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reclassified as an asteroid; Uranus, the eleventh planet from the Sun upon Vesta's discovery, though this was quickly superseded by new discoveries; or Haumea, which would be the eleventh planet if the classification advocated by
Solar Submillimeter Telescope the Argentinian National Scientific and Technical Research Council (CONICET) and the Brazilian Universidade Presbiteriana Mackenzie. Solar Submillimeter Telescope The Solar Submillimeter Telescope (SST) is a solar dedicated instrument with the aim to study the radiation produced by high-energy particles during solar flares. Observing at 212 and 405 GHz with a focal array since 2001, it is a unique instrument that has produced a wealth of new information. "Some of its discoveries are still unexplained by current theories". SST construction started in 1995, and it saw the "first light" in April 1999; since April 2001 it operates on a daily basis.