NGC 309 is a spiral galaxy in the constellation Cetus. Its velocity with respect to the cosmic microwave background is 5343 ± 22km/s, which corresponds to a Hubble distance of . However, nine non-redshift measurements give a much closer distance of . It was discovered in 1876 by Wilhelm Tempel.
NGC 309 and NGC 309A are listed together as Holm 27 in Erik Holmberg's A Study of Double and Multiple Galaxies Together with Inquiries into some General Metagalactic Problems, published in 1937.
Supernovae
Five supernovae have been observed in NGC 309.
+Supernovae in NGC 309 Supernova apmag type Discovery date 1999ge 15.5 II 27 November 1999 2008cx 17.8 IIb 5 June 2008 2012dt 18.0 IIP 17 July 2012 PSN J00564446-0954595 17.2 IIb 10 June 2013 2014ef2014ef in NGC 309 (David Bishop) 17.3 Ib 13 December 2014
See also List of NGC objects (1–1000)
References
External links