value quality siderealorsynodic author ref method 6.3196 2 Synodic Pal 2020ApJS..247...26P Lightcurve 6.3204 2 Sidereal Durech 2020A&A...643A..59D Model 6.3210 3 Synodic Sauppe 2007MPBu...34..119S Lightcurve