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Earth and Jupiter Join Pluto as Non-Planets?

By Keith Cowing
August 24, 2006

The IAU draft definition of ‘planet’ and ‘plutons’, IAU

“The draft “Planet Definition” Resolution will be discussed and refined during the General Assembly and then it (plus four other Resolutions) will be presented for voting at the 2nd session of the GA 24 August between 14:00 and 17:30 CEST.”

Reader (Renowned Planetary Scientist) note: IAU’s definition 5A just passed – the one that excludes Pluto as a planet. Look at the murky wording, it also excludes Earth and Jupiter because their zones are not cleared (NEOs, Trojans, respectively).

The Final IAU Resolution on the definition of “planet” ready for voting

“RESOLUTION 5A … (1) A planet1 is a celestial body that (a) is in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, and (c) has cleared the neighbourhood around its orbit.”

NASA Watch founder, Explorers Club Fellow, ex-NASA, Away Teams, Journalist, Space & Astrobiology, Lapsed climber.