value quality siderealorsynodic author ref method 17.7400 2- Synodic Ruthroff 2012MPBu...39...39R Lightcurve 38.3100 2+ Synodic Polakis 2021MPBu...48..158P Lightcurve 38.4856 2 Sidereal Durech 2019A&A...631A...2D Model 38.4860 2 Sidereal Durech 2023A&A...675A..24D Model