Tau Ophiuchi Explained

Tau Ophiuchi (τ Oph) is a multiple star in the constellation Ophiuchus, approximately 167 light years away based on parallax. 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, orbiting each other with a period of 257 years and eccentricity around 0.77.[1] A is reported as a spectroscopic binary with a smaller star of 0.29 solar masses orbiting it every 186 days.[2] An additional component, C, has a separation of 100.8" and magnitude 11.28.[3]

Notes and References

  1. 2012A&A...546A..69M . 10.1051/0004-6361/201219774 . Dynamical masses of a selected sample of orbital binaries . Astronomy & Astrophysics . 546 . A69 . 2012 . Malkov . O. Yu. . Tamazian . V. S. . Docobo . J. A. . Chulkov . D. A. . free . Vizier catalog entry
  2. 2008MNRAS.389..925T . 10.1111/j.1365-2966.2008.13613.x . Comparative statistics and origin of triple and quadruple stars . Monthly Notices of the Royal Astronomical Society . 389 . 2 . 925–938 . 2008 . Tokovinin . A. . 0806.3263 . 16452670 .
  3. 2001AJ....122.3466M . 10.1086/323920 . The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog . The Astronomical Journal . 122 . 6 . 3466 . 2001 . Mason . Brian D. . Wycoff . Gary L. . Hartkopf . William I. . Douglass . Geoffrey G. . Worley . Charles E. . free . Vizier catalog entry

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