- Delta Cancri is a star in the constellation of Cancer. It has the proper name Asellus Australis, Delta Cancri is its Bayer designation. This star is visible to the naked eye with an apparent visual magnitude of +3.94. Based on parallax measurements, it is located at a distance of 137 light-years (42 pc) from Earth. It is drifting further away with a line of sight velocity of 16 km/s.