Castor (star) - The Castor System

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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