value	unc_up	unc_lo	author	ref	method
1.2640e+18	3.8118e+17	3.8118e+17	Fienga	INPOP19a	Ephem
1.3500e+18	nan	nan	Folkner	2009IPNPR.178C...1F	Ephem
2.4100e+18	nan	nan	Folkner	2014IPNPR.196C...1F	Ephem