value quality siderealorsynodic author ref method 3.8545 3 Synodic Pravec 2012Icar..218..125P Lightcurve 3.8545 3 Synodic Gajdos 2007CBET..910....1G Lightcurve 3.8545 3 Synodic Pravec 2012Icar..218..125P Lightcurve