NGC 819


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

Discovery

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

Supernovae

Three supernovae have been observed in NGC 819:SN 2007hb was discovered by Nearby Supernova Factory on August 24, 2007. SN 2007hb had a magnitude of about 19.5 and was located at RA 02h08m34.0s, DEC +29d14m14s, J2000.0. It was classified as a Type Ib/c supernova.SN 2016hkn was discovered by Fabio Briganti on October 22, 2016. SN 2014bu had a magnitude of about 17.2 and was located at RA 02h08m34.2s, DEC +29d14m11s, J2000.0. It was classified as a Type II supernova.SN 2020mbe was discovered by Gaia Photometric Science Alerts on January 10, 2020.