The Castor System
| Parameter | Star Component | |||||
|---|---|---|---|---|---|---|
| Aa | Ab | Ba | Bb | Ca | Cb | |
| Spectral type | A1 V | Unknown (probably M5 V) | A2 Vm | M2 V | M0.5 Ve | M0.5 Ve |
| Mass (M☉) | 2.15 | 0.4–0.6 | 1.7 | 0.4–0.6 | 0.62 | 0.57 |
| Radius (R☉) | 2.3 | ? | 1.6 | ? | 0.76 | 0.68 |
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