value	quality	siderealorsynodic	author	ref	method
21.7369	2	Sidereal	Durech	2019A&A...631A...2D	Model
21.7380	2	Sidereal	Durech	2023A&A...675A..24D	Model
21.7790	3	Synodic	Simpson	2013MPBu...40..146S	Lightcurve