value	quality	siderealorsynodic	author	ref	method
18.2947	3-	Synodic	Owings	2013MPBu...40....8O	Lightcurve
18.2970	3	Synodic	Stephens	2021MPBu...48..246S	Lightcurve
18.3100	2	Synodic	Behrend	LCDB	Lightcurve