value	quality	siderealorsynodic	author	ref	method
50.0700	3	Synodic	Pravec	LCDB	Lightcurve
50.1000	2	Synodic	Skiff	2019MPBu...46..458S	Lightcurve
52.5000	2-	Synodic	Oey	2014MPBu...41..276O	Lightcurve