value quality siderealorsynodic author ref method 5.2070 2 Synodic Waszczak 2015AJ....150...75W Lightcurve 5.2070 2 Sidereal Durech 2020A&A...643A..59D Model 5.8430 2- Synodic Erasmus 2020ApJS..247...13E Lightcurve