value quality siderealorsynodic author ref method 18.8200 1+ Synodic Chang 2016ApJS..227...20C Lightcurve 77.9100 2 Sidereal Durech 2020A&A...643A..59D Model 77.9320 2 Synodic Waszczak 2015AJ....150...75W Lightcurve