value quality siderealorsynodic author ref method 3.9690 2 Synodic Behrend LCDB Lightcurve 3.9900 2- Synodic Behrend LCDB Lightcurve 4.1454 3 Synodic Pravec LCDB Lightcurve 4.1457 3 Synodic Pravec LCDB Lightcurve