value	quality	siderealorsynodic	author	ref	method
21.7080	2	Synodic	Waszczak	2015AJ....150...75W	Lightcurve
21.7280	2	Synodic	Waszczak	2015AJ....150...75W	Lightcurve
21.7299	2	Sidereal	Durech	2018A&A...617A..57D	Model