value	quality	siderealorsynodic	author	ref	method
31.2370	2	Synodic	McNeill	2019ApJS..245...29M	Lightcurve
31.2708	2	Sidereal	Durech	2019A&A...631A...2D	Model
31.2720	2	Sidereal	Durech	2023A&A...675A..24D	Model