 He introduced three new constellations, the ″Globus cruciger″ (″Reichsapfel"), the ″Electoral Sword″ (″Kurfürstliches Schwert″) and the Sceptre of Brandenburg, which however were not recognized and adopted by the International Astronomical Union (IAU).Via Arnold he met his second wife Maria Margaretha Winkelmann (1670-1720), who had learnt astronomy from self-study and from Arnold.While jointly observing the comet of 1702, they discovered the globular cluster M 5 (5 May 1702).