NGC 5857

NGC5857 is a barred spiral galaxy in the constellation of Boötes. Its velocity with respect to the cosmic microwave background for is, which corresponds to a Hubble distance of. In addition, 20 non-redshift measurements give a distance of. It was discovered by German-British astronomer William Herschel on 27 April 1788.
The SIMBAD database lists NGC5857 as a Seyfert II Galaxy, i.e. it has a quasar-like nucleus with very high surface brightnesses whose spectra reveal strong, high-ionisation emission lines, but unlike quasars, the host galaxy is clearly detectable.

NGC 5859 Group

According to A. M. Garcia, NGC 5857 is a member of the NGC 5859 galaxy group. This group has six members, including NGC 5859, UGC 9620, UGC 9622, UGC 9672, and UGC 9777.
Abraham Mahtessian mentions that NGC 5857 and NGC 5859 form a pair of galaxies and they are in gravitational interaction.

Supernovae

Two supernovae have been observed in NGC 5857:

SN1950H was discovered by Fritz Zwicky on 17 March 1950.
SN1955M was discovered by Fritz Zwicky on 14 May 1955.