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At a distance of about 6.5 light years , the nearest known brown dwarf is Luhman 16 , a binary system of brown dwarfs discovered in 2013 .
 astronomical object: Luhman 16
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: Luhman 16 
Answer:
 astronomical object: Luhman 16