value quality siderealorsynodic author ref method 6.2480 2 Synodic Waszczak 2015AJ....150...75W Lightcurve 6.2498 2 Sidereal Durech 2023A&A...675A..24D Model 7.1880 2- Synodic Erasmus 2020ApJS..247...13E Lightcurve