value	unc_up	unc_lo	author	ref	method
6.67	nan	nan	Stephens	2020MPBu...47..275S	Lightcurve
6.68	nan	nan	Warner	2011MPBu...38...25W	Lightcurve
6.69	nan	nan	Waszczak	2015AJ....150...75W	Lightcurve