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Follow-up observations were conducted by a European and American science team at the 1.2 m Leonhard Euler Telescope at La Silla Observatory in Chile , which further raised the possibility of the existence of a planet in WASP-15 's orbit ; use of the CORALIE spectrograph on the Euler Telescope between March 6 , 2008 and July 17 , 2008 revealed that the variations in radial velocity measurements were not because of an eclipsing binary star system .
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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:
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