Claim: The 3201 Sijthoff, named after Albert Georg Sijthoff and is assumed as an S-type asteroid, was discovered at Palomar Observatory in California on the 24th of September 1960.
Evidence: The assumed S-type asteroid has a rotation period of 4.607 hours. Albert Georg Sijthoff
(Dutch publisher) 24 September 1960 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.