Theta2 Microscopii Explained

Theta2 Microscopii (θ2 Mic) is a class A0III (white giant) star in the constellation Microscopium. Its apparent magnitude is 5.76 and it is approximately 390 light years away based on parallax. It is an Ap star, a chemically peculiar star with unusually strong metallic spectral lines.[1]

The main star is known to be a binary, with two components A (6.24 mag) and B (6.88 mag) orbiting with a semimajor axis of 0.836" and eccentricity 0.201, with a period 464.66 years.[2] A more distant companion, C, has a separation around 78.4" and magnitude 10.3.[3]

Notes and References

  1. 2009A&A...498..961R . Catalogue of Ap, HGMN and Am stars . Astronomy and Astrophysics . 498 . 3 . 961 . Renson . P. . Manfroid . J. . 2009 . 10.1051/0004-6361/200810788 . free .
  2. 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
  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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