value	quality	siderealorsynodic	author	ref	method
18.0900	2	Synodic	Waszczak	2015AJ....150...75W	Lightcurve
18.1093	2	Sidereal	Durech	2019A&A...631A...2D	Model
18.2000	2	Synodic	French	2012MPBu...39..183F	Lightcurve