value quality siderealorsynodic author ref method 16.3088 2 Sidereal Durech 2020A&A...643A..59D Model 16.3090 2 Sidereal Durech 2023A&A...675A..24D Model 16.3500 2 Synodic Moravec 2012MPBu...39..213M Lightcurve