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XO-2 Is a binary star. It consists of two components: XO-2S (Also known as XO-2A) and XO-2N (Also known as XO-2B).〔 This system is located approximately light-years away〔 from Earth in the Lynx constellation. Both of these stars are slightly cooler than the Sun and are nearly identical to each other. The system has a magnitude of 11 and cannot be seen with the naked eye but is visible through a small telescope. These stars are also notable for their large proper motions.〔 XO-2N and XO-2S have a separation of approximately AU.〔 == Planetary systems == One known exoplanet, XO-2Nb (or rarely XO-2Bb), which is classified as a hot Jupiter, was discovered by the XO Telescope using the transit method orbiting XO-2N (XO-2B) in 2007.〔 Two planets were reported to orbit around XO-2S in 2014 using radial velocity method. One of them is Jupiter-mass and another has a mass comparable to Saturn.〔 Both stars also show RV-trends, which may indicate the presence of additional long-periodic jovians or brown dwarfs around each of them. 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「XO-2 (star)」の詳細全文を読む スポンサード リンク
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