value quality siderealorsynodic author ref method 10.2800 2+ Synodic Stephens 2016MPBu...43...15S Lightcurve 10.3100 2+ Synodic French 2013MPBu...40..198F Lightcurve 10.3600 2+ Synodic Stephens 2016MPBu...43..323S Lightcurve