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However, Pluto is also protected by its 2:3 orbital resonance with Neptune: for every two orbits that Pluto makes around the Sun, Neptune makes three, in a frame of reference that rotates at the rate that Pluto's perihelion precesses (about 0.97 × 10 −4 degrees per year [90]). Each cycle lasts about 495 years.
The motions of Orcus (in grey) and Pluto (in red) in a rotating frame with a period equal to Neptune's orbital period (holding Neptune stationary) Pluto and its moons (top) compared in size, albedo and colour with Orcus, 2003 AZ 84, and Ixion. The 2:3 resonance at 39.4 AU is by far the dominant category among the resonant objects.
Conjunctions of d and e, e and b, b and c, and c and g occur at relative intervals of 2:3:6:6 (9.07, 13.61 and 27.21 days) in a pattern that repeats about every 190.5 days (seven full cycles in the rotating frame) in the inertial or nonrotating frame (equivalent to a 62:41:27:20:13 orbit ratio resonance in the nonrotating frame, because the ...
The body must orbit its host star, just as Earth and Jupiter orbit the sun. It is large enough to be mostly round. It must have an important influence on the orbital stability of the other objects ...
This is a list of trans-Neptunian objects (TNOs), which are minor planets in the Solar System that orbit the Sun at a greater distance on average than Neptune, that is, their orbit has a semi-major axis greater than 30.1 astronomical units (AU). The Kuiper belt, scattered disk, and Oort cloud are three conventional divisions of this volume of ...
Objects in this resonance complete 2 orbits for every 3 of Neptune, and are known as plutinos because the largest of the known Kuiper belt objects, Pluto, is among them. [148] Although Pluto crosses Neptune's orbit regularly, the 2:3 resonance makes it so that they can never collide. [149] The 3:4, 3:5, 4:7 and 2:5 resonances are less populated ...
It may also refer to the time it takes a satellite orbiting a planet or moon to complete one orbit. For celestial objects in general, the orbital period is determined by a 360° revolution of one body around its primary, e.g. Earth around the Sun. Periods in astronomy are expressed in units of time, usually hours, days, or years.
A total of five planets are going retrograde between May and September: Mercury, Saturn, Uranus, Neptune and Pluto. "Retrograde" is a term used to describe when a planet's orbit appears to slow.