Visual binary star system in the constellation Ophiuchus
Xi Ophiuchi
Location of ξ Ophiuchi (circled)
Observation dataEpoch J2000 Equinox J2000
Constellation
Ophiuchus
Right ascension 17h 21m 00.37452s [ 1]
Declination
−21° 06′ 46.5710″[ 1]
Apparent magnitude (V)4.39[ 2]
Characteristics
Spectral type
F2V[ 3]
U−B color index
−0.06[ 4]
B−V color index
+0.41[ 4]
Astrometry Radial velocity (Rv )± 0.12[ 1] km/s Proper motion (μ) RA: +265.543 mas /yr [ 1] Dec.: −202.584 mas /yr [ 1] Parallax (π)57.0820± 0.1851 mas [ 1] Distance 57.1 ± 0.2 ly pc ) Absolute magnitude (MV )3.19[ 2] Details[ 5] A Mass 1.30 M ☉ Radius ± 0.06R ☉ Luminosity ± 0.035[ 6] L ☉ Surface gravity (log g )± 0.10cgs Temperature ± 80K Metallicity [Fe/H] ± 0.07dex Rotational velocity (v sin i )± 0.7Age 916[ 7] Myr Other designations ξ Oph , 40 Oph , BD −20°4731FK5 917GC 23423GJ 670HD 156897HIP 84893HR 6445SAO 185296CCDM J17210-2107ABWDS J17210-2107ABLTT 6908[ 8] Database references SIMBAD A B
ξ Oph , Latinized as Xi Ophiuchi , is a visual binary star [ 9] equatorial constellation of Ophiuchus .[ 2] apparent visual magnitude of 4.39.[ 2] light-years (17.5 parsecs ) away from the Sun based on parallax , but is drifting closer with a radial velocity of -9 km/s.[ 1]
The magnitude 4.40[ 10] F-type main-sequence star with a stellar classification of F2V.[ 3] [ 7] projected rotational velocity of 20 km/s. The star has 1.3 times the mass of the Sun and 1.6 times the Sun's radius .[ 5] [ 6] luminosity of the Sun from its photosphere at an effective temperature of 6,611 K.[ 5]
The system is a source of X-ray emission .[ 11] angular separation of ″ position angle of 26° from the primary, as of 2016. A magnitude 10.8 visual companion , component C, lies at a separation of [ 10]
According to Richard H. Allen's Star Names : Their Lore and Meaningθ Oph formed the Sogdian Wajrik "the Magician", the Khorasmian Markhashik "the Serpent-bitten" and with η Oph the Coptic Tshiō , "the Snake", and Aggia , "the Magician".[ 12] [ 13] Habitable Worlds Observatory .[ 14] [update] IAU Catalog of Star Names .[ 15]
References
^ a b c d e f Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties" . Astronomy and Astrophysics . 674 : A1. arXiv :2208.00211 Bibcode :2023A&A...674A...1G . doi :10.1051/0004-6361/202243940 S2CID 244398875 . Gaia DR3 record for this source at VizieR .^ a b c d Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters . 38 (5): 331. arXiv :1108.4971 Bibcode :2012AstL...38..331A . doi :10.1134/S1063773712050015 . S2CID 119257644 . Vizier catalog entry ^ 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 (1): 161– 170. arXiv :astro-ph/0603770 Bibcode :2006AJ....132..161G . doi :10.1086/504637 . S2CID 119476992 . ^ a b Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers . 42 (2): 443. Bibcode :2014JAVSO..42..443M . Vizier catalog entry ^ a b c Fuhrmann, K.; Chini, R.; Kaderhandt, L.; Chen, Z. (2017). "Multiplicity among Solar-type Stars" . The Astrophysical Journal . 836 (1): 139. Bibcode :2017ApJ...836..139F . doi :10.3847/1538-4357/836/1/139 ^ a b Brown, A. G. A. ; et al. (Gaia collaboration ) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties" . Astronomy & Astrophysics 616 . A1. arXiv :1804.09365 Bibcode :2018A&A...616A...1G doi :10.1051/0004-6361/201833051 Gaia DR2 record for this source at VizieR .^ 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. arXiv :1501.03154 Bibcode :2015ApJ...804..146D . doi :10.1088/0004-637X/804/2/146 . S2CID 33401607 . Vizier catalog entry ^ "ksi Oph" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved 2019-10-08 .^ Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems" . Monthly Notices of the Royal Astronomical Society . 389 (2): 869– 879. arXiv :0806.2878 Bibcode :2008MNRAS.389..869E . doi :10.1111/j.1365-2966.2008.13596.x S2CID 14878976 . ^ a b Mason, Brian D.; et al. (200). "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 ^ Haakonsen, Christian Bernt; Rutledge, Robert E. (September 2009). "XID II: Statistical Cross-Association of ROSAT Bright Source Catalog X-ray Sources with 2MASS Point Source Catalog Near-Infrared Sources". The Astrophysical Journal Supplement . 184 (1): 138– 151. arXiv :0910.3229 Bibcode :2009ApJS..184..138H . doi :10.1088/0067-0049/184/1/138 . S2CID 119267456 . ^ Allen, R.H. (1899), Star Names: Their Lore and Meaning ^ Rhoads, Jack W. (November 15, 1971), Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars (PDF) , Jet Propulsion Laboratory, California Institute of Technology. ^ Mamajek, Eric; Stapelfeldt, Karl (January 2023). NASA Exoplanet Exploration Program (ExEP) Mission Star List for the Habitable Worlds Observatory (2023) (PDF) (Report). arXiv :2402.12414 ^ "IAU Catalog of Star Names" . Retrieved 22 February 2025 .
