NGC 5875 is a spiral galaxy in the constellation of Boötes. Its velocity with respect to the cosmic microwave background is 3585 ± 6 km/s, which corresponds to a Hubble distance of 52.87 ± 3.70 Mpc (~173 million light-years). It was discovered by German-British astronomer William Herschel on 1 May 1788.
The SIMBAD database lists NGC 5875 as a Seyfert II Galaxy, i.e. it has a quasar-like nuclei with very high surface brightnesses whose spectra reveal strong, high-ionisation emission lines, but unlike quasars, the host galaxy is clearly detectable.
Supernovae
Two supernovae have been observed in NGC 5875:
- SN 2022oqm (Type Ic-pec, mag. 17.3) was discovered by the Zwicky Transient Facility on 11 July 2022. This supernova has been described as one of the brightest calcium-rich supernovae known.
- SN 2023ldh (Type IIn, mag. 20.7423) was discovered by the Zwicky Transient Facility on 28 May 2023.
