(17855) Geffert = 1998 KK
Discovered 1998 May 19 at the Starkenburg Observatory, Heppenheim.
The German amateur astronomer Martin Geffert (b. 1922) has been very dedicated to the Starkenburg Observatory, being one of the founders and treasurer of the observatory since its beginnings in 1970. He is also an excellent performer on the mandolin.