value quality siderealorsynodic author ref method 2.2500 Synodic Erasmus 2019ApJS..242...15E Lightcurve 2.6700 Synodic Erasmus 2018ApJS..237...19E Lightcurve 2.6700 2 Synodic Erasmus 2019ApJS..242...15E Lightcurve 3.3700 2 Synodic Chang 2019ApJS..241....6C Lightcurve