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During the sixteenth century , astronomer Tycho Brahe observed the supernova SN 1572 in the constellation Cassiopeia .
 person: Tycho Brahe; astronomical object: supernova; astronomical object: SN 1572; astronomical object: Cassiopeia
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: Tycho Brahe, supernova, SN 1572, Cassiopeia 
Answer:
 person: Tycho Brahe; astronomical object: supernova; astronomical object: SN 1572; astronomical object: Cassiopeia