value quality siderealorsynodic author ref method 11.7554 3 Synodic Pilcher 2009MPBu...36...29P Lightcurve 11.7567 2 Sidereal Durech 2020A&A...643A..59D Model 11.7567 2 Sidereal Durech 2023A&A...675A..24D Model 11.8000 2 Synodic Behrend LCDB Lightcurve