Tags: Star.
36 Ophiuchi is a triple star system 19.5 light years away 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 and 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 it has a negligible effect on the movements of the A-B pair. Both A and B have active chromospheres.