value quality siderealorsynodic author ref method 5.7775 2 Sidereal Durech 2023A&A...675A..24D Model 5.7776 2 Sidereal Durech 2018A&A...617A..57D Model 5.7800 2 Synodic Waszczak 2015AJ....150...75W Lightcurve