value	quality	siderealorsynodic	author	ref	method
18.9580		Synodic	McNeill	2021PSJ.....2....6M	Lightcurve
18.9670	2	Synodic	Waszczak	2015AJ....150...75W	Lightcurve
18.9950	3	Synodic	Mottola	2011AJ....141..170M	Lightcurve