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For small telescopes, or for getting beginners interested, Beta Tuc (1 and 2) makes for quite a nice pairing. Especially since you can first point out to people how it forms a naked-eye (or binocular) "double" with HIP 2578.
I also like Ruby Crucis (DY Cru, I think), for demonstrating colour and variability, next to Beta Cru and in the same FOV as the Jewel Box. Does that count?
Then there's Acamar, in Eridanus, and then the coloured pairs listed elsewhere.
Nice thread.
Cheers,
Brian.
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