69504
The NASA Orbital Debris Observatory tracked space debris with a liquid mirror transit telescope .
 location: NASA Orbital Debris Observatory
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: NASA Orbital Debris Observatory 
Answer:
 location: NASA Orbital Debris Observatory