value quality siderealorsynodic author ref method 5.9940 2 Synodic Waszczak 2015AJ....150...75W Lightcurve 5.9940 2 Sidereal Durech 2023A&A...675A..24D Model 6.8500 2 Synodic Erasmus 2020ApJS..247...13E Lightcurve