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NGC 3938

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NGC 3938
Observation data (J2000 epoch)
ConstellationUrsa Major[1]
Right ascension11h 52m 42.9s[1]
Declination+44° 07′ 17″[1]
Distance43 Mly
Apparent magnitude (V)10.9[1]
Characteristics
TypeSA(s)c
Apparent size (V)5′.4 × 4′.9[1]

NGC 3938 is an unbarred spiral galaxy in the Ursa Major constellation. It was discovered on 6 February 1788 by William Herschel. It is one of the brightest spiral galaxies in the Ursa Major South galaxy group and is roughly 67,000 light years in diameter.[2] It is approximately 43 million light years away from Earth.[1] NGC 3938 is classified as type Sc under the Hubble sequence, a loosely wound spiral galaxy with a smaller and dimmer bulge.[3] The spiral arms of the galaxy contain many areas of ionized atomic hydrogen gas, more so towards the center.[4]

Supernovae

Two supernovae have been identified within NGC 3938. SN 2005ay is a type II supernova that was discovered on 27 March 2005 and had a magnitude of 15.6.[5] SN 2017ein is a type Ic supernova that was discovered on 25 May 2017 and peaked at magnitude 14.9.[6]

References

  1. ^ a b c d e f George Normandin (5 May 2005). "Spiral Galaxy NGC 3839". kopernik.org. Retrieved 30 December 2011.
  2. ^ "The Ursa Major Groups". Atlas of the Universe. Retrieved 30 December 2011.
  3. ^ van der Kruit, P.C.; Shostak, G.S. (1982). "Studies of Nearly Face-on Spiral Galaxies" (PDF). Astronomy and Astrophysics. 105: 351–358. Bibcode:1982A&A...105..351V. Retrieved 25 June 2014.
  4. ^ Jiménez-Vicente, J.; E. Battaner; M. Rozas; H. Castañeda; et al. (1999). "Fabry-Perot observations of the ionized gas in NGC 3938" (PDF). Astronomy and Astrophysics. 342: 417–425. arXiv:astro-ph/9811391. Bibcode:1999A&A...342..417J.
  5. ^ "Supernova 2005ay in NGC 3938". Rochester Astronomy. Retrieved 29 January 2013.
  6. ^ "Supernovae 2017ein in NGC 3938". www.rochesterastronomy.org. Retrieved 29 June 2017.
  7. ^ "Artist's impression of progenitor star to a type Ic supernova". www.spacetelescope.org. Retrieved 20 November 2018.
  • Media related to NGC 3938 at Wikimedia Commons