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Since S/2023 U 1's orbital inclination is greater than 90°, the moon has a retrograde orbit, meaning it orbits in the opposite direction of Uranus' orbit around the Sun. [5] Due to perturbations, S/2023 U 1's orbital elements fluctuate over time: its semi-major axis can range from 7.97 to 7.98 million km (4.95 to 4.96 million mi), eccentricity ...
The James Webb Space Telescope has snapped a glowing new portrait of Uranus that showcases the ice giant’s typically hidden rings, moons, weather and atmosphere — features that were nowhere to ...
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 revelations will be helpful for missions that may be planned to explore Uranus and Neptune more closely in the future, a priority for astronomers since the ice planets were only observed in ...
One particularly distant body is 90377 Sedna, which was discovered in November 2003.It has an extremely eccentric orbit that takes it to an aphelion of 937 AU. [2] It takes over 10,000 years to orbit, and during the next 50 years it will slowly move closer to the Sun as it comes to perihelion at a distance of 76 AU from the Sun. [3] Sedna is the largest known sednoid, a class of objects that ...
The ancient Greek astronomer Hipparchus noted the apsidal precession of the Moon's orbit (as the revolution of the Moon's apogee with a period of approximately 8.85 years); [4] it is corrected for in the Antikythera Mechanism (circa 80 BCE) (with the supposed value of 8.88 years per full cycle, correct to within 0.34% of current measurements). [5]
However, there is still limited data on Uranus as it is so far away from Earth and hard to observe regularly. In 2018, Hubble Space Telescope (HST) captured an image of Uranus that showed a large, bright, polar cap over the north pole. The storm is thought to be long-lived and scientists hypothesize it formed by seasonal changes in atmospheric ...
Portia is an inner satellite of Uranus. It was discovered from the images taken by Voyager 2 on 3 January 1986, and was given the temporary designation S/1986 U 1. [8] The moon is named after Portia, the heroine of William Shakespeare's play The Merchant of Venice. It is also designated Uranus XII. [9]