value	unc_up	unc_lo	author	ref	method
1.2108e+18	6.0359e+17	6.0359e+17	Fienga	INPOP19a	Ephem
1.7400e+18	nan	nan	Folkner	2014IPNPR.196C...1F	Ephem
4.5900e+18	7.4200e+18	7.4200e+18	Zielenbach	2011AJ....142..120Z	Deflec