NGC 1309
| NGC 1309 | |
|---|---|
 NGC 1309 imaged by the Hubble Space Telescope | |
| Observation data (J2000.0 epoch) | |
| Constellation | Eridanus |
| Right ascension | 03h 22m 06.5966s [1] |
| Declination | −15° 23′ 59.882″ [1] |
| Redshift | 0.007125[1] |
| Heliocentric radial velocity | 2136 ± 4 km/s[1] |
| Distance | 120 Mly (36 Mpc) [2] |
| Apparent magnitude (V) | 12.0 [1] |
| Characteristics | |
| Type | SA(s)bc [1] |
| Size | ~66,700 ly (20.46 kpc) (estimated)[1] |
| Apparent size (V) | 2.2 x 2.0 arcmin[1] |
| Other designations | |
| IRAS 03197-1534, MCG -03-09-028, PGC 12626[1] | |
NGC 1309 is a spiral galaxy located approximately 120 million light-years away, appearing in the constellation Eridanus. It was discovered by German-British astronomer William Herschel on 3 October 1785.[3]
NGC 1309 is about 75,000 light-years across, and is about 3/4s the width of the Milky Way. Its shape is classified as SA(s)bc, meaning that it has moderately wound spiral arms and no ring. Bright blue areas of star formation can be seen in the spiral arms, while the yellowish central nucleus contains older-population stars. NGC 1309 is one of over 200 members of the Eridanus Group of galaxies.[4]
Supernova 2002fk
[edit]SN 2002fk was discovered jointly by Reiki Kushida of the Yatsugatake South Base Observatory, Nagano Prefecture, Japan; and Jun-jie Wang and Yu-Lei Qiu of the Beijing Astronomical Observatory on 17 Sept 2002.[5] When it was discovered it was magnitude ~15.0; it was estimated to have reached maximum magnitude of ~13.0 before fading away. It was a Type Ia supernova (i.e., the progenitor star was white dwarf). White dwarfs are older stars that have used up almost all of their main fuel (the lighter elements such as hydrogen and helium). SN 2002fk's spectra showed no indications of hydrogen, helium or carbon; instead ionized calcium, silicon, iron and nickel were found.[6]
Supernova 2012Z
[edit]
SN 2012Z was discovered jointly by Brad Cenko, Weidong Li, and Alex Filippenko using the Katzman Automatic Imaging Telescope on 29 January 2012 as part of the Lick Observatory Supernova Search.[8][9] The scientists have hypothesized that this is a type Iax supernova, and may have left behind a remnant zombie star. In February 2022 a study with new observations has confirmed that the star survived the explosion and is even brighter than before.[10][11]
See also
[edit]References
[edit]- ^ a b c d e f g h i "NASA/IPAC Extragalactic Database". Results for object NGC 1309. Retrieved 8 Dec 2008.
- ^ Riess, Adam (Jul 2007). "The Final SHOE; Completing a Rich Cepheid Field in NGC 1309". Hubble Space Telescope Proposal ID #11329 (Cycle 16): 11329. Bibcode:2007hst..prop11329R.
- ^ Seligman, Courtney. "New General Catalogue Objects: NGC 1309". Celestial Atlas. Retrieved 8 December 2024.
- ^ "Hubble Snaps Images of a Pinwheel-Shaped Galaxy". News Release: STScI-2006-07. NASA. Retrieved 8 Dec 2008.
- ^ Kushida, R.; Nakano, S.; Wang, J.; Qiu, Y. L.; Kushida, Y. (2002). "Supernova 2002fk in NGC 1309". International Astronomical Union Circular (7973): 2. Bibcode:2002IAUC.7973....2K.
- ^ Marion, G.H.; et al. (Jul 2003). "Near-Infrared Spectra of Type Ia Supernovae". The Astrophysical Journal. 591 (1): 316–333. arXiv:astro-ph/0306470. Bibcode:2003ApJ...591..316M. doi:10.1086/375290. S2CID 17925961.
- ^ "Supernova 2012Z in spiral galaxy NGC 1309, annotated". ESA/Hubble Press Release. Retrieved 8 August 2014.
- ^ Cenko, S. B.; Li, W.; Filippenko, A. V.; Brimacombe, J.; Meyer, S.; Emig, K.; Kaleida, C.; Mamajek, E. E.; Cohen, D. P.; Silverman, J. M.; Ganeshalingam, M. (2012). "Supernova 2012Z in NGC 1309 = PSN J03220535-1523156". Central Bureau Electronic Telegrams. 3014: 1. Bibcode:2012CBET.3014....1C.
- ^ "Possible Supernova PSN J03220535-1523156 in NGC 1309 Narrowfield R - Jan 31". Flickr.com. Retrieved 4 Feb 2013.
- ^ "The Star that Survived a Supernova". lco.global. Retrieved 2022-06-22.
- ^ McCully, Curtis; Jha, Saurabh W.; Scalzo, Richard A.; Howell, D. Andrew; Foley, Ryan J.; Zeng, Yaotian; Liu, Zheng-Wei; Hosseinzadeh, Griffin; Bildsten, Lars; Riess, Adam G.; Kirshner, Robert P. (2022-02-01). "Still Brighter than Pre-explosion, SN 2012Z Did Not Disappear: Comparing Hubble Space Telescope Observations a Decade Apart". The Astrophysical Journal. 925 (2): 138. arXiv:2106.04602. Bibcode:2022ApJ...925..138M. doi:10.3847/1538-4357/ac3bbd. ISSN 0004-637X.
External links
[edit]
Media related to NGC 1309 at Wikimedia Commons
