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A critical-list minor planet (critical list numbered object or critical object) is a numbered minor planet for which existing measurements of the orbit and position are especially in need of improvement. [1] The IAU's Minor Planet Center (MPC) regularly publishes a list of these critical objects in their Minor Planet Electronic Circular. [2]
An inclination of 63.4° is often called a critical inclination, when describing artificial satellites orbiting the Earth, because they have zero apogee drift. [ 3 ] An inclination of exactly 90° is a polar orbit , in which the spacecraft passes over the poles of the planet.
The orbit of every planet is an ellipse with the Sun at one of the foci. A line joining a planet and the Sun sweeps out equal areas during equal intervals of time. The squares of the orbital periods of planets are directly proportional to the cubes of the semi-major axis of the orbits.
Critical Path is a book written by US author and inventor R. Buckminster Fuller with the assistance of Kiyoshi Kuromiya.First published in 1981, it is alongside Operating Manual for Spaceship Earth one of Fuller's best-known works.
According to the IAU's explicit count, there are eight planets in the Solar System; four terrestrial planets (Mercury, Venus, Earth, and Mars) and four giant planets, which can be divided further into two gas giants (Jupiter and Saturn) and two ice giants (Uranus and Neptune). When excluding the Sun, the four giant planets account for more than ...
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 ...
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The orbit of a planet is an ellipse with the Sun at one of the two foci. A line segment joining a planet and the Sun sweeps out equal areas during equal intervals of time. The square of a planet's orbital period is proportional to the cube of the length of the semi-major axis of its orbit.