In astronomy, Calvera (also known as 1RXS J141256.0+792204[4]) is an X-ray source in the constellation Ursa Minor, identified in 2007 as an isolated neutron star. [5][6] It is one of the hottest [7] and closest of its kind to Earth.

Located in the constellation Ursa Minor, and nicknamed Calvera after the villain in the movie "The Magnificent Seven", the new discovery will be only the eighth known "isolated neutron star", if confirmed, and the closest.

Aug 20, 2007 · Astronomersusing NASA's Swift X-ray telescope have detected a neutron star within 250 to1,000 light-years of Earth, making it the closest neutron star ever known. The object,located in the...

Apr 2, 2025 · Calvera is a x-ray source located in the constellation of Ursa Minor, The Small Bear. It is not part of the Ursa Minor constellation outline but is within the borders of the constellation.

Aug 21, 2007 · U sing NASA’s Swift satellite, McGill University and Penn State University astronomers have identified an object that is possibly the closest neutron star to Earth. The object, located in the...

Calvera (also known as 1RXS J141256.0+792204 or PSR J1412+7922) is a high Galactic latitude (b ∼ 37°) soft X-ray source, which was first discovered in the ROSAT All-Sky Survey and then ...

Calvera (1RXS J141256.0+792204) is an isolated neutron star detected only through its thermal X-ray emission. Its location at high Galactic latitude (b = +37°) is unusual if Calvera is a relatively young pulsar, as suggested by its spin period (59 ms) and period derivative (3.2 × 10 −15 s s −1).

Aug 20, 2007 · Calvera's location high above the plane of our Milky Way galaxy is also a mystery. The researchers believe the object is the remnant of a star that lived in our galaxy's starry disc before...

Aug 9, 2016 · Calvera is an unusual isolated neutron star with pure thermal X-ray spectrum typical for central compact objects in supernova remnants. On the other hand, its rotation period and spin-down rate are typical for ordinary rotation-powered pulsars.

Feb 23, 2018 · It is proposed here that Calvera is a low-mass strangeon star with an inactive magnetosphere and probably braked by the accretion flow. In this picture, Calvera and XDINSs, having similar radiative properties, can be understood as strangeon stars at different stages of …