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Astronomers at the Observatory of Geneva were then able to use characteristic red shift s and blue shift s in the host star 's spectrum as its radial velocity varied over the course of the planet 's orbit to measure the planet 's mass and obtain an indication of its orbital eccentricity .
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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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