value quality siderealorsynodic author ref method 5.6020 3 Synodic Skiff 2019MPBu...46..458S Lightcurve 5.6047 3 Synodic Skiff 2019MPBu...46..458S Lightcurve 5.6050 3 Synodic Skiff 2019MPBu...46..458S Lightcurve