value quality siderealorsynodic author ref method 5.3890 2- Synodic Erasmus 2020ApJS..247...13E Lightcurve 6.0717 2 Sidereal Hanus 2013A&A...551A..67H Model 6.0724 2+ Synodic Molnar 2008MPBu...35....9M Lightcurve