value quality siderealorsynodic author ref method 206.7400 2 Sidereal Durech 2020A&A...643A..59D Model 207.0540 2 Synodic McNeill 2019ApJS..245...29M Lightcurve 207.2540 2 Synodic Pal 2020ApJS..247...26P Lightcurve