value quality siderealorsynodic author ref method 12.6603 3- Synodic Benishek 2016MPBu...43..339B Lightcurve 12.6607 2 Sidereal Durech 2023A&A...675A..24D Model 12.6609 2 Sidereal Durech 2020A&A...643A..59D Model