BG Geminorum

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BG Geminorum
Satellite image of binary star system BG Geminorum

Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Gemini
Right ascension 06h 03m 30.81s[1]
Declination +27° 41′ 50.7″[1]
Apparent magnitude (V) 12.9 - 13.6[2]
Spectral type K0I[2]
Distance 7340 ly
(2.25±0.25[2] pc)
Period (P) 91.645 days
Semi-major axis (a) >0.63 ± 0.04 AU
Inclination (i) >80°
Mass >0.7[3] M
Temperature 4,500[2] K
Black hole or class B
Mass >3.5[3] M
Other designations
BG Geminorum, 2MASS J06033081+2741506
Database references

BG Geminorum is an eclipsing binary star system in the constellation Gemini. It consists of a K0 supergiant with a more massive but unseen companion. The companion is likely to be either a black hole or class B star. Material from the K0 star is being transferred to an accretion disk surrounding the unidentified object.[3]


  1. ^ a b Cutri, R. M.; Skrutskie, M. F.; Van Dyk, S.; Beichman, C. A.; Carpenter, J. M.; Chester, T.; Cambresy, L.; Evans, T.; Fowler, J.; Gizis, J.; Howard, E.; Huchra, J.; Jarrett, T.; Kopan, E. L.; Kirkpatrick, J. D.; Light, R. M.; Marsh, K. A.; McCallon, H.; Schneider, S.; Stiening, R.; Sykes, M.; Weinberg, M.; Wheaton, W. A.; Wheelock, S.; Zacarias, N. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". VizieR On-line Data Catalog: II/246. Originally published in: 2003yCat.2246....0C. 2246. Bibcode:2003yCat.2246....0C. 
  2. ^ a b c d e Benson, Priscilla J (2000). "An Optical Study of BG Geminorum: An Ellipsoidal Binary with an Unseen Primary Star". The Astronomical Journal. 119 (2): 890. arXiv:astro-ph/9911179Freely accessible. Bibcode:2000AJ....119..890B. doi:10.1086/301230. 
  3. ^ a b c Kenyon, Scott J (2002). "The Eclipsing Binary BG Geminorum: Improved Constraints on the Orbit and the Structure of the Accretion Disk". The Astronomical Journal. 124 (2): 1054. arXiv:astro-ph/0205157Freely accessible. Bibcode:2002AJ....124.1054K. doi:10.1086/341651.