In astronomy, Calvera (also known as 1RXS J141256.0+792204[3]) is an X-ray source in the constellation Ursa Minor, identified in 2007 as an isolated neutron star.[4][5] It is one of the hottest[6] and closest of its kind to Earth.[7]
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Ursa Minor |
| Right ascension | 14h 12m 55.867s[1] |
| Declination | +79° 22′ 03.895″[1] |
| Characteristics | |
| Evolutionary stage | Neutron star |
| Astrometry | |
| Distance | ≤2000[1] pc |
| Details[1] | |
| Rotation | 59.199071070 ms |
| Age | 285,000 years |
| Other designations | |
| Database references | |
| SIMBAD | data |
It is named after the villain in the 1960 film The Magnificent Seven, as it is the eighth such neutron star known within 500 parsecs of Earth, and the seven previously discovered isolated neutron stars are called 'The Magnificent Seven'.
There is a ring of radio emission almost a degree in diameter, offset about 4′.9 from Calvera itself, which is possibly its supernova remnant.[8]
References
edit- ^ a b c d Bogdanov, Slavko; et al. (28 May 2019). "Neutron Star Interior Composition Explorer X-Ray Timing of the Radio and γ-Ray Quiet Pulsars PSR J1412+7922 and PSR J1849-0001". The Astrophysical Journal. 877 (2): 69. arXiv:1902.00144. Bibcode:2019ApJ...877...69B. doi:10.3847/1538-4357/ab1b2e. S2CID 119337118.
- ^ "RX J1412.9+7922". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 20 September 2020.
- ^ In the ROSAT All-Sky Survey Bright Source Catalog (RASS/BSC).
- ^ "Rare dead star found near Earth". August 20, 2007. Archived from the original on July 13, 2014. Retrieved August 21, 2007.
- ^ Rutledge, R. E.; Fox, D. B.; Shevchuk, A. H. (2008-01-01). "Discovery of an Isolated Compact Object at High Galactic Latitude". The Astrophysical Journal. 672 (2): 1137–1143. arXiv:0705.1011. Bibcode:2008ApJ...672.1137R. doi:10.1086/522667. ISSN 0004-637X.
- ^ Shevchuk, Andrew S. H.; Fox, Derek B.; Rutledge, Robert E. (2009-11-01). "Chandra Observations of 1RXS J141256.0+792204 (Calvera)". The Astrophysical Journal. 705 (1): 391–397. arXiv:0907.4352. Bibcode:2009ApJ...705..391S. doi:10.1088/0004-637X/705/1/391. ISSN 0004-637X. S2CID 10807335.
- ^ Rutledge, Robert; Fox, Derek; Shevchuk, Andrew (2008). "Discovery of an Isolated Compact Object at High Galactic Latitude". The Astrophysical Journal. 672 (2): 1137–43. arXiv:0705.1011. Bibcode:2008ApJ...672.1137R. doi:10.1086/522667. S2CID 7915388.
- ^ Arias, M.; Botteon, A.; Bassa, C. G.; Van Der Jagt, S.; Van Weeren, R. J.; o'Sullivan, S. P.; Bosschaart, Q.; Dullaart, R. S.; Hardcastle, M. J.; Hessels, J. W. T.; Shimwell, T.; Slob, M. M.; Sturm, J. A.; Tasse, C.; Theijssen, N. C. M. A.; Vink, J. (2022). "Possible discovery of Calvera's supernova remnant". Astronomy & Astrophysics. 667: A71. arXiv:2207.14141. Bibcode:2022A&A...667A..71A. doi:10.1051/0004-6361/202244369. S2CID 251135361.
External links
edit- Universe Today, Closest Neutron Star Discovered
- Pennsylvania State University. "Possible closest neutron star to Earth found" (Press release). August 20, 2007. Retrieved August 21, 2007.[permanent dead link]
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