52067
The " AB " designation , or older " A × B " , denotes the mass centre of a main binary system relative to companion star ( s ) in a multiple star system .
 binary
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:
 binary