astronomy Astronomy () is a natural science that studies astronomical object, celestial objects and phenomena. It uses mathematics, physics, and chemistry in order to explain their origin and chronology of the Universe, evolution. Objects of interest ...

, Calvera is a nickname —based on the villain in the 1960 film ''

The Magnificent Seven ''The Magnificent Seven'' is a 1960 American Western film directed by John Sturges. The screenplay by William Roberts is a remake – in an Old West–style – of Akira Kurosawa's 1954 Japanese film '' Seven Samurai'' (itself initially relea ...

''— of an X-ray source known as 1RXS J141256.0+792204 in the ''

ROSAT ROSAT (short for Röntgensatellit; in German X-rays are called Röntgenstrahlen, in honour of Wilhelm Röntgen) was a German Aerospace Center-led satellite X-ray telescope, with instruments built by West Germany, the United Kingdom and the Uni ...

All-Sky Survey Bright Source Catalog'' (RASS/BSC). It lies in the constellation

Ursa Minor Ursa Minor (Latin: 'Lesser Bear', contrasting with Ursa Major), also known as the Little Bear, is a constellation located in the far northern sky. As with the Great Bear, the tail of the Little Bear may also be seen as the handle of a ladle, h ...

and is identified as an isolated

neutron star A neutron star is the collapsed core of a massive supergiant star, which had a total mass of between 10 and 25 solar masses, possibly more if the star was especially metal-rich. Except for black holes and some hypothetical objects (e.g. white ...

. It is one of the closest of its kind to Earth. 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 A supernova remnant (SNR) is the structure resulting from the explosion of a star in a supernova. The supernova remnant is bounded by an expanding shock wave, and consists of ejected material expanding from the explosion, and the interstellar mat ...

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

References

External links

* Universe Today
Closest Neutron Star Discovered
*

Pennsylvania State University The Pennsylvania State University (Penn State or PSU) is a Public university, public Commonwealth System of Higher Education, state-related Land-grant university, land-grant research university with campuses and facilities throughout Pennsylvan ...

. Neutron stars Ursa Minor (constellation) ROSAT objects {{star-stub