NGC 819

NGC 819 is a spiral galaxy approximately 302 million light-years away from Earth in the constellation of Triangulum.^[1][3] It forms a visual pair with the galaxy NGC 816 5.7' WNW.^[4]

NGC 819
NGC 819 (SDSS)
Observation data (J2000.0 epoch)
Constellation	Triangulum
Right ascension	02h 08m 34.40s [1]
Declination	+29° 14′ 03.00″ [1]
Redshift	0.021935 [1]
Heliocentric radial velocity	6576 ± 10 km/s [1]
Distance	302 Mly
Apparent magnitude (V)	13.40 [2]
Apparent magnitude (B)	14.30 [2]
Characteristics
Type	S? [1]
Apparent size (V)	0.6 x 0.4 [2]
Other designations
IRAS 02056+2859, UGC 1632, PGC 8174, CGCG 504-017

Discovery

NGC 819 was discovered by German astronomer Heinrich Louis d'Arrest on September 20, 1865 with the 11-inch refractor at Copenhagen.^[4] Édouard Stephan independently found the galaxy again on September 15, 1871 with the 31" reflector at Marseille Observatory.^[4]

Supernovae

Three supernovae have been observed in NGC 819:

• SN 2007hb was discovered by Nearby Supernova Factory on August 24, 2007.^[5] SN 2007hb had a magnitude of about 19.5 and was located at RA 02h08m34.0s, DEC +29d14m14s, J2000.0.^[5][1] It was classified as a Type Ib/c supernova.^[5]
• SN 2016hkn was discovered by Fabio Briganti on October 22, 2016.^[6] SN 2014bu had a magnitude of about 17.2 and was located at RA 02h08m34.2s, DEC +29d14m11s, J2000.0.^[6][1] It was classified as a Type II supernova.^[6]
• SN 2020mbe (Type Ic, mag. 18.6) was discovered by Gaia Photometric Science Alerts on January 10, 2020.^[7]

See also

• List of NGC objects (1–1000)