value	quality	siderealorsynodic	author	ref	method
18.3096	2	Sidereal	Durech	2020A&A...643A..59D	Model
18.3100	3	Synodic	Warner	2011MPBu...38..142W	Lightcurve
18.3120	3-	Synodic	Warner	2008MPBu...35...95W	Lightcurve
18.3160	3	Synodic	Warner	2016MPBu...43...57W	Lightcurve