value quality siderealorsynodic author ref method 3.6074 2 Sidereal Durech 2018A&A...617A..57D Model 3.6075 2 Sidereal Durech 2019A&A...631A...2D Model 3.6130 3 Synodic Florczak 1997P&SS...45.1423F Lightcurve