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]
Distance7340 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
Temperature4,500[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. 1.0 1.1 Cutri, R. M.; Skrutskie, M. F.; Van Dyk, S.; Beichman, C. A.; Carpenter, J. M.; Chester, T.; Cambresy, L.; Evans, T. et al. (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. 2.0 2.1 2.2 2.3 2.4 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/9911179. Bibcode 2000AJ....119..890B. doi:10.1086/301230.
  3. 3.0 3.1 3.2 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/0205157. Bibcode 2002AJ....124.1054K. doi:10.1086/341651.

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