value quality siderealorsynodic author ref method 6.0433 2 Sidereal Durech 2020A&A...643A..59D Model 6.0433 2 Sidereal Durech 2023A&A...675A..24D Model 6.0560 3 Synodic Behrend LCDB Lightcurve 6.1800 3- Synodic Behrend LCDB Lightcurve