| Identity |
| Name: | Castor, alpha Geminorum |
| Hipparcos catalog ID: | 36850 |
| Other 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 |
| R.A. | 7h 34m 36.00456s (+/-0.00009s) |
| Decl. | 31° 53' 19.0912" (+/-0.0010") |
| Parallax: | 63.27 (+/-1.23) |
| Derived distance: | 51.6 light years |
| Proper motion in R.A.: | -206.33 (+/-1.6) mas/year |
| Proper motion in decl.: | -148.18 (+/-1.47) mas/year |
| Constellation: | Gemini | |