196886
It was constructed in 1959 by Dr. Niels Palle Wieth-Knudsen ( 1909-1993 ) who used the observatory until his death .
 None
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:  
Answer:
 None