value quality siderealorsynodic author ref method 13.5383 2 Synodic Pal 2020ApJS..247...26P Lightcurve 13.5772 2 Sidereal Martikainen 2021A&A...649A..98M Model 13.5775 2 Sidereal Durech 2018A&A...617A..57D Model