value quality siderealorsynodic author ref method 12.0000 1+ Synodic Behrend LCDB Lightcurve 16.0000 2- Synodic Behrend LCDB Lightcurve 21.4000 1 Synodic Behrend LCDB Lightcurve 39.6658 2 Synodic Pal 2020ApJS..247...26P Lightcurve 39.6970 2 Sidereal Durech 2020A&A...643A..59D Model 39.6980 2 Sidereal Durech 2023A&A...675A..24D Model 39.7220 2 Synodic Galad 2008MPBu...35...17G Lightcurve