value quality siderealorsynodic author ref method 24.2500 2 Synodic Durkee 2018MPBu...45..333D Lightcurve 77.9380 2 Sidereal Durech 2019A&A...631A...2D Model 78.6400 2 Synodic Erasmus 2020ApJS..247...13E Lightcurve