62461
Coming to Caltech in 1969 , he started a systematic search for Earth orbit-crossing asteroids , which resulted in the discovery of several families of such asteroids , including the Apollo asteroids .
 Caltech
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Caltech