NGC 7331

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NGC 7331

Spiral Galaxy NGC 7331 in infrared by the SST
Observation data (J2000 epoch)
Constellation Pegasus
Right ascension 22h 37m 04.1s[1]
Declination +34° 24′ 56″[1]
Redshift 816 ± 1 km/s[1]
Distance 40 ± 3 Mly (12.2 ± 1.0 Mpc)[2]
Type SA(s)b[1]
Apparent dimensions (V) 10′.5 × 3′.7[1]
Apparent magnitude (V) +10.4[1]
Other designations
UGC 12113, PGC 69327[1]
See also: Galaxy, List of galaxies

NGC 7331 is a spiral galaxy about 40 million light-years away in the constellation Pegasus. It was discovered by William Herschel in 1784.[citation needed]

The galaxy is similar in size and structure to the galaxy we inhabit, and is often referred to as "the Milky Way's twin,"[3] although recent discoveries regarding the structure of the Milky Way may call this similarity into doubt.[4]

Contents

[edit] Supernova

SN 1959D, a Type IIL supernova,[5] is the only supernova that has been identified within NGC 7331.[1] The supernova was discovered by Milton Humason and H. S. Gates in a survey at Palomar Observatory.[6]

[edit] See also

  • M94 - another galaxy with a prominent starburst ring
  • NGC 1512 - another galaxy with a prominent starburst ring

[edit] References

  1. ^ a b c d e f g h NASA/IPAC Extragalactic Database. Results for NGC 7331. Retrieved on 2006-11-10.
  2. ^ Jensen, Joseph B.; Tonry, John L.; Barris, Brian J.; Thompson, Rodger I.; Liu, Michael C.; Rieke, Marcia J.; Ajhar, Edward A.; Blakeslee, John P. (February 2003). "Measuring Distances and Probing the Unresolved Stellar Populations of Galaxies Using Infrared Surface Brightness Fluctuations". Astrophysical Journal 583 (2): 712–726. doi:10.1086/345430. 
  3. ^ Seeing Double: Spitzer Captures Our Galaxy's Twin. Spitzer Space Telescope Newsroom. Spitzer Science Center (2004-06-28). Retrieved on 2008-04-24.
  4. ^ The Milky Way Has Only Two Spiral Arms (2008-06-03). Retrieved on 2008-06-04.
  5. ^ NASA/IPAC Extragalactic Database. Results for SN 1959D. Retrieved on 2006-11-10.
  6. ^ M. L. Humason, H. S. Gates (1960). "The 1959 Palomar Supernova Search". Publications of the Astronomical Society of the Pacific 72: 208–209. doi:10.1086/127513. 

[edit] External links


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