value	quality	siderealorsynodic	author	ref	method
19.9680	2	Synodic	Waszczak	2015AJ....150...75W	Lightcurve
19.9700	2	Sidereal	Durech	2023A&A...675A..24D	Model
20.0000	2	Synodic	Chang	2015ApJS..219...27C	Lightcurve