Castor

alpha geminorum

Castor, Alpha Geminorum (α Gem), is a sextuple star system located in the constellation Gemini. It is composed of three binary pairs designated Castor A, Castor B and Castor C. The Castor sextet has a […]

Dubhe

alpha ursae majoris

Dubhe, Alpha Ursae Majoris (α UMa) is a spectroscopic binary star with an apparent magnitude of 1.79, located at an approximate distance of 123 light years from Earth. It is one of the seven bright […]