value quality siderealorsynodic author ref method 10.1461 3 Synodic Benishek 2018MPBu...45...82B Lightcurve 7.7000 1 Synodic Hayes 2011MPBu...38..204H Lightcurve 8.3700 2 Synodic Erasmus 2020ApJS..247...13E Lightcurve