. It is estimated to be 210 million light years from the Milky Way and has a diameter of approximately 75,000 ly. The supernova SN 1996bq occurred in this galaxy. NGC 996 was discovered on December 7, 1871 by astronomer Édouard Stephan.

<span class="mw-page-title-main">NGC 938</span> Galaxy in the constellation Aries

NGC 938 is an elliptical galaxy located in the constellation Aries, approximately 184 million light years from the Milky Way. It was discovered by the Prussian astronomer Heinrich d'Arrest in 1863.

<span class="mw-page-title-main">NGC 706</span> Galaxy in the constellation Pisces

NGC 706 is a spiral galaxy located in the Pisces constellation about 230 million light years from the Milky Way. It was discovered by the German–British astronomer William Herschel in 1786.

<span class="mw-page-title-main">NGC 823</span> Galaxy in the constellation Fornax

NGC 823, also known as IC 1782, is an unbarred lenticular galaxy in the constellation Fornax. It is estimated to be 194 million light-years from the Milky Way and has a diameter of approximately 100,000 light years. NGC 823 was discovered on October 14, 1830, by astronomer John Herschel.

References

  1. 1 2 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. 1 2 3 4 "NGC 991". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2020-06-03.
  3. 1 2 "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.


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