Calvera (X-ray source)

In astronomy, Calvera is a nickname —based on the villain in the 1960 film The Magnificent Seven— of an X-ray source known as 1RXS J141256.0+792204 in the ROSAT All-Sky Survey Bright Source Catalog (RASS/BSC). It lies in the constellation Ursa Minor and is identified as an isolated neutron star.[3] It is one of the closest of its kind to Earth.[4]

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]
Evolutionary stage Neutron star
Distance≤2000[1] pc
Rotation59.199071070 ms
Age285,000 years
Other designations
PSR J1412+7922, RX J1412.9+7922, 1RXS J141256.0+792204[2]
Database references

The object is so-named because the seven previously known isolated neutron stars are known collectively as 'The Magnificent Seven'.


  1. ^ 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.
  2. ^ "RX J1412.9+7922". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 20 September 2020.
  3. ^ "Rare dead star found near Earth". August 20, 2007. Archived from the original on July 13, 2014. Retrieved August 21, 2007.
  4. ^ 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.

External linksEdit