Heinrich Ludwig d'Arrest
Heinrich Ludwig d'Arrest (1822-1875)
(public domain image)
D'Arrest was a German astronomer who worked at the Berlin Observatory, where, together with Galle, he discovered Neptune. His career took him to Leipzig where he was a Professor of Astronomy, and on to Copenhagen Observatory. At each of these institutions he was able to observe with some of the best instruments of the day, using them to discover 321 deep sky objects, a comet (6P/d'Arrest) and an asteroid (76 Freia).