value quality siderealorsynodic author ref method 2.8550 1 Synodic Skiff LCDB Lightcurve 2.8550 3 Synodic Skiff LCDB Lightcurve 2.8560 2 Synodic Skiff 2023MPBu...50...74S Lightcurve 2.8600 1 Synodic Skiff 2023MPBu...50...74S Lightcurve