value quality siderealorsynodic author ref method 36.6990 2+ Synodic Stephens 2014MPBu...41..171S Lightcurve 42.7000 1 Synodic Skiff 2023MPBu...50...74S Lightcurve 8.0000 1 Synodic Wisniewski 1997Icar..126..395W Lightcurve