value quality siderealorsynodic author ref method 2.5294 3 Synodic Pravec 2010Natur.466.1085P Lightcurve 2.5321 2 Synodic Pravec 2019Icar..333..429P Lightcurve 2.5327 3 Synodic Pravec 2021CBET.4961....1P Lightcurve