Omicron Geminorum

ο Geminorum
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Gemini
Right ascension 07h 39m 09.93286s[1]
Declination +34° 35′ 03.6443″[1]
Apparent magnitude (V) 4.90[2]
Characteristics
Spectral type F3 III[3]
U−B color index +0.09[2]
B−V color index +0.41[2]
Astrometry
Radial velocity (Rv)+7.3[4] km/s
Proper motion (μ) RA: -33.42[1] mas/yr
Dec.: -118.17[1] mas/yr
Parallax (π)19.61 ± 0.30[1] mas
Distance166 ± 3 ly
(51.0 ± 0.8 pc)
Absolute magnitude (MV)1.35[5]
Details
Radius3.7[6] R☉
Luminosity24[7] L☉
Surface gravity (log g)3.56[8] cgs
Temperature6,309[7] K
Metallicity [Fe/H]+0.12[5] dex
Rotational velocity (v sin i)91.1[8] km/s
Age1[5] Gyr
Other designations
ο Gem, 71 Geminorum, BD+34° 1649, FK5 2592, HD 61110, HIP 37265, HR 2930, SAO 60247.[9]
Database references
SIMBADdata

Omicron Geminorum (ο Gem) is a solitary[10] star in the constellation Gemini. It is faintly visible to the naked eye with an apparent visual magnitude of 4.90.[2] Based upon an annual parallax shift of 19.61 mas,[1] it is located at a distance of 166 light years from the Sun.

This is an F-type giant star[8] with a stellar classification of F3 III.[3] The measured angular diameter is 0.68±0.03 mas,[11] which, at its estimated distance, yields a physical size of about 3.7 times the radius of the Sun.[6] It radiates approximately 24 times the solar luminosity from an outer atmosphere at an effective temperature of 6,309 K.[7]

References

  1. 1 2 3 4 5 6 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752 Freely accessible, doi:10.1051/0004-6361:20078357.
  2. 1 2 3 4 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV data, SIMBAD, Bibcode:1986EgUBV........0M.
  3. 1 2 Eggen, O. J. (1962), "Space-velocity vectors for 3483 stars with proper motion and radial velocity", Royal Observatory Bulletin, 51, Bibcode:1962RGOB...51...79E.
  4. ↑ Wielen, R.; et al. (2000), "Sixth Catalogue of Fundamental Stars (FK6). Part III. Additional fundamental stars with direct solutions", Veröffentlichungen Astronomisches Rechen-Institut Heidelberg, Karlsruhe: Verlag G. Braun (37), pp. 1−308, Bibcode:2000VeARI..37....1W, ISBN 3-7650-0536-3.
  5. 1 2 3 Holmberg, J.; et al. (July 2009), "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics", Astronomy and Astrophysics, 501 (3): 941–947, Bibcode:2009A&A...501..941H, arXiv:0811.3982 Freely accessible, doi:10.1051/0004-6361/200811191.
  6. 1 2 Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1.. The radius (R*) is given by:
  7. 1 2 3 McDonald, I.; et al. (2012). "Fundamental Parameters and Infrared Excesses of Hipparcos Stars". Monthly Notices of the Royal Astronomical Society. 427 (1): 343–57. Bibcode:2012MNRAS.427..343M. arXiv:1208.2037 Freely accessible. doi:10.1111/j.1365-2966.2012.21873.x.
  8. 1 2 3 Schröder, C.; et al. (January 2009), "Ca II HK emission in rapidly rotating stars. Evidence for an onset of the solar-type dynamo", Astronomy and Astrophysics, 493 (3): 1099–1107, Bibcode:2009A&A...493.1099S, doi:10.1051/0004-6361:200810377.
  9. ↑ "omi Gem -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2016-12-07.
  10. ↑ 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, Bibcode:2008MNRAS.389..869E, arXiv:0806.2878 Freely accessible, doi:10.1111/j.1365-2966.2008.13596.x.
  11. ↑ Richichi, A.; et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics, 431 (2): 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039.
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