α Capricorni

Alpha Capricorni ("Giedi", Ibex or goat) is a naked-eye optical binary; alpha2 is a giant 110 light years away, while alpha1 is a supergiant 690 light years away. Each member also has multiple companions.

Note that alpha2 is the brighter, thus given priority. The two have a colour contrast, yellow and orange, best seen in small telescopes, or even binoculars: 3.7, 4.2; 291, 376".

Most of the companions of each of the two stars, alpha2 Capricorni and alpha1, are too dim except for very large telescopes; alpha1 Capricorni has the most accessible companion, AC: 4.2, 9.6; 222, 47".

Finding alpha Capricorni should prove no difficulty with the naked eye. From Vega move down to Altair (alpha Aquilae) and then continue south almost the same distance.

Beta ("Dahib" - Lucky one of the slaughterers) in the same field, is a wide binary also with a colour contrast, a bright golden star with a fainter blue companion -- a lovely sight in binoculars: 3.2, 6.1; 267, separation 205".

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1999-2014 by Richard Dibon-Smith.