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The first object , Ceres , was not discovered by a member of the group , but rather by accident in 1801 by Giuseppe Piazzi , director of the observatory of Palermo in Sicily .
 Ceres, Giuseppe Piazzi, Palermo, Sicily
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:
 Ceres, Giuseppe Piazzi, Palermo, Sicily