Calvera (also known as 1RXS J141256.0+792204) is an X-ray source in the constellation Ursa Minor, identified in 2007 as an isolated neutron star. It is one of the hottest and closest of its kind to Earth. 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'. The name Calvera was officially added to the IAU Catalog of Star Names on 18 April 2026. There is a ring of radio emission almost a degree in diameter, offset about 4′.9 from Calvera itself; it is very likely its supernova remnant.
References
External links 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.{{cite press release}}: CS1 maint: deprecated archival service (link)