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Nineteen moons are large enough to be round, several having subsurface oceans and one, Titan, having a considerable atmosphere. The Moon is by size and mass the fifth largest natural satellite of the Solar System, categorizable as one of its planetary-mass moons, making it a satellite planet under the geophysical definitions of the term. [17]
A montage of Jupiter and its four largest moons (distance and sizes not to scale) There are 95 moons of Jupiter with confirmed orbits as of 5 February 2024. [1] [note 1] This number does not include a number of meter-sized moonlets thought to be shed from the inner moons, nor hundreds of possible kilometer-sized outer irregular moons that were only briefly captured by telescopes. [4]
In 2021, Scott S. Sheppard and colleagues used the Subaru Telescope at Mauna Kea, Hawaii and discovered two more irregular moons of Neptune, which were announced in 2024. [12] These two moons are provisionally designated S/2021 N 1 and S/2002 N 5. The latter turned out to be a recovery of the lost moon from 2002. [2] [13] Discovery of outer ...
[37] [2] These discoveries brought Saturn's total number of confirmed moons up to 145, making it the first planet known to have over 100 moons. [37] [38] [39] Yet another moon, S/2006 S 20, was announced on 23 May 2023, bringing Saturn's total count moons to 146. [2]
Among the other dwarf planets, Ceres has no known moons. It is 90 percent certain that Ceres has no moons larger than 1 km in size, assuming that they would have the same albedo as Ceres itself. [6] Eris has one large known moon, Dysnomia. Accurately determining its size is difficult: one indicative estimate of its radius is 350 ± 57.5 km. [7]
The radius of the Uranian Hill sphere is approximately 73 million km. [3] The relative sizes of moons are indicated by the size of their symbols, and the Caliban group of Uranian moons is labeled. Data as of February 2024. Uranus's irregular moons range in size from 120 to 200 km to under 10 km . [43]
March 5, 2024: NASA released images of transits of the moon Deimos, the moon Phobos and the planet Mercury as viewed by the Perseverance rover on the planet Mars. Transits viewed from Mars by the Perseverance rover
As of 2024, the only confirmed examples have been 2006 RH 120 in Earth orbit during 2006 and 2007, [5] 2020 CD 3 in Earth orbit between 2018 and 2020, and 2024 PT 5 in Earth orbit during 2024. [6] [7]