Simplify the following text for a Grade 9 native English-speaking person.
Original: The 90th asteroid to be found , it is named after Antiope from Greek mythology , though it is disputed as to whether the namesake is Antiope the Amazon or Antiope the mother of Amphion and Zethus .
Simplified: The number in 90 Antiope 's name denotes that it was the 90th asteroid to be discovered . Its proper name comes from Greek mythology , though it is disputed as to whether this is Antiope the Amazon or Antiope the mother of Amphion and Zethus .