value quality siderealorsynodic author ref method 5.3969 2 Sidereal Durech 2023A&A...675A..24D Model 5.3970 2 Synodic Waszczak 2015AJ....150...75W Lightcurve 5.4200 2 Synodic Chang 2015ApJS..219...27C Lightcurve