NGC 3733 has a possible active galactic nucleus, i.e. it has a compact region at the center of a galaxy that emits a significant amount of energy across the electromagnetic spectrum, with characteristics indicating that this luminosity is not produced by the stars.[5][6]
SN 1980D (TypeII, mag. 15) was discovered by Swiss Astronomer Paul Wild on 17 March 1980.[9][10] It was initially classified as Type I,[11] but later analysis concluded it was more likely of Type II.[12][13]
↑Garcia, A. M. (1993). "General study of group membership. II. Determination of nearby groups". Astronomy and Astrophysics Supplement Series. 100: 47. Bibcode:1993A&AS..100...47G.
