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Old 04-06-2011, 10:15 PM
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renormalised (Carl)
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Join Date: Apr 2008
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Albireo (beta Cygni) is another good binary for newbies to have a go at. Another target of note is Hadar (beta Centauri) but you'll need a large scope to separate the two (1.3"). What's more, the primary is also a spectroscopic binary of nearly equal sized stars...both blue giants and variables of the beta Cephei type. 61 Cygni is also a classic binary for newbies to track down. It consists of two K class stars (primary star is K5, the secondary K7) in a wide orbit (about 700 or so years) and lie about 11.4ly from Earth. Their particular historical note is in their high proper motion (one of the highest) and the fact they were the first stars to have their distance measured by the parallax method.
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