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PSR B1620-26 b
PSR B1620-26 b is an extrasolar planet located approximately 12,400 light-years away from Earth in the constellation of Scorpius. It bears the unofficial nicknames "Methuselah" and "the Genesis planet" due to its extreme age and a few popular sources refer to this object as "PSR B1620-26 c" (see below for discussion). The planet is in a circumbinary orbit around the two stars of PSR B1620-26 (which are a pulsar (PSR B1620-26 A) and a white dwarf (WD B1620-26)) and is the first circumbinary planet ever confirmed. It is also the first planet found in a globular cluster. The planet is one of the oldest known extrasolar planets, believed to be about 12.7 billion years old.
==Name==
While the designation PSR B1620-26 b is not used in any scientific papers, the planet is listed in the SIMBAD database as PSR B1620-26 b. Some popular sources use the designation PSR B1620-26 c to refer to the planet, as it was described as the third member of a triple system (composed of the planet and two stars). This designation doesn't appear in the SIMBAD database, and more modern naming conventions use a separated lettering system where lower-case letters to refer to planets and upper-case letters to designate stars (e.g. Gliese 667C c is the 'c' planet orbiting Gliese 667C, which is the 'C' star of a triple system), making PSR B1620-26 b the designation for a planet orbiting both stars of the PSR B1620-26 system. Neither usage is employed in the scientific literature with respect to the PSR B1620-26 planet.
Though not officially recognized, the name "Methuselah" is commonly used for the planet in popular articles. The name comes from the biblical person Methuselah (who was the oldest living person). This name is usually used as the informal name to show the similarities to the planets of the solar system, while the "latter name" is used astronomically. Methuselah is the only planet to have received a biblical name, although three additional extrasolar planets have been given mythological names (just like in the solar system), those planets being Bellerophon, Zarmina and Osiris.
PSR B1620-26 b is one of the oldest planets in the universe, at approximately 12.7 billion years old. It has been undergoing many stages through its lifetime.
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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