Noun

(en noun)

(astronomy) An asteroid of any size

* {{quote-book

, year=1856 , author=Robert James Mann , site= , title=A guide to astromomical science , page=231 , passage=The group of small bodies that circle round the Sun, outside the orbit of Mars, are known under the designation of ''the planetoids .}}

* {{quote-journal

, year=1859 , author=J.D. & E.S. Dana , site= , title= , journal=The American journal of science , volume= , date= , page=153 , passage=Numbering of the Planetoids''' or Asteroidal Planets.''—In numbering the ' planetoids a difficulty has arisen [...]}}

* 1979' ''Tsunami generation by pelagic '''planetoid impact

* {{quote-journal

, year=1979 , author=H.A. Zook , site= , title=On a New Model for the Generation of Chondrites , journal=Lunar and Planetary Science , volume=xii , date= , page=1242 , passage=if one can argue for the early existence of a few largely molten planetoids' with dimension of kilometers or tens of kilometers, one can quite as easily argue for very large numbers of such ' planetoids .}}

(astronomy) An asteroid-like body in an orbit beyond the asteroid belt, such as a centaur or Kuiper belt object

(astronomy) A larger, planetary, body in orbit around the Sun, such as Vesta or (candidate) dwarf planets such Eris or Sedna

* 1991' ''Optimal trajectories for an ion driven spacecraft from earth to the '''planetoid Vesta

* {{quote-book

, year=2009 , author=Paul A. Czysz, Claudio Bruno , site= , title=Future Spacecraft Propulsion Systems , publisher= , page=377–378 , passage=After discovering "planetoids'", bodies orbiting the Sun, even larger than Pluto's moon Charon ... the question of how Sedna and other ' planetoids came to be.}}

* {{quote-book

, year=2009 , author=Patricia Daniels, Robert Burnham , site= , title=The New Solar System: Ice Worlds, Moons, and Planets Redefined , publisher=National Geographic Books , page=173 , passage=Eris [...] was the upstart planetoid that knocked Pluto off the planetary lists}}

(astronomy) A dwarf planet

* {{quote-book

, year=2007 , author= , editor=Hannu Karttunen et al. , title=Fundamental Astronomy , edition=5 , publisher= , page=131 , passage=A dwarf planet'' or a ''planetoid is a celestial body that [...] }}

* {{quote-book

, year=2010 , author=Mike Brown , editor= , title=How I Killed Pluto and Why It Had It Coming , edition= , publisher= , page=223 , passage='Dwarf planet' is a dumb phrase. For years we've called things like Pluto and Xena 'planetoids'—planetlike. }}