value quality siderealorsynodic author ref method 38.4666 2 Sidereal Durech 2018A&A...617A..57D Model 38.4870 2 Synodic Waszczak 2015AJ....150...75W Lightcurve 38.5410 2 Synodic Waszczak 2015AJ....150...75W Lightcurve