value quality siderealorsynodic author ref method 19.1600 2 Synodic Stephens 2013MPBu...40...34S Lightcurve 19.2264 2 Sidereal Durech 2016A&A...587A..48D Model 32.1201 2 Synodic Devogele 2017A&A...607A.119D Lightcurve