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36 Ophiuchi
36 Ophiuchi is a triple star system 19.5 light years from Earth. It is in the constellation Ophiuchus. The primary and secondary stars are nearly identical orange main sequence dwarves of spectral type K2/K1; the tertiary star is an orange main sequence dwarf of spectral type K5. Star C is separated from the A-B pair by 700 arc seconds, compared to a minimum of 4.6 arcsec for A-B, so its effect on the movements of the A-B pair is small. A and B have active chromospheres. == Hunt for substellar objects == The McDonald Observatory team has set limits to the presence of one or more planets〔 around 36 Ophiuchi A with masses between 0.13 and 5.4 Jupiter masses and average separations spanning between 0.05 and 5.2 astronomical units, although beyond 1.5 AU orbits are inherently unstable around either 36 Ophiuchi A or 36 Ophiuchi B.〔Irwin ''et al.'' (1996).〕
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「36 Ophiuchi」の詳細全文を読む
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