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Luhman 16
Luhman 16 (WISE 1049−5319, WISE J104915.57−531906.1) is a binary brown-dwarf system in the southern constellation Vela at a distance of approximately from the Sun. These are the closest known brown dwarfs and the closest system found since the measurement of the proper motion of Barnard's Star in 1916, and the third-closest known system to the Sun (after the Alpha Centauri system and Barnard's Star). The primary is of spectral type L7.5 and the secondary of type (and is hence near the L–T transition). Luhman 16 A and B orbit each other at a distance of about 3 AU with an orbital period of approximately 25 years.
==Discovery==
The brown dwarfs were discovered by Kevin Luhman, astronomer from Pennsylvania State University and a researcher in Penn State's Center for Exoplanets and Habitable Worlds, from images made by the Wide-field Infrared Survey Explorer (WISE) Earth-orbiting satellite—NASA infrared-wavelength space telescope, a mission that lasted from December 2009 to February 2011; the discovery images were taken from January 2010 to January 2011, and the discovery was announced in 2013 (the pair are the only two objects announced in the discovery paper). The system was found by comparing WISE images at different epochs to reveal objects that have high proper motions.
Luhman 16 appears in the sky close to the galactic plane, which is densely populated by stars; the abundance of light sources makes it difficult to spot faint objects. This explains why an object so near to the Sun was not discovered in earlier searches.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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