286508
It was discovered by Antonín Mrkos at Kleť Observatory in the Czech Republic on April 19 , 1984 .
 Antonín Mrkos, Czech Republic
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Antonín Mrkos, Czech Republic