NGC 3861 is a large barred spiral galaxy with a ring-like structure located about 310 million light-years away in the constellation Leo. It was discovered by astronomer John Herschel on March 23, 1827. NGC 3861 is a member of the Leo Cluster and has a normal amount of neutral hydrogen (H I) and ionised hydrogen (H II).
NGC 3861 is a low luminosity Type II Seyfert galaxy. However, it is also classified as a LINER galaxy.
Supernovae Two supernovae have been observed in NGC 3861: SN 2014aa (Type Ia, mag. 15.7) was discovered by Ron Arbour on March 7, 2014. SN 2026ihi (TypeII, mag. 18.182) was discovered by ATLAS on April 4, 2026.
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