is a fixed binary, with visual magnitudes of 4.5 and 6.5.

S Monocerotis, or 15 Monocerotis, is a bluish white variable star and is located at the center of NGC 2264. The variation in its magnitude is slight (4.2-4.6). It has a companion star of visual magnitude 8.

V838 Monocerotis, a variable red supergiant

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