value quality siderealorsynodic author ref method 7.7680 3 Synodic Bembrick 2001MPBu...28...68B Lightcurve 7.7690 3 Synodic Behrend LCDB Lightcurve 7.7701 2 Sidereal Durech 2020A&A...643A..59D Model 7.7706 2 Sidereal Durech 2023A&A...675A..24D Model