NGC 6946

NGC 6946
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 22 million light-years away,^[2] on the border between 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. Nine supernovae (SN 1917A, SN 1939C, SN 1948B, SN 1968D, SN 1969P, SN 1980K, SN 2002hh, SN 2004et, and SN 2008S) have been observed in NGC 6946.^[3]

There is polarisation data within ranges 0.17-0.18 m and 0.21-0.23 m, observed in 2003 by WSRT.

References

1. ^ ^{a b c d e f g h} "NASA/IPAC Extragalactic Database". Results for NGC 6946. http://nedwww.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=NGC+6946&img_stamp=yes&extend=no. Retrieved 2006-11-18. 
2. ^ ^{a b} "Distance Results for NGC 6946". NASA/IPAC Extragalactic Database. http://nedwww.ipac.caltech.edu/cgi-bin/nDistance?name=NGC+6946. Retrieved 2010-06-18. 
3. ^ "List of Supernovae". Harvard-Smithsonian Center for Astrophysics (IAU). http://cbat.eps.harvard.edu/lists/Supernovae.html. Retrieved 2010-07-12. 

External links

• SEDS: Spiral Galaxy NGC 6946
• NGC6946
• Supernova 2008S in NGC 6946 (supernovae.net)
• NASA APOD – 2011 Jan 01
• NGC 6946 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images

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