value quality siderealorsynodic author ref method 20.9285 2 Synodic Pal 2020ApJS..247...26P Lightcurve 3.6196 Synodic Pravec 2016Icar..267..267P Lightcurve 3.6196 3 Synodic Kusnirak 2008CBET.1339....1K Lightcurve 3.6198 3 Synodic Pravec LCDB Lightcurve