| Identity |
| Name: | Castor, alpha Geminorum |
| Hipparcos catalog ID: | 36850 |
| Other star catalog entries: | HD 60179
SAO 0
BD B+32 1581
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| Appearance |
| Visual magnitude: | 1.58 (source: ground based) |
| Spectral type: | A2Vm |
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| Position and motion (Epoch J1991.25) in J2000 reference frame |
| Right ascension | 7h 34m 36.00472s (+/-0.00026s) |
| Declination | 31° 53' 19.0864" (+/-0.0026") |
| Parallax: | 64.12 (+/-3.75) mas |
| Derived distance: | 50.9 light-years |
| Proper motion in R.A.: | -191.45 (+/-3.95) mas/year |
| Proper motion in declination: | -145.19 (+/-2.95) mas/year |
| Constellation: | Gemini | |