![]() ![]() Location of γ Geminorum (circled) |
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Observation data Epoch J2000 Equinox J2000 |
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Constellation | Gemini |
Right ascension | 06 |
Declination | +16° 23′ 57.4095″ |
Apparent magnitude (V) | 1.915 |
Characteristics | |
Spectral type | A1 IV |
U−B color index | +0.137 |
B−V color index | +0.005 |
Astrometry | |
Radial velocity (Rv) | -12.5 km/s |
Proper motion (μ) | RA: +13.81 mas/yr |
Parallax (π) | 29.84 ± 2.23mas |
Distance | 109 ± 8 ly (34 ± 3 pc) |
Orbit | |
Period (P) | 4,614.51 days |
Eccentricity (e) | 0.8933 ± 0.0013 |
Periastron epoch (T) | 244399.13 ± 0.77 |
Argument of periastron (ω) (secondary) |
312.60 ± 0.60° |
Semi-amplitude (K1) (primary) |
11.881 ± 0.068 km/s |
Details | |
Mass | 2.81M☉ |
Radius | 3.3R☉ |
Luminosity | 123L☉ |
Surface gravity (log g) | 3.60 |
Temperature | 9,260K |
Metallicity [Fe/H] | –0.12dex |
Rotational velocity (v sin i) | 15 km/s |
Other designations | |
Alhena, 24 Geminorum, BD +16°1223, FK5 251, GCTP1539.00, HIP 31681, HD 47105, HR 2421, SAO 95912.
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