value quality siderealorsynodic author ref method 3.1870 2 Synodic Waszczak 2015AJ....150...75W Lightcurve 3.1900 2 Synodic Chang 2015ApJS..219...27C Lightcurve 3.1980 2 Synodic Waszczak 2015AJ....150...75W Lightcurve