value	quality	siderealorsynodic	author	ref	method
20.8668	2	Sidereal	Durech	2023A&A...675A..24D	Model
20.8678	2	Synodic	Pal	2020ApJS..247...26P	Lightcurve
20.8730	2	Synodic	McNeill	2019ApJS..245...29M	Lightcurve