Named in honor of the German astronomer Hans Haffner (1912–1977), who worked in Göttingen from 1941 to 1953 prior to the Hamburg Observatory in Bergedorf. Since 1967 he has been Director at the Astronomical Institute of the University in Würzburg. His activity in astronomical photography and photometry is mainly directed towards the study of open clusters. Best known is his photographic photometry of Praesepe (together with Heckmann, see planet  (1650)). In addition he discovered 26 open clusters. (M 3827) _ _.