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At over two astronomical units in length , it was the longest known cometary tail until measurements in 1996 showed that Comet Hyakutake 's tail was almost twice as long .
 Comet Hyakutake
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Comet Hyakutake