value quality siderealorsynodic author ref method 13.9487 2 Synodic Pal 2020ApJS..247...26P Lightcurve 13.9650 3- Synodic Warner 2007MPBu...34...32W Lightcurve 13.9790 2 Synodic McNeill 2019ApJS..245...29M Lightcurve