value quality siderealorsynodic author ref method 2.5577 2 Sidereal Durech 2019A&A...631A...2D Model 2.5577 2 Sidereal Durech 2023A&A...675A..24D Model 2.5580 2 Synodic Waszczak 2015AJ....150...75W Lightcurve