value	quality	siderealorsynodic	author	ref	method
21.3300	2+	Synodic	Pravec	LCDB	Lightcurve
21.5990	2	Sidereal	Durech	2023A&A...675A..24D	Model
21.6308	2	Synodic	Pal	2020ApJS..247...26P	Lightcurve