1931 EC. Discovered 1931 Mar. 13 by M. F. Wolf at Heidelberg.

Named in honor of Mrs. Irmela Ruska, the wife of Ernest Ruska who invented the electron microscope and received the Nobel Prize in 1986. The prize had to be shared with B. Binnig and H. Rohrer. (H 109)

The naming was granted by the discoverer to A. Kopff.