value	unc_up	unc_lo	author	ref	method
1.3300e+18	nan	nan	Folkner	2009IPNPR.178C...1F	Ephem
1.6520e+18	5.6900e+17	5.6900e+17	Fienga	2020MNRAS.492..589F	Ephem
6.9400e+17	nan	nan	Folkner	2014IPNPR.196C...1F	Ephem