value quality siderealorsynodic author ref method 8.2998 2 Sidereal Durech 2020A&A...643A..59D Model 8.2999 2 Sidereal Durech 2023A&A...675A..24D Model 8.3025 3 Synodic Molnar 2008MPBu...35....9M Lightcurve