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Gliese 436
Gliese 436 is a red dwarf approximately away in the zodiac constellation of Leo. It has an apparent visual magnitude of 10.67,〔 which is much too faint to be seen with the naked eye. However, it can be viewed with even a modest telescope of aperture.〔 In 2004, the existence of a transiting extrasolar planet, Gliese 436b, was verified as orbiting the star. In 2012, the existence of a second planet, UCF-1.01,〔(New Planet Found: Molten "Mars" Is "Right Around the Corner" ), Dave Mosher, National Geographic News, July 19, 2012〕 was also verified.
== Properties ==
Gliese 436 is a M2.5V star,〔 which means it is a red dwarf. Stellar models give an estimated size of about 42% of the Sun's radius. The same model predicts that the outer atmosphere has an effective temperature of 3,318 K,〔 giving it the orange-red hue of an M-type star.〔 Small stars such as this generate energy at a low rate, giving it only 2.5% of the Sun's luminosity.〔
Gliese 436 is older than the Sun by several billion years and it has an abundance of heavy elements (with masses greater than helium-4) equal to 48%〔 that of the Sun. The projected rotation velocity is 1.0 km/s, and the chromosphere has a low level of magnetic activity.〔 Gliese 436 is a member of the "old-disk population" with velocity components in the galactic coordinate system of ''U''=+44, ''V''=−20 and ''W''=+20 km/s.〔
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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