NGC 772

At around 200,000 light years in diameter, NGC 772 is somewhat larger than the Milky Way Galaxy, and is surrounded by several satellite galaxies – including the dwarf elliptical, NGC 770 – whose tidal forces on the larger galaxy have likely caused the emergence of a single elongated outer spiral arm that is much more developed and stronger than the other arms. Halton Arp includes NGC 772 in his Atlas of Peculiar Galaxies as Arp 78, where it is described as a "Spiral galaxy with a small high-surface brightness companion". NGC 772 probably has a H II nucleus, but it may be a transitional object. ==Supernovae==

Three supernovae have been observed in NGC 772: • SN 2003hl (Type II, mag. 16.5) was discovered by LOTOSS (Lick Observatory and Tenagra Observatory Supernova Searches) on 20 August 2003. • SN 2003iq (Type II, mag. 16.4) was discovered by Jean-Marie Llapasset on 8 October 2003. This supernova was visible at the same time as SN 2003hl, which had been discovered 7 weeks prior. • SN 2022qze (Type II-P, mag. 19.89) was discovered by Pan-STARRS on 8 August 2022. ==Gallery==

File:NGC 772 by Goran Nilsson & The Liverpool Telescope.jpg|RGB image of the galaxy NGC 772 and dwarf galaxy NGC 770 (top center) interacting, from the Liverpool Telescope File:NGC 772 A Rival to the Milky Way.jpg|Center of the galaxy imaged by the Hubble Space Telescope. ==See also==