Magellanic Clouds
Sanduleak was a spectroscopist who worked on a number of very large objective prism surveys. He discovered Nova Aurigae 1964 on one of the objective prism plates. He was the first to discover metallicity differences between the Small and Large Magellanic Clouds, and wrote papers about a number of spectroscopically interesting objects. He produced a catalogue of stars in the Magellanic Clouds which included the star Sanduleak -69° 202, the progenitor of the supernova SN 1987A.