Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Gemini |
Right ascension | 06h 03m 30.81s[1] |
Declination | +27° 41′ 50.6″[1] |
Apparent magnitude (V) | 12.9 - 13.6[2] |
Characteristics | |
Spectral type | K0I[2] |
Apparent magnitude (g) | 12.83[1] |
Variable type | eclipsing[3] |
Astrometry | |
Proper motion (μ) | RA: 0.209±0.021 mas/yr[1] Dec.: −0.385±0.015 mas/yr[1] |
Parallax (π) | 0.2057 ± 0.0197 mas[1] |
Distance | 16,000 ± 2,000 ly (4,900 ± 500 pc) |
Orbit[2] | |
Period (P) | 91.645 days |
Semi-major axis (a) | >0.63 ± 0.04 AU |
Inclination (i) | >80° |
Details | |
Supergiant | |
Mass | >0.7[3] M☉ |
Temperature | 4,500[2] K |
Black hole or class B | |
Mass | >3.5[3] M☉ |
Other designations | |
Database references | |
SIMBAD | data |
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]
ASAS-SN
was invoked but never defined (see the help page).