Tau_Ophiuchi
Tau Ophiuchi
Multiple star in the constellation Ophiuchus
Tau Ophiuchi (τ Oph) is a multiple star in the constellation Ophiuchus, approximately 167 light years away based on parallax.[1] Its two main components are two yellow-white main sequence stars, A, of magnitude 5.24 and class F2V, and B, of magnitude 5.94 and class F5V,[2] orbiting each other with a period of 257 years and eccentricity around 0.77.[7] A is reported as a spectroscopic binary with a smaller star of 0.29 solar masses orbiting it every 186 days.[5] An additional component, C, has a separation of 100.8" and magnitude 11.28.[8]