Herschel Space Observatory
Weywot is estimated to be around in diameter, based on a stellar occultation by Weywot in 2019. Weywot was estimated to be in diameter, based on observations with the Herschel Space Observatory in 2013. Prior to the Herschel Space Observatory measurements, Weywot was measured be about 74 km ( of Quaoar) according to its apparent magnitude, under the assumption that Weywot has an equal albedo and density to Quaoar. Weywot is estimated to only have the mass of Quaoar.