Tags: Star.
For other star systems with this Bayer designation see Omicron Canis Majoris.Omicron1 Canis Majoris (ο1 CMa ο1 Canis Majoris) is a star in the constellation Canis Major. Johann Bayer gave two adjacent stars the Bayer designation of Omicron Canis Majoris in 1603 but without distinguishing between the stars.