value	unc_up	unc_lo	author	ref	method
1.4530e+18	6.0200e+17	6.0200e+17	Fienga	2020MNRAS.492..589F	Ephem
1.9000e+18	6.3700e+17	6.3700e+17	Fienga	2011CeMDA.111..363F	Ephem
6.7400e+17	nan	nan	Folkner	2014IPNPR.196C...1F	Ephem