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Chi1 Orionis (χ1 Ori, χ1 Orionis) is a star about 28 light years away.〔 It is in the constellation Orion, where it can be seen in the tip of the Hunter's upraised club.〔Jim Kaler, (Chi-1 Orionis ).〕 χ1 Ori is a G0V star.〔König, B.; Fuhrmann, K.; Neuhäuser, R.; Charbonneau, D.;Jayawardhana, R., (Direct detection of the companion of chi1 Orionis ) ''Astronomy and Astrophysics'', vol. 394, L43, 2002.〕〔( Chi 1 Orionis ).〕 It has a faint companion with a mass estimated at about 15% of the mass of the Sun, an orbital period of 14.1 years, and an estimated stellar class of M6. The companion orbits an average distance of 6.1 AU from the primary, but has a fairly high orbital eccentricity, ranging from 3.3 AU out to 8.9 AU from the primary. Because of this red dwarf companion, the likelihood of habitable planets in this system is low. A necessary condition for the existence of a planet in this system are stable zones where the object can remain in orbit for long intervals. For hypothetical planets in a circular orbit around the individual members of this star system, this maximum orbital radius is computed to be 1.01 AU for the primary and 0.41 AU for the secondary. (Note that the orbit of the Earth is 1 AU from the Sun.) A planet orbiting outside of both stars would need to be at least 18.4 AU distant.〔 χ1 Ori is a candidate stream star member of the Ursa Major Moving Group, although there is some evidence to the contrary.〔 File:Chi 1 orionis diagram.jpg|Chi 1 orionis diagram File:Chi 1 orionis diagram vectorized.svg|Chi 1 orionis diagram ==References== 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「Chi1 Orionis」の詳細全文を読む スポンサード リンク
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