13-May-2008, 03:57 PM
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Senior Member
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Join Date: Nov 2007
Location: Stars & Stripes
Posts: 1,047
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Castor: Triple binary
My goodness! I previously knew Castor was a double, but not a sextuple. 
http://www.astro.uiuc.edu/~kaler/sow/castor.html
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The telescope reveals Castor's real claim to fame as a remarkable multiple star.
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we find each of the two bright components, Castor A and Castor B, is yet again double! ... Moreover, the faint distant member, Castor C, is ALSO double!
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How ironic that one of the "twins" should in fact be made of three sets of twins, Castor certainly the sky's ranking sextuple, double- double-double, star.
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Whoa. You go Castor!!
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Castor may also be part of a hugely extended, physically related, group of stars called the "Castor Moving Group" that includes Vega, Fomalhaut, Zubenelgenubi, and Alderamin.
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The "Castor Moving Group" is new to me. I'm familiar with all stars mentioned in the "Castor Moving Group" except Alderamin.
Last edited by Nadme; 13-May-2008 at 03:58 PM.
Reason: Deleting excess article quotes (avoiding copyright issues)
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