value	quality	siderealorsynodic	author	ref	method
21.3610	2	Sidereal	Durech	2018A&A...620A..91D	Model
21.3630	2	Sidereal	Durech	2023A&A...675A..24D	Model
21.3640	2	Sidereal	Durech	2019A&A...631A...2D	Model
21.3660	2	Synodic	Pal	2020ApJS..247...26P	Lightcurve