value unc_up unc_lo author ref method 1.4700e+18 6.9000e+17 6.9000e+17 Fienga 2011CeMDA.111..363F Ephem 1.6400e+18 nan nan Folkner 2014IPNPR.196C...1F Ephem 8.2400e+17 nan nan Folkner 2009IPNPR.178C...1F Ephem 8.6867e+17 4.0314e+17 4.0314e+17 Fienga INPOP19a Ephem