ハーシェル宇宙望遠鏡
According to observations made by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, ESA's Herschel Space Observatory with its PACS instrument, and the Spitzer Space Telescope, "Thereus" measures between 62 and 86.5 kilometers in diameter and its surface has an albedo between 0.059 and 0.0975.