value quality siderealorsynodic author ref method 10.4500 3 Synodic Binzel 1987Icar...72..135B Lightcurve 10.4890 3 Synodic Slivan 2008Icar..195..226S Lightcurve 10.4896 2 Sidereal Hanus 2011A&A...530A.134H Model