value quality siderealorsynodic author ref method 0.8700 Synodic Erasmus 2018ApJS..237...19E Lightcurve 0.8700 Synodic Erasmus 2019ApJS..242...15E Lightcurve 13.4820 2 Synodic Waszczak 2015AJ....150...75W Lightcurve