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 (also known as LGG 394). This group has six members, including , UGC 9620, , , and .
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 (type unknown, mag. 17.6) was discovered by Fritz Zwicky on 17 March 1950. SN1955M (type unknown, mag. 14.5) was discovered by Fritz Zwicky on 14 May 1955.
See also List of NGC objects (5001–6000)
References
External links