value quality siderealorsynodic author ref method 11.5140 3 Synodic Ditteon 2011MPBu...38..214D Lightcurve 11.5172 2 Sidereal Durech 2016A&A...587A..48D Model 11.5200 2 Synodic Waszczak 2015AJ....150...75W Lightcurve