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Chi Cygni was identified in 1686 by G. Kirch , then R Hydrae in 1704 by G. D. Maraldi .
 astronomical object: Chi Cygni; person: G. Kirch; astronomical object: R Hydrae; person: G. D. Maraldi
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
 Entities: Chi Cygni, G. Kirch, R Hydrae, G. D. Maraldi 
Answer:
 astronomical object: Chi Cygni; person: G. Kirch; astronomical object: R Hydrae; person: G. D. Maraldi