190463
It was discovered by Cornelis Johannes van Houten , Ingrid van Houten-Groeneveld , and Tom Gehrels at the Palomar Observatory in San Diego County , California , on October 17 , 1960 .
 person: Cornelis Johannes van Houten; person: Ingrid van Houten-Groeneveld; person: Tom Gehrels; organization: Palomar Observatory; location: San Diego County; location: California
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Cornelis Johannes van Houten, Ingrid van Houten-Groeneveld, Tom Gehrels, Palomar Observatory, San Diego County, California 
Answer:
 person: Cornelis Johannes van Houten; person: Ingrid van Houten-Groeneveld; person: Tom Gehrels; organization: Palomar Observatory; location: San Diego County; location: California