value quality siderealorsynodic author ref method 19.1700 2 Synodic Waszczak 2015AJ....150...75W Lightcurve 19.1832 2 Sidereal Athanasopoulos 2022A&A...666A.116A Model 31.9980 2- Synodic Erasmus 2020ApJS..247...13E Lightcurve