OU Geminorum

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OU Geminorum
Observation data
Epoch 2000      Equinox 2000
Constellation Gemini
Right ascension 06h 26m 10.25040s[1]
Declination +18° 45′ 24.8597″[1]
Apparent magnitude (V) 6.768[2]
Spectral type K3Vk[2]
U−B color index 0.662[2]
B−V color index 0.972[2]
Variable type BY Dra
Radial velocity (Rv) −8.6[3] km/s
Proper motion (μ) RA: −117.60[1] mas/yr
Dec.: −163.48[1] mas/yr
Parallax (π) 67.89 ± 1.53[1] mas
Distance 48 ± 1 ly
(14.7 ± 0.3 pc)
Absolute magnitude (MV) 5.93±0.05[2]
Surface gravity (log g) 4.30[4] cgs
Temperature 4,959[4] K
Metallicity [Fe/H] −0.21[4] dex
Rotational velocity (v sin i) 9.90[4] km/s
Other designations
OU Gem, BD+18 1214, GJ 233, HD 45088, HIP 30630, SAO 95677.[5]
Database references

OU Geminorum (OU Gem) is a visual binary or possible triple star located in the constellation of Gemini.

The system has an absolute magnitude of 5.93, so at a distance of 48 light years it has an apparent magnitude of 6.77 when viewed from earth. It also has a total Proper Motion of 0.210"/yr and belongs to the Ursa Major stream.

The system is a much studied BY Draconis variable star with a period of 6.99 days[6][7] The primary star has a spectral type of K3Vk. The secondary star in the system has a surface temperature of 4486±50 K and orbits the primary in about seven days.[8][9]


  1. ^ a b c d e van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752Freely accessible, doi:10.1051/0004-6361:20078357. 
  2. ^ a b c d e Koen, C.; et al. (April 2010), "UBV(RI)C JHK observations of Hipparcos-selected nearby stars", Monthly Notices of the Royal Astronomical Society, 403 (4): 1949–1968, Bibcode:2010MNRAS.403.1949K, doi:10.1111/j.1365-2966.2009.16182.x. 
  3. ^ Nordström, B.; et al. (2004), "The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ~14000 F and G dwarfs", Publications of the Astronomical Society of Australia, 21 (2): 129–133, Bibcode:2004PASA...21..129N, doi:10.1071/AS04013. 
  4. ^ a b c d Mishenina, T. V.; et al. (November 2012), "Activity and the Li abundances in the FGK dwarfs", Astronomy & Astrophysics, 547: 8, Bibcode:2012A&A...547A.106M, arXiv:1210.6843Freely accessible, doi:10.1051/0004-6361/201118412, A106. 
  5. ^ "V* OU Gem". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2015-04-17. 
  6. ^ http://www.ucm.es/info/Astrof/users/dmg/papers/pwIII/node10.html
  7. ^ http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?bibcode=1980PASP...92..218B&db_key=AST&page_ind=0&data_type=GIF&type=SCREEN_VIEW&classic=YES
  8. ^ http://www.ari.uni-heidelberg.de/datenbanken/aricns/cnspages/4c00500.htm
  9. ^ http://archive.is/20121209190058/http://cdsweb.cern.ch/record/411408/files/9912160.pdf

External links[edit]

Bopp, Bernard (April 1980). "HD 45088 As a BY Draconis Variable". Publication of the Astronomical Society of the Pacific. 92: 218. Bibcode:1980PASP...92..218B. doi:10.1086/130651. Retrieved 3 October 2011. 

Luck, R. Earle. "stars within 15 parsecs: abundances for a northern sample - The astronomical journal, 129:1063-1083, 2005 February". Retrieved 3 October 2011. 

Innes, T.V.; et al. "OU Gem and AT Cap IN 1984/5 (Commissions 27 and 42 of the IAU)". Information Bulletin on Variable Stars (number 4569). Bibcode:1998IBVS.4569....1I. Retrieved 3 October 2011. 

Mishenina T.V. et al. The New Absolute Parameters Of Ou Gem – The star Of By Dra Type Odessa Astronomical Publications, vol. 23 (2010)

University of Hamburg, The. "NEXXUS - Search the Gliese Catalogue". Retrieved 3 October 2011.