NGC 582 is a barred spiral galaxy in the constellation of Triangulum. Its velocity with respect to the cosmic microwave background is , which corresponds to a Hubble distance of . Additionally, 25 non-redshift measurements give a similar mean distance of . It was discovered by German astronomer Heinrich Louis d'Arrest on 9 August 1863.
NGC 582 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.
NGC 499 group NGC 582 is a member of the NGC 499 Group (also known as LGG 24). There are six galaxies in the group, including NGC 495, NGC 499, NGC 504, NGC 517, and .
Supernovae Two supernovae have been observed in NGC 582: SN 2015cz (TypeII-P, mag. 16.5) was discovered by Jiaming Liao, Guoyou Sun, and Xing Gao on 2 October 2015. SN 2020lkb (TypeII, mag. 17.2) was discovered by Kōichi Itagaki on 30 May 2020.
See also List of NGC objects (1–1000)
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