66 Ophiuchi

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66 Ophiuchi
Ophiuchus constellation map.svg
Red circle.svg
Location of 66 Ophiuchi (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Ophiuchus
Right ascension  18h 00m 15.79825s[1]
Declination 04° 22′ 07.0163″[1]
Apparent magnitude (V) 4.60[2]
Evolutionary stage main sequence
Spectral type B2Ve[3]
U−B color index −0.81[2]
B−V color index −0.02[2]
Variable type γ Cas[4]
Radial velocity (Rv)−12.80[5] km/s
Proper motion (μ) RA: +1.23[1] mas/yr
Dec.: −12.73[1] mas/yr
Parallax (π)5.01 ± 0.26[1] mas
Distance650 ± 30 ly
(200 ± 10 pc)
Absolute magnitude (MV)−2.51[6]
Mass8.8[7] M
Luminosity1524.63[6] L
Surface gravity (log g)3.69[8] cgs
Temperature22,000[9] K
Metallicity [Fe/H]0.00[8] dex
Rotational velocity (v sin i)250[10] km/s
Age14.0±3.2[7] Myr
Other designations
66 Oph, V2048 Oph, BD+04°3570, GC 24500, HD 164284, HIP 88149, HR 6712, SAO 123005, WDS J18003+0422AB[11]
Database references

66 Ophiuchi is a solitary[12] variable star[13] in the equatorial constellation of Ophiuchus. It has the variable star designation V2048 Ophiuchi, while 66 Ophiuchi is the Flamsteed designation. This object is visible to the naked eye as a faint, blue-white hued point of light with a baseline apparent visual magnitude of 4.60.[2] It is located approximately 650 light years away from the Sun based on parallax,[1] but is drifting closer with a radial velocity of −13 km/s.[5] The star has a peculiar velocity of 13.1±3.2 km/s[14] relative to its neighbors.

This is a main sequence Be star with a stellar classification of B2Ve.[3] It is a γ Cas variable; a shell star with a circumstellar disc of gas and is exhibiting irregular changes in brightness, ranging from 4.85 up to 4.55 magnitude.[4] The star is 14 million years old with 8.8[7] times the Sun's mass and is spinning rapidly with a projected rotational velocity of 250 km/s.[10] It is radiating 1,525[6] times the Sun's luminosity from its photosphere at an effective temperature of 22,000 K.[9]

A magnitude 6.5 visual companion at an angular separation of 0.1 has been reported.[15]


  1. ^ a b c d e f Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  2. ^ a b c d 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. ^ a b 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 Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....1.2025S.
  5. ^ a b Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
  6. ^ a b c 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
  7. ^ a b c Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (2011). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society. 410 (1): 190–200. arXiv:1007.4883. Bibcode:2011MNRAS.410..190T. doi:10.1111/j.1365-2966.2010.17434.x. Vizier catalog entry
  8. ^ a b 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.
  9. ^ a b Hohle, M.M.; Neuhäuser, R.; Schutz, B.F. (2010). "Masses and luminosities of O- and B-type stars and red supergiants". Astronomische Nachrichten. 331 (4): 349. arXiv:1003.2335. Bibcode:2010AN....331..349H. doi:10.1002/asna.200911355. Vizier catalog entry
  10. ^ a b Abt, Helmut A.; Levato, Hugo; Grosso, Monica (2002). "Rotational Velocities of B Stars". The Astrophysical Journal. 573 (1): 359–365. Bibcode:2002ApJ...573..359A. doi:10.1086/340590.
  11. ^ "66 Oph". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-06-21.
  12. ^ 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.
  13. ^ Floquet, M.; et al. (October 2002). "Variability and pulsations in the Be star 66 Ophiuchi". Astronomy and Astrophysics. 394: 137–149. Bibcode:2002A&A...394..137F. doi:10.1051/0004-6361:20021105.
  14. ^ Bobylev, V. V.; Bajkova, A. T. (August 2013). "Galactic kinematics from a sample of young massive stars". Astronomy Letters. 39 (8): 532–549. arXiv:1307.1677. Bibcode:2013AstL...39..532B. doi:10.1134/S106377371308001X.
  15. ^ 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