Named in honor of Luigi Giuseppe Jacchia {1911–1996}, research associate at the Harvard College Observatory since 1939 and a physicist at the Smithsonian Astrophysical Observatory. In his work on meteors and subsequently on the motions of artificial satellites he has made pioneering investigations of the Earth’s upper atmosphere. His interest in variable stars dates from his student days in Bologna, and he is well known as an extraordinary linguist. (M 4421) _ _.