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Hi Alex
Rigel is a quad system, though visually appears as a double. The pair BC is also a double with is two mag 7 stars at 0.1 arcsec apart, though visually appears as a single star mag 6.8 at 9 arc sec separation from A, which is fairly easy to split.
The fourth component D is mag 15 at 44 arc seconds separation from A.
FWIW the version of Sky Safari I’m using lists all the details but doesn’t show the secondary BC on the map. Your copy must be an older one !
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