value	unc_up	unc_lo	author	ref	method
1.9884e+15	nan	nan	Fienga	2013arXiv1301.1510F	Ephem
2.8000e+18	nan	nan	Folkner	2014IPNPR.196C...1F	Ephem
3.1605e+18	7.2560e+17	7.2560e+17	Fienga	INPOP19a	Ephem