Omega Ophiuchi

ω Ophiuchi


Location of ω Ophiuchi (circled)

Observation data
Epoch J2000      Equinox J2000
Constellation Ophiuchus
Right ascension 16h 32m 08.19983s[1]
Declination −21° 27′ 59.0120″[1]
Apparent magnitude (V) 4.45[2]
Characteristics
Spectral type A7p[3]
U−B color index +0.13[2]
B−V color index +0.11[2]
Variable type α² CVn[4]
Astrometry
Radial velocity (Rv)+2.50[5] km/s
Proper motion (μ) RA: +21.12[1] mas/yr
Dec.: +35.26[1] mas/yr
Parallax (π)19.34 ± 0.21[1] mas
Distance169 ± 2 ly
(51.7 ± 0.6 pc)
Absolute magnitude (MV)0.88[6]
Details
Mass2.06[7] M☉
Radius3.0[7] R☉
Luminosity37.27[6] L☉
Surface gravity (log g)3.94[8] cgs
Temperature8,541[8] K
Metallicity [Fe/H]-0.47[9] dex
Rotational velocity (v sin i)48[8] km/s
Other designations
BD-21 4381, 9 Ophiuchi, FK5 3307, GC 22221, HIP 80975, HR 6153, HD 148898, SAO 184450
Database references
SIMBADdata

Omega Ophiuchi (ω Oph) is a class A7[3] star in the constellation Ophiuchus. Its apparent magnitude is 4.45[2] and it is approximately 168.6 light years away based on parallax.[1]

It is an α² CVn variable, ranging from 4.51 to 4.44 magnitude with a period of 2.99 days.[4]

References

  1. 1 2 3 4 5 6 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. Bibcode:2007A&A...474..653V. arXiv:0708.1752 Freely accessible. 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. 1 2 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. Bibcode:2012AstL...38..331A. arXiv:1108.4971 Freely accessible. doi:10.1134/S1063773712050015. Vizier catalog entry
  7. 1 2 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/9911002 Freely accessible. Vizier catalog entry
  8. 1 2 3 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:1501.03154 Freely accessible. doi:10.1088/0004-637X/804/2/146. Vizier catalog entry
  9. ↑ Soubiran, Caroline; Le Campion, Jean-François; Brouillet, Nathalie; Chemin, Laurent (2016). "The PASTEL catalogue: 2016 version". Astronomy & Astrophysics. 591: A118. Bibcode:2016A&A...591A.118S. arXiv:1605.07384 Freely accessible. doi:10.1051/0004-6361/201628497.
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