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40 Eridani A is quite bright, around magnitude 4.5, so naked eye visible even from my light polluted suburban backyard. It is one of the closest stars to us, only about 16 light years away.
B is around mag 9.7 and C is around mag 10.8.
These facts from the wonderful Burnham's Celestial Handbook, which is where I came across this interesting system in the first place.
-Ivan
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