value quality siderealorsynodic author ref method 5.1330 3 Synodic Stephens 2022MPBu...49..205S Lightcurve 5.1340 3 Synodic Stephens 2016MPBu...43...52S Lightcurve 5.1380 3- Synodic Stephens 2020MPBu...47..224S Lightcurve