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The International Astronomical Union (IAU) at the IAU 2006 General Assembly held on August 24,2006, in prague in Czech Rebulic, adopted anew definition of planets in our Solar System. According to the new definition,Pluto is no longer a planet. This means that the solar system consists of eight planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. According to the IAU usage, the 'planet' and other bodies' in our solar system, except satellites, are to be defined into three distinct categories of celestial objects in the following way :
1. A'planet' 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 cleard the neighbourhood around its orbit.
2. A'dwarf planet' 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, (c) has cleared the neighbourhood around its orbit, and (d) is not a satellite.
3. All 'other objects', except satellites, orbiting the sun, shall be referred to collectively as 'Small Solar-System Bodies'.
Unlike other eight planets in the solar system, Pluto's orbital path overlaps with 'other objects' and the planet Neptune. The 'other objects' currently include most of the solar system asteroids, most of the Trans-Neptunian Objects (TNOs), comets, and other small bodies.
Pluto is a 'dwarf planet' by the above definition and is recognised as the prototype of a new category of Trans-Neptunian Objects.
The International Astronomical Union (IAU) at the IAU 2006 General Assembly held on August 24,2006, in prague in Czech Rebulic, adopted anew definition of planets in our Solar System. According to the new definition,Pluto is no longer a planet. This means that the solar system consists of eight planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. According to the IAU usage, the 'planet' and other bodies' in our solar system, except satellites, are to be defined into three distinct categories of celestial objects in the following way :
1. A'planet' 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 cleard the neighbourhood around its orbit.
2. A'dwarf planet' 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, (c) has cleared the neighbourhood around its orbit, and (d) is not a satellite.
3. All 'other objects', except satellites, orbiting the sun, shall be referred to collectively as 'Small Solar-System Bodies'.
Unlike other eight planets in the solar system, Pluto's orbital path overlaps with 'other objects' and the planet Neptune. The 'other objects' currently include most of the solar system asteroids, most of the Trans-Neptunian Objects (TNOs), comets, and other small bodies.
Pluto is a 'dwarf planet' by the above definition and is recognised as the prototype of a new category of Trans-Neptunian Objects.
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