value quality siderealorsynodic author ref method 30.2810 2 Sidereal Durech 2023A&A...675A..24D Model 31.0000 2 Synodic Dahlgren 1998Icar..133..247D Lightcurve 59.3600 2+ Synodic Warner 2017MPBu...44..130W Lightcurve