value quality siderealorsynodic author ref method 15.6970 3- Synodic Moretti 2009MPBu...36...29M Lightcurve 15.7177 2 Sidereal Durech 2020A&A...643A..59D Model 24.0000 2 Synodic Chang 2015ApJS..219...27C Lightcurve