Gliese 233

Gliese 233 (OU Gem) is a visual binary or possible Triple star located in the night sky at RA 06h 26m 10s and dec +18° 45′ 25″ [1] in the constellation of Gemini.

The system has an absolute magnitude of 5.91, so at a distance of 48.2 light Years it has an apparent magnitude of 6.76 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 [2] [3]

• The primary star, Gliese 233 A, is a K2Ve class star with a luminosity of 1.26817e+26, surface temperature of 5013±15k and a radial velocity of -8.6.[4] It has no known planets.

The primary star is also known as HD 45088, HIP 30630, BD+18° 1214, SAO 95677, YPC 1489.00, ADS 5054, and by the variable designation OU Gem.

• The secondary star in the system has a surface temperature of 4486±50 K and orbits the primary in about seven days. It is known as Gliese 233 B or YPC 1489.00. [5][6]

References

Bopp, Bernard. "HD 45088 As a BY Draconis Variable Publication of the Astronomical Society of the Pacific April 1980 p 218". 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 Et al., T.V. "OU Gem and AT Cap IN 1984/5 Commissions 27 and 42 of the IAU Information Bulliton on Variable Stars (number 4569)". 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.