value quality siderealorsynodic author ref method 5.7231 2 Synodic Pal 2020ApJS..247...26P Lightcurve 5.7233 2 Sidereal Durech 2020A&A...643A..59D Model 5.7350 3 Synodic Stephens 2019MPBu...46..449S Lightcurve