Claim: The 3201 Sijthoff, named after Albert Georg Sijthoff and is assumed as an S-type asteroid, was discovered at Palomar Observatory in September 1960.
Evidence: It was named after Dutch publisher and popularizer of astronomy, Albert Georg Sijthoff. The assumed S-type asteroid has a rotation period of 4.607 hours. It was discovered during the Palomar–Leiden survey on 24 September 1960, by Ingrid and Cornelis van Houten at Leiden, and Tom Gehrels at Palomar Observatory in California, United States. 
Albert Georg Sijthoff
(Dutch publisher) Palomar Obs. 24 September 1960 The assumed S-type asteroid has a rotation period of 4.607 hours. 3201 Sijthoff