value quality siderealorsynodic author ref method 12.0000 1 Synodic Behrend LCDB Lightcurve 17.4462 2 Sidereal Durech 2016A&A...587A..48D Model 17.4463 2 Sidereal Durech 2023A&A...675A..24D Model 17.4470 3 Synodic Behrend LCDB Lightcurve 17.4470 3 Synodic Galad 2009MPBu...36..116G Lightcurve