Phi Ophiuchi

Phi Ophiuchi (φ Oph) is a class G8+IIIa[3] (yellow giant) star in the constellation Ophiuchus. Its apparent magnitude is 4.27[2] and it is approximately 244 light years away based on parallax.[1]

φ Ophiuchi
Location of φ Ophiuchi (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Ophiuchus
Right ascension  16h 31m 08.36732s[1]
Declination −16° 36′ 45.8306″[1]
Apparent magnitude (V) 4.27[2]
Characteristics
Spectral type G8+IIIa[3]
U−B color index +0.71[2]
B−V color index +0.92[2]
Astrometry
Radial velocity (Rv)-33.46[4] km/s
Proper motion (μ) RA: -45.35[1] mas/yr
Dec.: -37.34[1] mas/yr
Parallax (π)13.39 ± 0.24[1] mas
Distance244 ± 4 ly
(75 ± 1 pc)
Absolute magnitude (MV)-0.08[5]
Details
Mass3.16[6] M☉
Radius13.40[6] R☉
Luminosity112[6] L☉
Surface gravity (log g)2.82[7] cgs
Temperature5,131[6] K
Metallicity [Fe/H]+0.20[7] dex
Rotational velocity (v sin i)3.6[8] km/s
Other designations
BD-16 4298, CCDM J16311-1636A, 8 Ophiuchi, GC 22200, HIP 80894, HR 6147, HD 148786, SAO 159963, WDS J16311-1637A
Database references
SIMBADdata

It is a multiple star with two companions, B, at magnitude 12.9 and separation 41.3", and C, at magnitude 10.8 and separation 119.8".[9]

References
  1. Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  2. Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
  3. Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H. 5050. Bibcode:1995yCat.5050....0H.
  4. Massarotti, Alessandro; Latham, David W.; Stefanik, Robert P.; Fogel, Jeffrey (2008). "Rotational and Radial Velocities for a Sample of 761 Hipparcos Giants and the Role of Binarity". The Astronomical Journal. 135: 209. Bibcode:2008AJ....135..209M. doi:10.1088/0004-6256/135/1/209.
  5. 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. Vizier catalog entry
  6. Reffert, Sabine; Bergmann, Christoph; Quirrenbach, Andreas; Trifonov, Trifon; Künstler, Andreas (2015). "Precise radial velocities of giant stars". Astronomy & Astrophysics. 574: A116. arXiv:1412.4634. Bibcode:2015A&A...574A.116R. doi:10.1051/0004-6361/201322360. hdl:10722/215277. Vizier catalog entry
  7. Wu, Yue; Singh, H. P.; Prugniel, P.; Gupta, R.; Koleva, M. (2010). "Coudé-feed stellar spectral library – atmospheric parameters". Astronomy & Astrophysics. 525: A71. arXiv:1009.1491. Bibcode:2011A&A...525A..71W. doi:10.1051/0004-6361/201015014.
  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. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. 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


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