value quality siderealorsynodic author ref method 2.7452 3 Synodic Pravec 2012Icar..218..125P Lightcurve 2.7454 3 Synodic Higgins 2006CBET..389....1H Lightcurve 2.7454 3 Synodic Pravec 2012Icar..218..125P Lightcurve 2.7454 3 Synodic Pravec LCDB Lightcurve