Input (grade 8): External links Data on (87) Sylvia from Johnston's archive (maintained by W. R. Johnston) Hubble Finds New Asteroid Moon (SpaceDaily.com, 21-03-2001), includes discovery image.
Output (grade 8): References Other websites Data on (87) Sylvia from Johnston's archive (maintained by W. R. Johnston) Hubble Finds New Asteroid Moon (SpaceDaily.com, 21-03-2001), includes discovery image.