Named in honor of Immo Appenzeller (1940– ), professor of astronomy at Heidelberg University and since 1975 director of the observatory at Königstuhl. He has made important contributions to the fields of star formation, stellar evolution, interstellar magnetic fields and active galaxies. Appenzeller is also deeply involved in the development of astronomical instrumention. (M 18447) _ _.
Discovered on 4-8-1929 in Heidelberg by Wolf, M. F.