Eleventh planet term "planet" was redefined to exclude the new category of dwarf planets (just as some planets had earlier been recategorised as asteroids). In 2006 Pluto, Eris, Haumea, Makemake, and (in the inner Solar System) the asteroid Ceres were reclassified as dwarf planets. Eleventh planet Eleventh planet (of the Solar System) may refer to Vesta, the eleventh object to be named a planet, later to be reclassified as an asteroid; Uranus, the eleventh planet from the Sun upon Vesta's discovery, though this was quickly superseded by new discoveries; or Haumea, which would be the eleventh planet if the classification advocated by
Goode Solar Telescope in order to reduce the solar heat load on subsequent optics. The GST is mounted on an equatorial mount made by DFM Engineering inside a ventilated dome resembling 5/8 of a sphere. The Goode Solar Telescope deploys adaptive optical systems to mitigate image blur caused by atmospheric turbulence. The system AO308 is routinely used for the vast majority of observations and serves all post-focus instruments expect of CYRA. AO308 is a "classical" adaptive optics system. It uses a Shack–Hartmann wavefront sensor that measures the average wavefront aberration over a field of view of 10 arcseconds and a single deformable mirror