 On September 28 , 2007 the main belt asteroid 11430 ( 9560 P @-@ L ) was named after him and is now known as 11430 Lodewijkberg . The asteroid was discovered October 17 , 1960 by Cornelis Johannes van Houten and Ingrid van Houten @-@ Groeneveld at Leiden Observatory , where they were studying photographic plates taken by Tom Gehrels using the Palomar Observatory 's Samuel Oschin telescope . 
