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Upsilon Andromedae
Upsilon Andromedae (υ Andromedae, υ And) is a binary star located approximately 44 light-years from Earth in the constellation Andromeda. The primary star (Upsilon Andromedae A) is an F-type main-sequence star that is somewhat younger than the Sun. The second star (Upsilon Andromedae B) is a red dwarf in a wide orbit around the primary.
As of 2010, four confirmed exoplanets are known to orbit the primary star. All four are likely to be jovian planets that are comparable in size to Jupiter. Upsilon Andromedae was both the first multiple-planet system to be discovered around a main-sequence star, and the first multiple-planet system known in a multiple star system. Upsilon Andromedae A was ranked 21st in the list of top 100 target stars for NASA's cancelled Terrestrial Planet Finder mission.
== Distance and visibility ==
Upsilon Andromedae is located fairly close to the Solar System: the parallax of Upsilon Andromedae A was measured by the Hipparcos astrometry satellite as 74.12 milliarcseconds, corresponding to a distance of 13.49 parsecs (44 light years).〔 Upsilon Andromedae A has an apparent magnitude of +4.09, making it visible to the naked eye even under moderately light-polluted skies, about 10 degrees east of the Andromeda Galaxy. The dimmer star Upsilon Andromedae B is only visible with a telescope.
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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