NGC 6946

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NGC 6946
NGC 6946.jpg
Spiral Galaxy NGC 6946
Observation data (J2000 epoch)
Constellation Cepheus & Cygnus
Right ascension 20h 34m 52.3s[1]
Declination +60° 09′ 14″[1]
Redshift 0.000160[1]
Helio radial velocity 48 ± 2 km/s[1]
Distance 22.5 ± 7.8 Mly
(6.9 ± 2.4 Mpc)[2]
Type SAB(rs)cd[1]
Apparent dimensions (V) 11.5 x 9.8 arcmin[1]
Apparent magnitude (V) +9.6[1]
Other designations
UGC 11597, PGC 65001, Arp 29,[1] Caldwell 12
See also: Galaxy, List of galaxies

NGC 6946, (also known as the Fireworks Galaxy, Arp 29, and Caldwell 12), is an intermediate spiral galaxy about 18 million light-years away,[2] in the constellations Cepheus and Cygnus. It was discovered by William Herschel on September 9, 1798. NGC 6946 is highly obscured by interstellar matter of the Milky Way galaxy, as it is quite close to the galactic plane. The diameter of the galaxy is approximately 40,000 light-years or just about a third of the size of the Milky Way.[3]


Nine supernovae (SN 1917A, SN 1939C, SN 1948B, SN 1968D, SN 1969P, SN 1980K, SN 2002hh, SN 2004et, and SN 2008S) in the last 60 years or so, have been observed in NGC 6946.[4]


  1. ^ a b c d e f g h "NASA/IPAC Extragalactic Database". Results for NGC 6946. Retrieved 2006-11-18. 
  2. ^ a b "Distance Results for NGC 6946". NASA/IPAC Extragalactic Database. Retrieved 2010-06-18. 
  3. ^ "Fireworks Galaxy NGC 6946". Astronomy Picture of the Day. 1 January 2011. 
  4. ^ "List of Supernovae". Harvard-Smithsonian Center for Astrophysics (IAU). Retrieved 2010-07-12. 

External links[edit]

Coordinates: Sky map 20h 34m 52.3s, +60° 09′ 14″