1948 WA. Discovered 1948 Nov. 25 by S. Arend at Uccle.
Named in honor of Canon Georges Lemaître (1894–1966), professor of astronomy and celestial mechanics at the University of Louvain. He was a recognized authority on relativity, the three-body problem and cosmology. He was president of the Pontifical Academy, and he received the first Franqui Prize in Belgium. (M 3824)
This is the first newly numbered planet after World War II. Since then, all newly assigned names have been appropriately described in the MPC’s when they are announced. Lemaître is also honored by a lunar crater.