Upsilon Ophiuchi

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υ Ophiuchi
Ophiuchus constellation map.svg
Red circle.svg

Location of υ Ophiuchi (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Ophiuchus
Right ascension 16h 27m 48.18720s[1]
Declination −8° 22′ 18.2245″[1]
Apparent magnitude (V) 4.62[2]
Spectral type A3m[3]
U−B color index +0.06[4]
B−V color index +0.16[4]
Radial velocity (Rv) -30.60[5] km/s
Proper motion (μ) RA: -67.49[1] mas/yr
Dec.: -11.75[1] mas/yr
Parallax (π) 24.42 ± 0.91[1] mas
Distance 134 ± 5 ly
(41 ± 2 pc)
Absolute magnitude (MV) 1.75[2]
Primary υ Oph A
Companion υ Oph B
Period (P) 82.8 ± 1.4 yr
Semi-major axis (a) 0.79 ± 0.03″
Eccentricity (e) 0.45 ± 0.03
Inclination (i) 31.2 ± 5.7°
Longitude of the node (Ω) 86.8 ± 6.9°
Periastron epoch (T) B 1994.1 ± 1.0
Argument of periastron (ω)
177.9 ± 7.4°
Mass 1.94[7] M
Radius 1.9[7] R
Luminosity 16.56[2] L
Surface gravity (log g) 4.45[8] cgs
Temperature 8,364[8] K
Metallicity [Fe/H] +0.14[2] dex
Rotational velocity (v sin i) 44[3] km/s
Other designations
BD-08°4243, CCDM J16278-0822AB, 3 Ophiuchi, FK5 3299, GC 22134, HIP 80628, HR 6129, HD 148367, SAO 141187, WDS J16278-0822Aa,Ab
Database references

Upsilon Ophiuchi (υ Oph) is a class A3[3] star in the constellation Ophiuchus. Its apparent magnitude is 4.62[2] and it is approximately 134 light years away based on parallax.[1]

The primary, Aa, is a spectroscopic binary with estimated period 27.2 days and eccentricity 0.74, and has a close companion Ab, of magnitude 8.83, in an 82.8 year orbit with eccentricity 0.45.[9][10]


  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 c 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. ^ 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. ^ Wilson, R. E. (1953). General Catalogue of Stellar Radial Velocities. Carnegie Institution for Science. Bibcode:1953GCRV..C......0W. LCCN 54001336. 
  6. ^ "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Retrieved 24 May 2017. 
  7. ^ 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
  8. ^ 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
  9. ^ Malkov, O. Yu.; Tamazian, V. S.; Docobo, J. A.; Chulkov, D. A. (2012). "Dynamical masses of a selected sample of orbital binaries". Astronomy & Astrophysics. 546: A69. Bibcode:2012A&A...546A..69M. doi:10.1051/0004-6361/201219774.  Vizier catalog entry
  10. ^ Eggleton, P. P.; Tokovinin, A. A. (2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869. Bibcode:2008MNRAS.389..869E. arXiv:0806.2878Freely accessible. doi:10.1111/j.1365-2966.2008.13596.x.  Vizier catalog entry