value quality siderealorsynodic author ref method 137.0690 2 Synodic Pal 2020ApJS..247...26P Lightcurve 137.5660 2 Synodic Waszczak 2015AJ....150...75W Lightcurve 138.2800 2 Sidereal Athanasopoulos 2022A&A...666A.116A Model