value unc_up unc_lo author ref method 3.2700e+17 1.3500e+17 1.3500e+17 Fienga 2020MNRAS.492..589F Ephem 1.0400e+18 5.1100e+17 5.1100e+17 Fienga 2011CeMDA.111..363F Ephem 4.8900e+17 nan nan Folkner 2014IPNPR.196C...1F Ephem