value quality siderealorsynodic author ref method 3.6360 2+ Synodic Skiff LCDB Lightcurve 3.6400 2+ Synodic Skiff 2019MPBu...46..458S Lightcurve 3.7800 2 Synodic Behrend LCDB Lightcurve 3.7800 2 Synodic Behrend LCDB Lightcurve