value quality siderealorsynodic author ref method 16.3640 2 Sidereal Durech 2023A&A...675A..24D Model 16.3642 2 Sidereal Durech 2020A&A...643A..59D Model 16.3700 2 Synodic Behrend LCDB Lightcurve 16.3722 3 Synodic Behrend LCDB Lightcurve