value quality siderealorsynodic author ref method 15.6593 2 Sidereal Durech 2016A&A...587A..48D Model 15.6596 2 Sidereal Durech 2023A&A...675A..24D Model 15.6600 2 Synodic Behrend LCDB Lightcurve 15.6600 3 Synodic Behrend LCDB Lightcurve 15.7000 2- Synodic Behrend LCDB Lightcurve