value quality siderealorsynodic author ref method 10.8200 2 Synodic Waszczak 2015AJ....150...75W Lightcurve 10.8282 2 Sidereal Durech 2020A&A...643A..59D Model 10.8290 3 Synodic Benishek 2015MPBu...42..143B Lightcurve