value quality siderealorsynodic author ref method 10.0253 3 Synodic Yankov 2009MPBu...36....3Y Lightcurve 10.0260 2 Sidereal Durech 2020A&A...643A..59D Model 10.0261 2 Sidereal Durech 2023A&A...675A..24D Model 9.6000 2 Synodic Behrend LCDB Lightcurve