Tags: Star.
15 Canis Majoris is a star in the constellation Canis Major.15 Canis Majoris is a blue-white B-type subgiant with a mean apparent magnitude of +4.82. It is approximately 1200 light years from Earth. It is classified as a Beta Cephei type variable star and its brightness varies from magnitude +4.79 to +4.84 with a period of 4.43 hours.