81745
The seventh catalogue and its annex use the same numbering scheme and insert new stars into the sequence using lower case letter suffixes , for example WR 102ka for one of the numerous WR stars discovered in the galactic centre .
 WR 102ka
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:
 WR 102ka