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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.
On 1 September 1979, Pioneer 11 passed within 13,000 mi (21,000 km) of the planet's cloud tops at a speed of 71,000 mph (114,000 km/h). An animation of a sequence of images taken by the Voyager 1 probe of the planet Jupiter. One frame was taken every Jupiter day, about 10 hours, from 1 June 1979 to 2 March 1979, giving 66 frames in all. [3]
The time spent in the quasi-satellite phase differs from asteroid to asteroid. Quasi-satellite 2016 HO 3 is predicted to be stable in this orbital state for several hundred years, in contrast to 2003 YN 107 which was a quasi-satellite from 1996 to 2006 but then departed Earth's vicinity on a horseshoe orbit. [8] [10]
The average distance between Neptune and the Sun is 4.5 billion km (about 30.1 astronomical units (AU), the mean distance from the Earth to the Sun), and it completes an orbit on average every 164.79 years, subject to a variability of around ±0.1 years. The perihelion distance is 29.81 AU, and the aphelion distance is 30.33 AU.
Five planets are going to be retrograde in the summer of 2024. Here are the dates for Mercury retrograde, Venus retrograde, Saturn retrograde, Neptune retrograde, Pluto retrograde and more.
Earth: 0.99726968 days [3] [iii] 0 d 23 h 56 m 4.0910 s: 1.00 days (24 h 00 m 00 s) Moon: 27.321661 days [7] (equal to sidereal orbital period due to spin-orbit locking, a sidereal lunar month) 27 d 7 h 43 m 11.5 s: 29.530588 days [7] (equal to synodic orbital period, due to spin-orbit locking, a synodic lunar month) none (due to spin-orbit ...
While the majority of plutinos have relatively low orbital inclinations, a significant fraction of these objects follow orbits similar to that of Pluto, with inclinations in the 10–25° range and eccentricities around 0.2–0.25; such orbits result in many of these objects having perihelia close to or even inside Neptune's orbit, while ...
Galileo [9] [10] discovered the Galilean moons. These satellites were the first celestial objects that were confirmed to orbit an object other than the Sun or Earth. Galileo saw Io and Europa as a single point of light on 7 January 1610; they were seen as separate bodies the following night. [11] Callisto: Jupiter IV o: 8 January 1610 p: 13 ...