NGC 3310 is a starburst galaxy and it is likely that it collided with one of its satellite galaxies about 100 million years ago, triggering widespread star formation. The ring clusters of NGC 3310 have been undergoing starburst activity for at least the last 40 million years.
SN 1974C (type unknown, mag. 16.5) was discovered by Pieter van der Kruit and Halton Arp on 25 February 1974.
SN 1991N (TypeIb/c, mag. 15) was discovered by the Berkeley Automated Supernova Search on 29 March 1991 at an offset of 5″ east and 7″ south of the galactic nucleus.
SN 2021gmj (TypeII-P, mag. 15.1) was discovered by the Distance Less Than 40 Mpc Survey (DLT40) on 20 March 2021.
SN 2026sqf (TypeIa-CSM, mag. 12.9) was discovered by American amateur astronomer Patrick Wiggins on 8 July 2026. It had originally been classified as TypeII, but later analysis concluded it to be type Type Ia-CSM, the closest yet known of this kind. SN 2026sqf is part of the Unistellar "cosmic cataclysms" smart telescope tracking project.
Notes
↑Some sources incorrectly list the discovery date as 26 February 1974.
↑Schmidt, M.; van der Kruit, P. (28 February 1974). Marsden, Brian G. (ed.). "SUPERNOVAE". Central Bureau Electronic Telegrams (2641). Smithsonian Astrophysical Observatory, IAU: 1. Retrieved 4 August 2025.
↑"SN 1974C". Transient Name Server. IAU. Retrieved 3 December 2024.