value	unc_up	unc_lo	author	ref	method
1.2940e+18	5.2000e+17	5.2000e+17	Fienga	2020MNRAS.492..589F	Ephem
3.9909e+18	1.7896e+18	1.7896e+18	Fienga	2013arXiv1301.1510F	Ephem
4.2000e+17	nan	nan	Folkner	2014IPNPR.196C...1F	Ephem