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It was believed that the cutoff for round objects is somewhere between 100 km and 200 km in radius if they have a large amount of ice in their makeup; [1] however, later studies revealed that icy satellites as large as Iapetus (1,470 kilometers in diameter) are not in hydrostatic equilibrium at this time, [2] and a 2019 assessment suggests that ...
1.280 Mm – diameter of the trans-Neptunian object 50000 Quaoar; 1.436 Mm – diameter of Iapetus, one of Saturn's major moons; 1.578 Mm – diameter of Titania, the largest of Uranus's moons; 1.960 Mm – estimated longest axis of Haumea; 2.326 Mm – diameter of the dwarf planet Eris, the largest trans-Neptunian object found to date
Saturn's rings require at least a 15-mm-diameter telescope [151] to resolve and thus were not known to exist until Christiaan Huygens saw them in 1655 and published his observations in 1659. Galileo, with his primitive telescope in 1610, [152] [153] incorrectly thought of Saturn's appearing not quite round as two moons on Saturn's sides.
Mimas, also designated Saturn I, is the seventh-largest natural satellite of Saturn.With a mean diameter of 396.4 kilometres or 246.3 miles, Mimas is the smallest astronomical body known to be roughly rounded in shape due to its own gravity.
Solar radius is a unit of distance used to express the size of stars in astronomy relative to the Sun. ... Saturn: 0.0866 60,268 [18] Uranus: 0.03673 25,559 [18 ...
It is estimated that the A Ring contains 7,000–8,000 propellers larger than 0.8 km in size and millions larger than 0.25 km. [4] In April 2014, NASA scientists reported the possible consolidation of a new moon within the A Ring, implying that Saturn's present moons may have formed in a similar process in the past when Saturn's ring system was ...
Saturn – sixth planet from the Sun and the second-largest in the Solar System, after Jupiter. It is a gas giant with an average radius about nine times that of Earth . [ 1 ] [ 2 ] Although only one-eighth the average density of Earth, with its larger volume Saturn is just over 95 times more massive.
Phoebe (/ ˈ f iː b i / FEE-bee) is the most massive irregular satellite of Saturn with a mean diameter of 213 km (132 mi). It was discovered by William Henry Pickering on 18 March 1899 [9] from photographic plates that had been taken by DeLisle Stewart starting on 16 August 1898 at the Boyden Station of the Carmen Alto Observatory near Arequipa, Peru.