value	quality	siderealorsynodic	author	ref	method
20.9864	2	Synodic	Pal	2020ApJS..247...26P	Lightcurve
20.9986	2	Sidereal	Durech	2020A&A...643A..59D	Model
20.9990	2	Sidereal	Durech	2023A&A...675A..24D	Model