(second brightest star in Centaurus)
Beta Centauri (Hadar or Agena)
is a variable star in the southern sky
with magnitude +0.6.
It is a triple star and
a double-line spectroscopic binary,
including two nearly-equal stars orbiting
in 357 days, roughly 4 AU apart,
with a third star considerably further from them.
The pair are giant stars and all three
are B-type stars.
(star,bright star,binary star,variable star,giant star)
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Referenced by page:
B-type star (B)