tethys and dione moons of


Beyond these larger moons are Saturn's Irregular Moons. [42], In 2006, four tiny moonlets were found in Cassini images of the A Ring. In 2006, astronomers using Japan's Subaru Telescope at Mauna Kea reported the discovery of nine more irregular moons. This began with the arrival of the Voyager spacecraft to the Cronian system in 1980-81, which resulted in the discovery of three additional moons – Atlas, Prometheus, and Pandora – bringing the total to 17.

Name Edit. It is an icy body similar in nature to Dione and Rhea. [44] The moonlets themselves are tiny, ranging from about 40 to 500 meters in diameter, and are too small to be seen directly. [28][37] They are Aegir, Bergelmir, Bestla, Farbauti, Fenrir, Fornjot, Greip, Hati, Hyrrokkin, Jarnsaxa, Kari, Loge, Mundilfari, Narvi, Phoebe, Skathi, Skoll, Surtur, Suttungr, Thrymr, Ymir,[37] and twenty-five unnamed satellites. The surface of Hyperion is covered with numerous impact craters, most of which are 2 to 10 km in diameter. This group is also sometimes referred to as the Phoebe group, due to the presence of a single larger moon in the group – which measures 240 km in diameter.
The majority of its surface is made up of heavily cratered and hilly terrain and a smaller and smoother plains region. In addition to the larger moons that are believed to have formed from a massive debris field that once orbited it, it also has countless smaller satellites that were captured by its gravitational field over the course of billions of years. Saturn has 82 moons with confirmed orbits that are not embedded in its rings[1] – of which only 13 have diameters greater than 50 kilometers – as well as dense rings that contain millions of embedded moonlets and innumerable smaller ring particles.

[85], Artist's concepts of the Saturnian ring–moon system, Saturn, its rings and major icy moons—from Mimas to Rhea. The orbital parameters were taken from Spitale, et al. The second largest, Ymir, measures 18 km across. When in the 20th century, the names of Titans were exhausted, the moons were named after different characters of the Greco-Roman mythology, or giants from other mythologies. Its frozen mysteries await Cassini's planned close flyby in September 2005. They are trojan moons of Dione (Helene) and Tethys (Telesto and Calypso). The Inuit group includes seven prograde outer moons that are similar enough in their distances from the planet (186–297 radii of Saturn), their orbital inclinations (45–50°) and their colors that they can be considered a group. Twenty-four of Saturn's moons are regular satellites; they have prograde orbits not greatly inclined to Saturn's equatorial plane. In fact, 34 of the moons that have been named are less than 10 km in diameter while another 14 are 10 to 50 km in diameter. Their inclinations are in the 35°-40° range, their eccentricities around 0.53, and they range in size from 6 to 32 km.
However, the mechanics of how the moon's formed remains a mystery for the time being. In 1848, Lassell proposed that the eighth satellite of Saturn be named Hyperion after another Titan. The moons of Saturn are numerous and diverse, ranging from tiny moonlets only tens of meters across to enormous Titan, which is larger than the planet Mercury. In April of 2007, Tarqeq (S/2007 S 1) was announced, and in May of that same year, S/2007 S 2 and S/2007 S 3 were reported. With a diameter and mass of 1,123 km and 11×1020 kg, Dione is the largest inner moon of Saturn. [47] These moons are coated with dusty material that has smoothed out their surfaces.[56].

[27] A survey starting in late 2000 and conducted using three medium-size telescopes found thirteen new moons orbiting Saturn at a great distance, in eccentric orbits, which are highly inclined to both the equator of Saturn and the ecliptic. [43] Before this discovery only two larger moons had been known within gaps in the A Ring: Pan and Daphnis. One huge ice trench, the Ithaca Chasma, is 40 miles (65 km) wide and extends over 3/4 of the way around the moon. [46], In April 2014, NASA scientists reported the possible consolidation of a new moon within the A Ring. Dione has a diameter of 700 miles and is made of ice and rock. Because of this, ground-based telescopes have begun to discovered several new irregular moons around Saturn. These satellites range in size from 6 to 18 km, their distances from 12 and 24 million km, their inclinations between 136° and 175°, and their eccentricities between 0.13 and 0.77. Saturn's largest moon, Titan, was discovered in 1655 by Christiaan Huygens using a 57-millimeter (2.2 in) objective lens[12] on a refracting telescope of his own design. From left to right: Mimas, Enceladus, Tethys, Dione, Rhea; Titan in the background; Iapetus (top right) and irregularly shaped Hyperion (bottom right). It is thought that Saturn's moon of Titan, its mid-sized moons and rings developed in a way that is closer to the Galilean moons of Jupiter. The Gallic group are a group of four prograde outer moons named for characters in Gallic mythology -Albiorix, Bebhionn, Erriapus, and Tarvos. It is an icy body similar in nature to Dione and Rhea. These moons are probably captured minor planets, or debris from the breakup of such bodies after they were captured, creating collisional families. S/2004 S 4 was most likely a transient clump—it has not been recovered since the first sighting. For the entire 20th century, Phoebe stood alone among Saturn's known moons with its highly irregular orbit. It is not yet clear if these are real satellites or merely persistent clumps within the F Ring. [14] Mimas and Enceladus were discovered in 1789 by William Herschel. [19], The Cassini mission,[20] which arrived at Saturn in the summer of 2004, initially discovered three small inner moons including Methone and Pallene between Mimas and Enceladus as well as the second trojan moon of Dione – Polydeuces. Named after the Alkyonides of Greek mythology, they are some of the smallest moons in the Saturn system. [27][28] In 2005, astronomers using the Mauna Kea Observatory announced the discovery of twelve more small outer moons,[29][30] in 2006, astronomers using the Subaru 8.2 m telescope reported the discovery of nine more irregular moons,[31] in April 2007, Tarqeq (S/2007 S 1) was announced and in May of the same year S/2007 S 2 and S/2007 S 3 were reported. For a listing of other moons, see Moons of the Planets. The six other planemo (ellipsoidal) moons constitute roughly 4% of the mass, and the remaining 75 small moons, together with the rings, comprise only 0.04%. CallUrl('www>sozvezdiya>ruphp',0), ~TildeLink() is known to have a density very close to that of water, indicating that it is likely composed mainly of water ice. [21] Helene is by far the largest trojan moon,[48] while Polydeuces is the smallest and has the most chaotic orbit. The Norse (or Phoebe) group consists of 46 retrograde outer moons. The largest among them is Siarnaq with an estimated size of about 40 km. They often occur as collisional families or groups. Pickering. It shares the same orbit with Janus—the only known example of co-orbitals in the Solar System. These jets are one of several indications that Enceladus has liquid water beneath it's icy crust, where geothermal processes release enough heat to maintain a warm water ocean closer to its core. The surface is bombarded with craters, including the big one at the bottom called Melanthius.

2006, To Saturn's equator for the regular satellites, and to the ecliptic for the irregular satellites, Only known prograde outer satellite, inclination similar to other satellites of the Gallic group, Probably a captured asteroid due to its unusually high eccentricity, though orbit is similar to the Norse group. CallUrl('lifeng>lamost>orgHTM',0), By increasing proximity to Saturn, the middle moons are Iapetus, Hyperion, Titan, ~TildeLink(), Dione, Rhea, Enceladus, and Mimas. CallUrl('www>enchantedlearning>comshtml',0), You can see as many as five of Saturn's moons- Titan, Enceladus, Dione, ~TildeLink(), and Rhea with a 6 or 8-inch telescope. [2][3][4] Seven Saturnian moons are large enough to have collapsed into a relaxed, ellipsoidal shape, though only one or two of those, Titan and possibly Rhea, are currently in hydrostatic equilibrium.

In addition, two more asteroids previously shared the names of Saturnian moons until spelling differences were made permanent by the International Astronomical Union (IAU): Calypso and asteroid 53 Kalypso; and Helene and asteroid 101 Helena. [27] They are neutral or moderately red in color—similar to C-type, P-type, or D-type asteroids,[37] though they are much less red than Kuiper belt objects.[27][c]. Over 150 moonlets embedded in the rings have been detected by the disturbance they create in the surrounding ring material, though this is thought to be only a small sample of the total population of such objects. With additional missions mounted to study the atmospheres, compositions and surfaces of these moons, we may begin to understand where they truly came from. At 1,470 km in diameter and 18×1020 kg in mass, Iapetus is the third-largest of Saturn's large moons. or, by Matt Williams, Universe Today. CallUrl('www>kcvs>cahtm',0), Some, like Dione and ~TildeLink(), show evidence of tectonic activity, where forces from within ripped apart their surfaces. However, there are some variations on this theory. [33], The modern names for Saturnian moons were suggested by John Herschel in 1847.

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