value quality siderealorsynodic author ref method 2.2856 3 Synodic Pray 2006CBET..414....1P Lightcurve 2.2856 3 Synodic Pravec 2012Icar..218..125P Lightcurve 2.2856 3 Synodic Pravec 2012Icar..218..125P Lightcurve