value quality siderealorsynodic author ref method 6.4600 3 Synodic Brinsfield 2008MPBu...35..119B Lightcurve 6.4709 3 Synodic Chiorny 2011P&SS...59.1482C Lightcurve 6.4709 3 Synodic Pravec LCDB Lightcurve