NGC 309 is a spiral galaxy in the constellation Cetus. Its velocity with respect to the cosmic microwave background is 5343 ± 22 km/s, which corresponds to a Hubble distance of 257.0 ± 18.0 Mly (78.81 ± 5.53 Mpc).[1] However, nine non-redshift measurements give a much closer distance of 87.99 ± 10.45 Mly (26.978 ± 3.205 Mpc).[2] It was discovered in 1876 by Wilhelm Tempel.[3]
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.[4]
Supernovae
Five supernovae have been observed in NGC 309.
| Supernova | apmag | type | Discovery date |
|---|---|---|---|
| 1999ge[5] | 15.5 | II | 27 November 1999 |
| 2008cx[6] | 17.8 | IIb | 5 June 2008 |
| 2012dt[7] | 18.0 | IIP | 17 July 2012 |
| PSN J00564446-0954595[8] | 17.2 | IIb | 10 June 2013 |
| 2014ef[9][10] | 17.3 | Ib | 13 December 2014 |
See also
References
- ^ a b c d e f g h i j k "NASA/IPAC Extragalactic Database". Results for NGC 0309. Retrieved September 2, 2016.
- ^ "Distance Results for NGC 309". NASA/IPAC EXTRAGALACTIC DATABASE. NASA. Retrieved November 22, 2024.
- ^ "New General Catalog Objects: NGC 300 - 349". Cseligman. Retrieved October 20, 2016.
- ^ Holmberg, Erik (1937). "A Study of Double and Multiple Galaxies Together with Inquiries into some General Metagalactic Problems". Annals of the Observatory of Lund. 6: 1. Bibcode:1937AnLun...6....1H.
- ^ "SN 1999ge". Transient Name Server. IAU. Retrieved November 22, 2024.
- ^ "SN 2008cx". Transient Name Server. IAU. Retrieved November 22, 2024.
- ^ "SN 2012dt". Transient Name Server. IAU. Retrieved November 22, 2024.
- ^ Fox, Derek (June 17, 2013). "FIRE Classification of Supernova in NGC 309". The Astronomer's Telegram. Retrieved November 22, 2024.
- ^ 2014ef in NGC 309 (David Bishop)
- ^ "SN 2014ef". Transient Name Server. IAU. Retrieved November 22, 2024.
External links
Media related to NGC 309 at Wikimedia Commons
