Menoetius (moon)
It was estimated that the two components orbit around their center of mass in  days at a distance of  in a roughly circular orbit. Combining these observations with thermal measurements taken in 2000, the sizes of the components of the system were estimated at 106 km and 98 km, with an equivalent whole-system diameter of 145 km, refined by later measurements from the Keck Observatory to approximately 122 km and 112 km for each partner, and a co-orbital period of  hours ( days).