value	quality	siderealorsynodic	author	ref	method
21.6600	3-	Synodic	Warner	2012MPBu...39...16W	Lightcurve
21.6704	2	Sidereal	Hanus	2016A&A...586A.108H	Model
21.6707	2	Sidereal	Martikainen	2021A&A...649A..98M	Model
21.6900	3	Synodic	Behrend	LCDB	Lightcurve
21.7000	2	Synodic	Behrend	LCDB	Lightcurve