value quality siderealorsynodic author ref method 16.3610 2+ Synodic Behrend LCDB Lightcurve 9.8073 2 Sidereal Hanus 2016A&A...586A.108H Model 9.8100 2 Synodic Barucci 1994Icar..109..267B Lightcurve 9.8110 2 Synodic Dotto 1992LIACo..30..211D Lightcurve