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The result for each planet is an orbit, a simple description of its position as function of time. Once this is solved the influences moons and planets have on each other are added as small corrections. These are small compared to a full planetary orbit.
Counter-Earth, a planet situated on the other side of the Sun from that of the Earth. Fifth planet (hypothetical), historical speculation about a planet between the orbits of Mars and Jupiter. Phaeton, a planet situated between the orbits of Mars and Jupiter whose destruction supposedly led to the formation of the asteroid belt. This hypothesis ...
The radii of these objects range over three orders of magnitude, from planetary-mass objects like dwarf planets and some moons to the planets and the Sun. This list does not include small Solar System bodies , but it does include a sample of possible planetary-mass objects whose shapes have yet to be determined.
The JPL ephemerides are widely used for planetary science; some examples are included in the Notes and References. Software is available to use the JPL ephemerides for the production of apparent ephemerides for any location and time; these are widely used by professional and amateur astronomers for reducing planetary observations and producing ...
A planet that directly orbits a black hole. Carbon planet: A terrestrial planet composed primarily of carbon, rather than silicon. Chthonian planet: A hot Jupiter whose outer layers have been completely stripped off by its parent star. Chlorine planet: A planet with significant amounts of free chlorine or hydrochloric acid. [2] Coreless planet
For planet Earth, which can be approximated as an oblate spheroid with radii 6 378.1 km and 6 356.8 km, the mean radius is = (( ) ) / = . The equatorial and polar radii of a planet are often denoted r e {\displaystyle r_{e}} and r p {\displaystyle r_{p}} , respectively.
A fundamental ephemeris of the Solar System is a model of the objects of the system in space, with all of their positions and motions accurately represented. It is intended to be a high-precision primary reference for prediction and observation of those positions and motions, and which provides a basis for further refinement of the model.
Planet c is possibly a potentially habitable Super-Earth but is probably too hot or massive. [55] [56] Mu Arae: Ara: 17 h 44 m 08.70 s: −51° 50′ 02.6″ 5.15: 51: G3IV-V: 1.077: 5704: 6.413: 4: Planet Quijote orbits in the circumstellar habitable zone. However, it is a gas giant, so it itself is uninhabitable although a large moon orbiting ...