![]() The position of Castor within the Gemini Constellation. |
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Observation data Epoch J2000 Equinox J2000 |
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Constellation | Gemini |
Right ascension | 07 |
Declination | +31° 53′ 17.8160″ |
Apparent magnitude (V) | 1.93 / 2.97 |
Characteristics | |
Spectral type | A1 V + A2 Vm |
U−B color index | 0.02 |
B−V color index | 0.04 |
Astrometry | |
Radial velocity (Rv) | +6.0 / –1.2 km/s |
Proper motion (μ) | RA: –191.45 mas/yr |
Parallax (π) | 64.12 ± 3.75mas |
Distance | 51 ± 3 ly (15.6 ± 0.9 pc) |
Details | |
α Gem Aa | |
Mass | 2.76M☉ |
Radius | 2.4R☉ |
Surface gravity (log g) | 4.2 |
Temperature | 10,286K |
Metallicity [Fe/H] | 0.98dex |
Rotational velocity (v sin i) | 18 km/s |
α Gem Ba | |
Mass | 2.98M☉ |
Radius | 3.3R☉ |
Surface gravity (log g) | 4.0 |
Temperature | 8,842K |
Rotational velocity (v sin i) | 33 km/s |
Other designations | |
Castor, α Gem, 66 Gem, YY Gem, BD +32 1581/2, FK5 287, GCTP 1785.00, Gl 278, HD 60178/60179, HIP 36850, HR 2891, LTT 12038, SAO 60198.
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Database references | |
SIMBAD | Castor Aa data |
Database references | |
SIMBAD | Castor Ba data |