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OGLE-2005-BLG-390L
OGLE-2005-BLG-390L is a star thought to be a spectral type M (a red dwarf; 95% probability, 4% probability it is a white dwarf, <1% probability it is a neutron star or black hole). This dim magnitude 16 galactic bulge star is located in the Scorpius constellation at a far distance of about 21,500 light years.〔(【引用サイトリンク】 title =SIMBAD query result: NAME OGLE 2005-BLG-390 -- (Micro)Lensing Event )〕 It is the furthest known star with an exoplanet from our solar system.
== Planetary system ==
OGLE-2005-BLG-390L has one known planet, which was discovered using the technique of gravitational microlensing. Indications are that the planet is about five times Earth mass, orbiting at about 2.6 astronomical units from the parent star. The discovery was announced on January 25, 2006.〔 OGLE-2005-BLG-390Lb is considered one of the smallest known extrasolar planets around a main sequence star, possibly rocky, with a mass around 5.5 times that of the Earth. The orbital
radius (assuming a circular orbit) of the planet is 2.6 AU, however the orbital elements are unknown. Based on its low mass and estimated temperature of around 50 K, the planet is thought to consist mainly of ices, like Pluto or Uranus, rather than being a Jupiter-like gas giant.〔
File:OGLE-2005-BLG-390Lb planet.jpg|OGLE-2005-BLG-390Lb planet.
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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