value quality siderealorsynodic author ref method 7.3540 2 Synodic Pal 2020ApJS..247...26P Lightcurve 7.3555 2 Sidereal Durech 2018A&A...617A..57D Model 7.3640 3 Synodic Yeung 2004MPBu...31...81Y Lightcurve