value quality siderealorsynodic author ref method 5.7345 2+ Synodic Pilcher 2013MPBu...40..194P Lightcurve 5.7348 3 Synodic Pilcher 2016MPBu...43..222P Lightcurve 5.7349 2 Sidereal Durech 2020A&A...643A..59D Model