value quality siderealorsynodic author ref method 266.5300 2 Sidereal Durech 2019A&A...631A...2D Model 266.6000 2 Sidereal Durech 2023A&A...675A..24D Model 268.7520 2 Synodic Waszczak 2015AJ....150...75W Lightcurve