value quality siderealorsynodic author ref method 10.1300 2+ Synodic Polakis 2021MPBu...48..158P Lightcurve 10.1310 2+ Synodic Stephens 2021MPBu...48..150S Lightcurve 12.9810 2 Synodic Ferrero 2021MPBu...48..115F Lightcurve