1935 CY. Discovered 1935 Feb. 13 by H. van Gent at Johannesburg.
Named in memory of A. Pannekoek (1873–1960), Dutch astronomer, director of the Astronomical Institute of the Municipal University in Amsterdam from 1921 to 1941. His main activity was stellar astrophysics. (M 18135)
Pannekoek is also honored by a lunar crater.