NGC 7331

on the lower right side NGC 7331 is the brightest galaxy in the field of a visual grouping known as the NGC 7331 Group of galaxies. In fact, the other members of the group, NGC 7335, NGC 7336, NGC 7337 and NGC 7340, lie far in the background at distances of approximately 300–350 million light years. All of the members of the NGC 7331 Group, along with NGC 7325, NGC 7326, NGC 7327, NGC 7333, NGC 7338, are listed together as Holm 795 in Erik Holmberg's A Study of Double and Multiple Galaxies Together with Inquiries into some General Metagalactic Problems, published in 1937. ==Supernovae==

Four supernovae have been observed in NGC 7331: • SN 1959D (Type II-L, mag. 13.4) was discovered by Milton Humason and Howard S. Gates in a survey at Palomar Observatory on 28 June 1959. • SN 2013bu (Type II, mag. 16.6) was discovered by Kōichi Itagaki on 21 April 2013. • SN 2014C was discovered by the Lick Observatory Supernova Search (LOSS) on 5 January 2014. The supernova underwent an unusual "metamorphosis" from a hydrogen-poor Type Ib to a hydrogen-rich Type IIn over the course of a year. • SN 2025rbs (TypeIa, mag. 17.07) was discovered by GOTO on 14 July 2025. It got as bright as magnitude 11.9, making it the brightest supernova of 2025. By the end of August 2025, the supernova was still around magnitude 14.4. • In addition to the confirmed supernovae, a 1903 photographic plate from Yerkes Observatory shows a magnitude 16.6 candidate transient that may have also been a supernova. PIA21088 - Supernova SN 2014C (Optical and X-Ray).jpg|left|Image of SN 2014C. The inset images are from NASA's Chandra X-ray Observatory, showing a small region of the galaxy before the supernova (left) and after it (right). SN2025rbs NIR.jpg|Amateur near-infrared image of SN 2025rbs (marked by red crosshairs) SN2025rbs-NGC7331-18Aug2025-SVAS.jpg|SN 2025rbs imaged on 18 August 2025 __NOTOC__ ==See also==