A

David

Darling

SMC X-1 (2U 0115-73)

SMC X-1 (2U 0115-73) is the most luminous known X-ray pulsar. Located in the Small Magellanic Cloud, it consists of a neutron star and the blue supergiant Sanduleak 160 (type B0I) in a close, 3.89-day-period orbit.