b Tucanae

Beta Tucanae is a fine binocular double of two blue-white stars (b1 and b2): 4.4, 4.5; PA 170º and a separation of 27".

The stars are east of alpha Tucanae a little over half way to Achernar (alpha Eridani) and a bit to the south: binoculars.

While some observers have concluded that the third star here, b3, is not part of the binary system, others believe it in fact to be gravitationally bound to the other two. And in fact the most recent measurements show that it too is moving in the same direction, so we probably do have a triple system here.


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