Constellation Ursa Minor | ||
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Similar Delta Ursae Minoris, Gamma Ursae Minoris, WISE 1506+7027, Epsilon Ursae Minoris, Beta Ursae Minoris | ||
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. It is one of the closest of its kind to Earth.
References
Calvera (X-ray source) Wikipedia(Text) CC BY-SA