value quality siderealorsynodic author ref method 10.8070 3 Synodic Stephens 2015MPBu...42..279S Lightcurve 10.8169 2 Sidereal Durech 2020A&A...643A..59D Model 10.8190 2 Synodic Waszczak 2015AJ....150...75W Lightcurve