66 Ophiuchi

66 Ophiuchi


Location of 66 Ophiuchi (circled)

Observation data
Epoch J2000      Equinox J2000
Constellation Ophiuchus
Right ascension 18h 00m 15.79825s[1]
Declination 4° 22′ 07.0163″[1]
Apparent magnitude (V) 4.60[2]
Characteristics
Spectral type B2Ve[3]
U−B color index -0.81[2]
B−V color index -0.02[2]
Variable type γ Cas[4]
Astrometry
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]
Details
Mass8.8[7] M☉
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
Other designations
BD+04°3570, GC 24500, HIP 88149, HR 6712, HD 164284, SAO 123005, V2048 Oph, WDS J18003+0422AB
Database references
SIMBADdata

66 Ophiuchi is a class B2Ve[3] (blue main-sequence) star in the constellation Ophiuchus. Its apparent magnitude is 4.60[2] and it is approximately 650 light years away based on parallax.[1]

It is a γ Cas variable, a shell star with a circumstellar disc of gas and irregular changes in brightness, ranging from 4.85 to 4.55 magnitude.[4] A companion at separation 0.1" and magnitude 6.5 has been reported.[11]

References

  1. 1 2 3 4 5 6 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  2. 1 2 3 4 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. 1 2 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. 1 2 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. ↑ 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. ↑ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971Freely accessible. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. Vizier catalog entry
  7. ↑ 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: 190. arXiv:1007.4883Freely accessible. Bibcode:2011MNRAS.410..190T. doi:10.1111/j.1365-2966.2010.17434.x. Vizier catalog entry
  8. 1 2 Wu, Yue; Singh, H. P.; Prugniel, P.; Gupta, R.; Koleva, M. (2010). "Coudé-feed stellar spectral library – atmospheric parameters". Astronomy & Astrophysics. 525: A71. arXiv:1009.1491Freely accessible. Bibcode:2011A&A...525A..71W. doi:10.1051/0004-6361/201015014.
  9. ↑ 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:1003.2335Freely accessible. Bibcode:2010AN....331..349H. doi:10.1002/asna.200911355. Vizier catalog entry
  10. ↑ Abt, Helmut A.; Levato, Hugo; Grosso, Monica (2002). "Rotational Velocities of B Stars". The Astrophysical Journal. 573: 359. Bibcode:2002ApJ...573..359A. doi:10.1086/340590.
  11. ↑ 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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