value	quality	siderealorsynodic	author	ref	method
6.8500	2	Synodic	Waszczak	2015AJ....150...75W	Lightcurve
6.8520	2	Sidereal	Durech	2018A&A...617A..57D	Model
6.8520	2	Sidereal	Martikainen	2021A&A...649A..98M	Model
6.8530	2	Synodic	Pal	2020ApJS..247...26P	Lightcurve