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In February 2011 , a rotational lightcurve of " Walküre " was obtained from photometric observations by astronomer Li Bin at the XuYi Station of the Purple Mountain Observatory in China .
 location: Walküre; person: Li Bin; location: XuYi Station; location: Purple Mountain Observatory; location: China
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 location: Walküre; person: Li Bin; location: XuYi Station; location: Purple Mountain Observatory; location: China