value quality siderealorsynodic author ref method 236.1800 2 Sidereal Durech 2019A&A...631A...2D Model 236.1849 2 Sidereal Martikainen 2021A&A...649A..98M Model 241.1910 2 Synodic Pal 2020ApJS..247...26P Lightcurve