Sigma Cassiopeiae -- Double Star in Cassiopeia
Sigma Cassiopeiae is a double-star. Both of which appear blue to my eyes.
Sigma “A” has reached the end of its hydrogen-burning main-sequence stage
and currently is a subgiant-star shining 21,900-times as bright as our sun.
Sigma “B” has yet to deplete the hydrogen fuel at its core and is a much
smaller dwarf-star. But it is still a powerhouse pushing out the energy equal
to 1,835 times that of our sun. Together these bluish-stars rotate around each
other once every 14,000 years. A fine sight in the eyepiece.