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HD 2039 is a yellow dwarf or yellow subgiant star in the constellation Phoenix. The star is not visible to the naked eye, and lies approximately 330 light years away from the Sun. HD 2039 is a relatively stable star, and an exoplanet at least three times the mass of the planet Jupiter has been discovered in its orbit; this exoplanet, known as HD 2039 b, was the 100th exoplanet to be discovered.〔 ==Nomenclature== The designation ''HD 2039'' from the Henry Draper Catalogue. The catalogue, which was published between 1918 and 1924, was based on the work of Annie Jump Cannon and her team between 1911 and 1915.〔pp. 214–215 in The Henry Draper Memorial, Annie J. Cannon, ''Journal of the Royal Astronomical Society of Canada'' 9, #5 (May–June 1915), pp. 203–215, .〕〔The Henry Draper Catalogue, Annie J. Cannon and Edward C. Pickering, ''Annals of Harvard College Observatory''; hours 0 to 3, 91 (1918), ; hours 4 to 6, 92 (1918), ; hours 7 to 8, 93 (1919), ; hours 9 to 11, 94 (1919), ; hours 12 to 14, 95 (1920), ; hours 15 to 16, 96 (1921), ; hours 17 to 18, 97 (1922), ; hours 19 to 20, 98 (1923), ; hours 21 to 23, 99 (1924), .〕 HD 2039 does not have a common, collaquial name that is characteristic of stars like Sirius, Procyon, and Aldebaran. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「HD 2039」の詳細全文を読む スポンサード リンク
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