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AstroNote 2020-126
SN 2020nvb
Sky & Telescope
The first of the pair, dubbed 2020nlb, was discovered by the Asteroid Terrestrial-impact Last Alert System (ATLAS) on June 25th in the 10th-magnitude galaxy M85. Located in Coma Berenices 60 million light-years from Earth, M85 is an elliptical galaxy a quarter again as large our Milky Way.
Japanese amateur and prolific supernova hunter Koichi Itagaki nabbed SN 2020nvb on July 1 in NGC 4457, a spiral galaxy in Virgo located about 55 million light-years away.
Each of these newly discovered supernovae occurred in a close binary system where a tiny, superdense white dwarf star orbits a normal star.
The M85 supernova quickly brightened from magnitude 16.8 at discovery to 12.2 on July 7 and may still be getting brighter. The NGC 4457 supernova is even brighter at magnitude 11.9 and located a little northwest of the center of the galaxy's nucleus.
SN 2020nvb
Sky & Telescope
The first of the pair, dubbed 2020nlb, was discovered by the Asteroid Terrestrial-impact Last Alert System (ATLAS) on June 25th in the 10th-magnitude galaxy M85. Located in Coma Berenices 60 million light-years from Earth, M85 is an elliptical galaxy a quarter again as large our Milky Way.
Japanese amateur and prolific supernova hunter Koichi Itagaki nabbed SN 2020nvb on July 1 in NGC 4457, a spiral galaxy in Virgo located about 55 million light-years away.
Each of these newly discovered supernovae occurred in a close binary system where a tiny, superdense white dwarf star orbits a normal star.
The M85 supernova quickly brightened from magnitude 16.8 at discovery to 12.2 on July 7 and may still be getting brighter. The NGC 4457 supernova is even brighter at magnitude 11.9 and located a little northwest of the center of the galaxy's nucleus.