Xi Ophiuchi

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ξ Ophiuchi
Ophiuchus constellation map.svg
Red circle.svg

Location of ξ Ophiuchi (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Ophiuchus
Right ascension 17h 21m 00.37520s[1]
Declination −21° 06′ 46.5663″[1]
Apparent magnitude (V) 4.39[2]
Spectral type F2V[3]
U−B color index -0.06[4]
B−V color index +0.41[4]
Radial velocity (Rv) -9.10[5] km/s
Proper motion (μ) RA: +263.84[1] mas/yr
Dec.: -205.85[1] mas/yr
Parallax (π) 57.62 ± 0.26[1] mas
Distance 56.6 ± 0.3 ly
(17.36 ± 0.08 pc)
Absolute magnitude (MV) 3.19[2]
Mass 1.37[6] M
Radius 1.4[6] R
Luminosity 4.43[2] L
Surface gravity (log g) 4.37[7] cgs
Temperature 6,848[7] K
Metallicity [Fe/H] -0.17[2] dex
Rotational velocity (v sin i) 20.5[8] km/s
Other designations
BD-20°4731, CCDM J17210-2107AB, 40 Ophiuchi, GC 23423, HIP 84893, HR 6445, HD 156897, LTT 6908, SAO 185296, WDS J17210-2107AB
Database references

Xi Ophiuchi (ξ Oph) is a multiple star system in the constellation Ophiuchus, approximately 56.6 light years away based on parallax.[1]

The primary is a class F2V[3] (yellow-white dwarf) star with apparent magnitude is 4.39.[2] Component B has a magnitude of 8.9 and a separation of 3.5", while component C has a magnitude of 13.7 and a separation of 10.8.[9]


  1. ^ a b c d e f Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. Bibcode:2007A&A...474..653V. arXiv:0708.1752Freely accessible. doi:10.1051/0004-6361:20078357.  Vizier catalog entry
  2. ^ a b c d e Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. Bibcode:2012AstL...38..331A. arXiv:1108.4971Freely accessible. doi:10.1134/S1063773712050015.  Vizier catalog entry
  3. ^ a b Gray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Bubar, E. J.; McGahee, C. E.; O'Donoghue, A. A.; Knox, E. R. (2006). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc--The Southern Sample". The Astronomical Journal. 132: 161. Bibcode:2006AJ....132..161G. arXiv:astro-ph/0603770Freely accessible. doi:10.1086/504637. 
  4. ^ a b Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers. 42: 443. Bibcode:2014JAVSO..42..443M. Vizier catalog entry
  5. ^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. 
  6. ^ a b Allende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures". Astronomy and Astrophysics. 352: 555. Bibcode:1999A&A...352..555A. arXiv:astro-ph/9911002Freely accessible.  Vizier catalog entry
  7. ^ a b David, Trevor J.; Hillenbrand, Lynne A. (2015). "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal. 804 (2): 146. Bibcode:2015ApJ...804..146D. arXiv:1501.03154Freely accessible. doi:10.1088/0004-637X/804/2/146.  Vizier catalog entry
  8. ^ De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (2014). "A catalog of rotational and radial velocities for evolved stars". Astronomy & Astrophysics. 561: A126. Bibcode:2014A&A...561A.126D. arXiv:1312.3474Freely accessible. doi:10.1051/0004-6361/201220762.  Vizier catalog entry
  9. ^ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466. Bibcode:2001AJ....122.3466M. doi:10.1086/323920.  Vizier catalog entry