value quality siderealorsynodic author ref method 13.8890 2 Synodic Waszczak 2015AJ....150...75W Lightcurve 13.9100 2 Synodic Chang 2015ApJS..219...27C Lightcurve 13.9201 2 Sidereal Durech 2023A&A...675A..24D Model