value	quality	siderealorsynodic	author	ref	method
21.4000	2+	Synodic	Ditteon	2019MPBu...46..280D	Lightcurve
21.4669	2	Sidereal	Durech	2020A&A...643A..59D	Model
21.4890	2	Synodic	McNeill	2019ApJS..245...29M	Lightcurve