NGC 3697 is a spiral galaxy in the constellation of Leo. It was discovered on 24 February 1827 by John Herschel. It was described as "extremely faint, very small, extended 90°" by John Louis Emil Dreyer, the compiler of the New General Catalogue. It is a member of HCG 53, a compact group of galaxies.
One supernova, SN 2020aavb (type Ia, mag. 16), was discovered in NGC 3697 on 23 November 2020.Transient Name Server entry for SN 2020aavb. Retrieved 24 March 2023.
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