Tags: Star.
Xi1 Canis Majoris (ξ1 CMa ξ1 Canis Majoris) is a star in the constellation Canis Major. It is approximately 2051 light years from Earth.ξ1 Canis Majoris is a blue-white B-type subgiant with a mean apparent magnitude of +4.34. It is classified as a Beta Cephei type variable star and its brightness varies from magnitude +4.33 to +4.36 with a period of 5.03 hours.