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70 Ophiuchi
70 Ophiuchi is a binary star system located 16.6 light years away from the Earth. It is in the constellation Ophiuchus. At magnitude 4 it appears as a dim star visible to the unaided eye away from city lights.〔(【引用サイトリンク】 title =SIMBAD query result: V * V2391 Oph -- Spectroscopic binary )〕 ==Binary star== The primary star is a yellow-orange main sequence dwarf BY Draconis variable of spectral type K0, and the secondary star is an orange main sequence dwarf of spectral type K4.〔(【引用サイトリンク】 title =SIMBAD query result: LHS 459 -- High proper-motion Star )〕 The two stars orbit each other at an average distance of 23.2 AUs. But since the orbit is highly elliptical (at e=0.499), the separation between the two varies from 11.4 to 34.8 AUs, with one orbit taking 83.38 years to complete.〔(Solstation article giving details of orbital mechanics of the system )〕
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