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Sigma Orionis is just below Orion's Belt.
This is a young binary system consisting entirely of dwarf stars several million years old. Jim Kaler points out that only the AB orbit is stable; the others will eventually part the system. The whole system will end when the primary explodes, sending B out on its own (if it doesn't explode as well). The other components will dwindle and slowly expire as white dwarfs.
While the system as a whole goes under the binary label Struve 762, the AB component is actually BU 1032:
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