value quality siderealorsynodic author ref method 34.6676 2 Synodic Pal 2020ApJS..247...26P Lightcurve 7.4560 2+ Synodic Warner 2017MPBu...44..331W Lightcurve 7.4900 2 Synodic Warner 2021MPBu...48...40W Lightcurve