Companion 36 Ophiuchi B Luminosity (visual, LV) 0.28/0.27 L☉ Luminosity (visual, LV) 0.09 L☉ | Luminosity (bolometric) 0.33/0.36 L☉ Luminosity (bolometric) 0.20 L☉ ARICNS A | |
Similar 70 Ophiuchi, Groombridge 1618, 82 G Eridani, Delta Pavonis, Gliese 570 | ||
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.