value quality siderealorsynodic author ref method 5.2476 2 Sidereal Durech 2023A&A...675A..24D Model 5.2490 2 Synodic Waszczak 2015AJ....150...75W Lightcurve 5.2498 2 Synodic Pal 2020ApJS..247...26P Lightcurve