value quality siderealorsynodic author ref method 2.8209 2 Sidereal Durech 2023A&A...675A..24D Model 2.8210 2 Synodic Waszczak 2015AJ....150...75W Lightcurve 2.8228 2 Synodic Pal 2020ApJS..247...26P Lightcurve