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Shortly after Giuseppe Piazzi 's discovery of Ceres , a group of astronomers ratified the name , proposed by the discoverer , and chose the sickle as a symbol of the planet .
 Giuseppe Piazzi, Ceres
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Giuseppe Piazzi, Ceres