value quality siderealorsynodic author ref method 4.6544 2 Sidereal Athanasopoulos 2022A&A...666A.116A Model 4.6544 2 Sidereal Hanus 2016A&A...586A.108H Model 4.6580 3 Synodic Higgins 2008MPBu...35...30H Lightcurve