NGC 789 is a spiral galaxy in the constellation of Triangulum. Its velocity with respect to the cosmic microwave background is , which corresponds to a Hubble distance of . It was discovered by German astronomer Heinrich Louis d'Arrest on 24 August 1865.
NGC 789 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 777 group NGC 789 is a member of the NGC 777 Group (also known as LGG 42). There are 13 galaxies in the group, including NGC 750, NGC 751, , NGC 777, , and NGC 785.
Supernovae Two supernovae have been observed in NGC 789: SN 2004ad (type unknown, mag. 17.0) was discovered by British amateur astronomer Mark Armstrong on 1 March 2004. SN 2026ovz (TypeII, mag. 16.1125) was discovered by the Zwicky Transient Facility on 10 June 2026.
See also List of NGC objects (1–1000)
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