value	quality	siderealorsynodic	author	ref	method
20.8894	2	Sidereal	Hanus	2013A&A...551A..67H	Model
20.8895	2	Sidereal	Martikainen	2021A&A...649A..98M	Model
20.9180	3-	Synodic	Warner	2007MPBu...34...72W	Lightcurve