when was umbriel discovered

These bodies are extraordinary in the solar system because they share the axial tilt of 98 degrees possessed by their parent planet. Umbriel [UM-bree-ul] is the thirteenth of Uranus' moons and the third largest. In exchange, Vile demanded a soul, but Attrebus refused to the additional requirement. The Umbriel Crisis was an event that threatened Tamriel during the Fourth Era. They write new content and verify and edit content received from contributors. There may be an asymmetry between the leading and trailing hemispheres; the former appears to be redder than the latter. At first, it consumed as much as ten souls per day. Umbriel is about as wide as the Oregon coast line, being 1170 km (780 miles) in size. [8], Umbriel razed everything in its path. As a result, a future mission to explore Uranus and its moons is highly desirable (and a Uranus Flagship mission is indeed recommended by the U.S. planetary decadal survey). The latter could be made of rock and carbonaceous material including heavy organic compounds known as tholins. Intense tidal heating during sporadic passages through resonances could have induced internal melting in some of the icy moons. In 1855, he built a 120-cm telescope, which he installed on the island of Malta for better observing conditions. During their journey, Radhasa revealed to Attrebus that all his guards knew he was a mediocre warrior, and certainly not a hero. Umbriel /mbril/ is a moon of Uranus discovered on October 24, 1851, by William Lassell. [8] Umbriel's orbit lies completely inside the Uranian magnetosphere. Herschel had discovered Uranus itself six years earlier in March 1781. This moon has a diameter of around 946 miles (1,500 km). Its surface may be covered by a relatively thin layer of dark material (so called umbral material) excavated by an impact or expelled in an explosive volcanic eruption. Umbriel consists mainly of ice with a substantial fraction of rock, and may be differentiated into a rocky core and an icy mantle. [29] The polygons were identified from precise photometry of Voyager 2's images and are distributed more or less uniformly on the surface of Umbriel, trending northeastsouthwest. 02:43 Umbriel Crisis Date 4E 48 Place Black Marsh, Morrowind and Cyrodiil Outcome Empire Victory Clavicus Vile recovers Umbra and the power he lost Umbriel is guided to the Realm of the Hist First Side Combatants Commanders Tamrielic Empire Penitus Oculatus The Synod The College of Whispers Titus Mede I General Takar Commander Prossos Strength National Aeronautics and Space Administration Wiki is a FANDOM Lifestyle Community. Umbriel Umbriel was discovered by W. Lassell in 1851. The tilt of Uranus is peculiar in the solar system, and the fact that the moons are also tilted imply that they formed after Uranus got tilted. Sul tried to use Umbra on Vuhon, but the sword did not seem to work. Like most other moons, including the Earths moon, Umbriel is tidally locked with the planet that it orbits. It was discovered at the same time as Ariel and named after a character in Alexander Pope's 1712 poem The Rape of the Lock. New York, William Lassell, who had been the first to see a moon orbiting Neptune, discovered the next two, Ariel and Umbriel. The figure is also known as the sidereel period. We don't really know. Early in its history, however, it may have been in a 1:3 resonance with Miranda. With the advent of the dwarf planet, Uranus now sits as the second furthest planet from the Sun. Future US, Inc. Full 7th Floor, 130 West 42nd Street, It is about the same size as Ariel and has about the same density. In other words, Umbriel is a synchronous or tidally locked satellite, with one face always pointing toward its parent planet. Updates? The surface of Umbriel is slightly blue in color,[21] while fresh bright impact deposits (in Wunda crater, for instance)[22] are even bluer. [8], Umbriel's accretion probably lasted for several thousand years. Umbriel is named after the "dusky melancholy sprite" in Alexander Pope's The Rape of the Lock, and the name suggests the Latin umbra, meaning shadow. Umbriel, the third nearest of Uranus's five major moons, in an image made by Voyager 2 on Jan. 24, 1986. The heat source for the planets comes from tidal interactions with the planet (like with the regular moons of Jupiter and Saturn) which probably played a key role in the evolution of the Uranian satellite system. The irregular moons are on more elliptical, inclined, or retrograde orbits and are probably captured small objects that were captured by Uranus' gravity field. Colin and Letine Arese, an agent of the Emperor who had worked in Hierem's ministry for ten years and gained his trust, broke in Hierem's chambers. [21] However, the color asymmetry of Umbriel is likely caused by accretion of a reddish material coming from outer parts of the Uranian system, possibly, from irregular satellites, which would occur predominately on the leading hemisphere. On October 24, 1851, English merchant and astronomer William Lassell discovered Ariel and Umbriel, two moons of planet Uranus. The surfaces of Uranus's five mid-sized moons exhibit extreme geologic diversity, demonstrating a complex and varied history. Annag gained the trust of the Umbrielians and worked in the kitchens of Umbriel in order to keep Prince Attrebus informed about anything she could discover about Umbriel. Quite what has caused the disparity in features across Miranda is hotly debated, with one suggestion being Miranda was once smashed apart by a massive collision and then haphazardly reassembled. Template:Infobox planet. The escape of CO2 from the interior may be a result of past geological activity on this moon. Umbriel, the moon, was named after a character in English Poet Alexander Pope's play, The Rape of the Lock, who is a dusky melancholy sprite. Currently there is no explanation for why Umbriel is so dark and uniform in appearance. It is also the eighth most massive moon in the solar system. Other Uranian moons are much brighter. These are with their discoverer and year of discovery according to NASA's official catalog: We asked Ravit Helled, a planetary scientist specializing in planet formation, planet interiors, planetary evolution, and solar system physics a few commonly asked questions about the moons of Uranus. In April 2023, the James Webb Space Telescope (JWST) captured a stunning image of Uranus showing the ice giant in incredible detail. While the planet Uranus is fairly easy to spot from Earth, even its largest moons are tough to observe according to the British Astronomical Association. [22] At the time of the flyby the southern hemisphere of Umbriel (like those of the other moons) was pointed towards the Sun, so the northern (dark) hemisphere could not be studied. [12], *Disclosure: Some of the links above are affiliate links, meaning, at no additional cost to you, Fandom will earn a commission if you click through and make a purchase. Follow him on Twitter @sciencef1rst. [22] In fact, among the Uranian moons only Oberon has more impact craters than Umbriel. He went mad as soon as he touched the blade, so his father had to lock him up in the depths of their castle. [1][2] Although William Herschel, the discoverer of Titania and Oberon, claimed at the end of the 18th century that he had observed four additional moons of Uranus,[3] his observations were not confirmed and those four objects are now thought to be spurious. [19] Umbriel has a very low Bond albedo of only about 10% as compared to 23% for Ariel. [edit | edit source] Umbriel was discovered on October 24, 1851 by William Lassell. It was discovered at the same time as Ariel and named after a character in Alexander Pope 's 1712 poem The Rape of the Lock. Umbriel, along with another Uranian satellite, Ariel, was discovered by William Lassell on October 24, 1851. Ravit Helled is a Professor at the Institute for Computational Science, Center for Theoretical Astrophysics and Cosmology, University of Zurich, who specializes in planet formation, planet interiors, planetary evolution, and solar system physics. Space is part of Future US Inc, an international media group and leading digital publisher. So far the only close-up images of Umbriel have been from the Voyager 2 probe, which photographed the moon during its flyby of Uranus in January 1986. . [24] The surface of Umbriel has far more and larger craters than do Ariel and Titania. The cooling near-surface layer contracted, while the interior expanded. Sul deduced that the Dunmer who had taken Umbra must be in Solstheim. All of the regular moons show impact craters and tectonic features such as canyons and cliffs. [18] The melting may have led to the separation of ice from rocks and formation of a rocky core surrounded by an icy mantle. Umbriel consists mainly of ice with a substantial fraction of rock, and may be differentiated into a rocky core and an icy . Colin recovered from the stab and stopped Arese from performing the ritual. As well as being a similar size to its celestial "wife" Titania, Oberon has a similar half-ice/half-rock composition. [5] Sul rescued Attrebus from Radhasa. Tag: umbriel. The space age exploded onto the world in. Umbriel is a moon of Uranus discovered on October 24, 1851, by William Lassell.It was discovered at the same time as Ariel and named after a character in Alexander Pope 's poem The Rape of the Lock.Umbriel consists mainly of ice with a substantial fraction of rock, and may be differentiated into a rocky core and an icy mantle.The surface is the darkest among Uranian . When the British Queen Victoria visited Liverpool in 1851, Lassell was the only personality she specifically asked to meet. He encountered Ilzheven's ghost, who warned him that a Dunmer who wore a signet ring with a draugr had already taken the sword. Umbriel. He opened a door to Malacath's realm, and Attrebus and him escaped from the flying city.[7]. The satellite was discovered by William Lassell on October 24, 1851. Umbriel and Ariel are the third and fourth largest moons of the Uranian system with diameters of 726 miles (1,168 km) and 718 miles (1,156 km) respectively. When you purchase through links on our site, we may earn an affiliate commission. Place Umbriel's heavily cratered surface has probably been stable since the Late Heavy Bombardment. An image of Uranus and several moons of the ice giant, captured by the James Webb Space Telescope. The energetic particles tend to sputter water ice, decompose methane trapped in ice as clathrate hydrate and darken other organics, leaving a dark, carbon-rich residue behind. Gerard Gilligan,William Lassell Telescopes, Planets, and Drinking Beer, [14], Your email address will not be published. Undead armyHierem's agents Magnetosphere: What Planets Have Magnetic Fields and How Do They Differ? The Imperial soldiers made a massive push toward the northwest side of the city. They discovered that the man who recovered Umbra was Elhul Sathil. This is important, because the trailing hemispheres of airless satellites orbiting inside a magnetosphere (like Umbriel) are struck by magnetospheric plasma, which co-rotates with the planet. Certainly. Umbriel also serves as a sink of the magnetospheric charged particles, which creates a pronounced dip in energetic particle count near the moon's orbit as observed by Voyager 2 in 1986. With the advent of the dwarf planet, Uranus now sits as the second furthest planet from the Sun. View of Uranus and six of its moons captured by the James Webb Space Telescope. Attrebus and Sul were healed by Malacath. Breaking space news, the latest updates on rocket launches, skywatching events and more! Umbriel, along with its fellow moon Ariel, was discovered by English astronomer William Lassell on October 24th, 1851. Umbra briefly possessed Vuhon's body before being trapped in the sword. This would have increased Miranda's orbital eccentricity, contributing to the internal heating and geological activity of that moon, while Umbriel's orbit would have been less affected. She had discovered that Hierem intended to become a god draining the power of the tower and using the power of the souls in Umbriel. The value is the radius in km of the said object at the Equator. They were captured by Hirem's agents. You can celebrate with this free webcast, Jam packed issues filled with the latest cutting-edge research, technology and theories delivered in an entertaining and visually stunning way, aiming to educate and inspire readers of all ages, Engaging articles, breathtaking images and expert knowledge, FerdinandCerro Tololo Inter-American Observatory (2001), FranciscoCerro Tololo Inter-American Observatory (2001), TrinculoCerro Tololo Inter-American Observatory (2001). It took several images of Umbriel, which allowed mapping of about 40% of the moons surface. These coronae are lightly cratered collections of ridges and valleys that are walled off from older and more heavily crated regions of Miranda, for the daughter of Prospero in the Shakespeare play, "The Tempest," by sharp boundaries. He became interested in astronomy and, in 1844, began construction of a 24-inch reflecting telescope, using a machine of his own design for polishing the mirror. In particular, Cordelia, which is the closest moon to the ice giant's surface, and Ophelia are known as "shepherd moons." In their march to Umbriel, they were ambushed by a criminal organization hired by Hierem to kill the prince. When Hierem came back to his chambers, Attrebus and Sul were teleported to Umbriel. Sul managed to get away from Umbra, he wandered through the different realms of Oblivion trying to return to Tamriel. [22] A layer of liquid water (ocean) rich in dissolved ammonia may have formed at the coremantle boundary. One of Uranus' most interesting features is its ring system and the ice giant's moons play an important role in shaping these rings. The only thing Vuhon/Umbra, henceforth called Lord Umbriel, needed to break free from Vile was to go to Tamriel in their bubble and use the power of the White-Gold Tower to free them. https://en.wikibooks.org/w/index.php?title=Wikijunior:Solar_System/Uranus/Umbriel&oldid=3174522. Lassell built himself an observatory in West Derby, a suburb of Liverpool with a 610 mm reflector telescope for which he pioneered the use of an equatorial mount for easy tracking of objects as the Earth rotates. Umbriel / mbril / is a moon of Uranus discovered on October 24, 1851, by William Lassell. More National Aeronautics and Space Administration Wiki, National Aeronautics and Space Administration Wiki, http://solarsystem.nasa.gov/planets/profile.cfm?Object=Ura_Umbriel, Do Not Sell or Share My Personal Information. They are not, however, officially recognized due to the poor imaging resolution and generally bland appearance of this moon, which hinders geological mapping. [8][26] Study of limb profiles of Umbriel revealed a possible very large impact feature having the diameter of about 400km and depth of approximately 5km. Elder Scrolls is a FANDOM Games Community. The next Uranus moon was not discovered until almost a century later when Dutch astronomer Gerard Kuiper found the fifth moon, Miranda, in 1948. Around 1854 the observatory was moved to Bradstone. While every effort has been made to follow citation style rules, there may be some discrepancies. The Voyager 2 flyby coincided with the southern hemisphere's 1986 summer solstice, when nearly the entire northern hemisphere was unilluminated. The surface of Umbriel seems to be like many icy moons. Some polygons correspond to depressions of a few kilometers deep and may have been created during an early episode of tectonic activity. Lord Umbriel and his undead armyHierem and his agents The surface of Umbriel is slightly blue in color, while fresh bright impact deposits (in Wunda crater, for instance) are even bluer. From 1870 to 1872 he was the president of the Royal Astronomical Society. Related: The 10 weirdest moons in the solar system. It was discovered at the same time as Ariel and named after a character in Alexander Pope's poem The Rape of the Lock. However, Radhasa, the leader of the ambush decided to keep Attrebus alive and sell him to a eccentric Khajiit in Elsweyr. Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree. Your email address will not be published. Once every 42 years, when Uranus has an equinox and its equatorial plane intersects the Earth, mutual occultations of Uranus's moons become possible. The 5 major and regular moons are in Uranus' equatorial plane and are the only moons of Uranus that are large enough to be spherical. Titania is considered to be composed of a slushy ice mantle over a solid rocky core, with its mass equally divided between ice and rock. Umbriel's orbit has a small eccentricity and is inclined very little relative to the equator of Uranus. Because the regular moons are also tilted it means that they have extreme seasonal cycles, just like Uranus. Umbriel is thought to have formed from an accretion disc or subnebula; a disc of gas and dust that either existed around Uranus for some time after its formation or was created by the giant impact that most likely gave Uranus its large obliquity. In 1849 he was elected an Honorary Fellow of the Royal Society of Edinburgh. Comets or Asteroids or What? Once the citizens evacuated the city, Captain Arges ordered to split into two groups, one north and one south of the Blue Road, and hope the main army of zombies didnt come after both of them. On October 24, 1851 another English astronomer named William Lassell discovered two more moons around Uranus, which would become Ariel and Umbriel. [14] Due to Uranus's lower oblateness and smaller size relative to its satellites, its moons can escape more easily from a mean motion resonance than those of Jupiter or Saturn. Four of the Uranian moons, Titania, Oberon, Umbriel, and Ariel, can be seen with medium to large telescopes and some care. The cause of this asymmetry is not known, but it may be related to the bombardment by charged particles from the magnetosphere of Uranus, which is stronger on the trailing hemisphere (due to the plasma's co-rotation). [22], Umbriel's heavily cratered surface has probably been stable since the Late Heavy Bombardment. NASA suggests they are probably asteroids captured by the massive gravitational influence of the solar system's third-largest planet. This is no mean feat as these bodies are extremely dark, "blacker than asphalt" according to NASA, are located 1.8 billion miles (2.9 billion km) away from the sun, and also have diameters as small as 8 to 10 miles (12 to 16 km). This caused strong extensional stresses in the moon's crust, which may have led to cracking. On top of that, images of Umbriel showed a mysterious bright ring about 140 kilometers in diameter at one of its poles. Its orbital period is around 4.1 Earth-days, coincident with its rotational period. [28] They are not, however, officially recognized due to the poor imaging resolution and generally bland appearance of this moon, which hinders geological mapping. The moon is also designated UranusII. It was discovered at the same time as Ariel and named after a character in Alexander Pope's poem The Rape of the Lock. RobertLeais a science journalist in the U.K. whose articles have been published in Physics World, New Scientist, Astronomy Magazine, All About Space, Newsweek and ZME Science. You can see a huge sunspot 7 times wider than Earth right now but be careful! NY 10036. The next Uranus moon was not discovered until almost a century. [21], Scientists have so far recognized only one class of geological feature on Umbrielcraters. Please refer to the appropriate style manual or other sources if you have any questions. Besides, he also discovered the Neptune moon Triton and the Saturn moon Hyperion. After Miranda escaped from this resonance (through a mechanism that probably resulted in its anomalously high orbital inclination), its eccentricity would have been damped, turning off the heat source. In 1848, he independently co-discovered Hyperion, a moon of Saturn. The 4 main moons of Uranus have radii between 500 and 800 km. We think that the regular moons consist of mostly rock and ices, about 50%-50%, with the innermost satellite Miranda being the most icy one. The next two moons of Uranus to be discovered, Ariel and Umbriel, were spotted by English astronomer William Lassell in 1851. Hierem was finalizing the plan to attack the Imperial City with Vuhon in Umbriel. Later, Herschel thought he had discovered up to six moons (see below) and perhaps even a ring. [20] The reflectivity of the moon's surface decreases from 26% at a phase angle of 0 (geometric albedo) to 19% at an angle of about 1. The most accepted theory for the formation of these moons that are titled together with Uranus (which is titled by around 98 degrees), is that they formed as a result of a giant impact that tilted Uranus, and formed a disk around the young planet from which the regular moons formed. Tamrielic EmpirePenitus OculatusThe SynodThe College of Whispers In January 1986 the Voyager 2 probe was sent into the far reaches of the solar system and made a pass by Uranus. When he received the message he informed his father about Umbriel. The An-Xileel allowed him to perfom the ritual as long as Umbriel only killed non-Argonians and Lukiul (the assimilated). Both Ariel and the slightly larger Uranian satellite Umbriel were discovered by William Lassell on 24 October 1851. The latter two moons are a more challenging observational target due to their proximity to the bright glow of Uranus. Lord Umbriel / VuhonHierem Discovery and name Discovered on 24 October 1851 by William Lassell, it is named for a sky spirit in Alexander Pope 's 1712 poem The Rape of the Lock and Shakespeare 's The Tempest . Its surface may be covered by a relatively thin layer of dark material (so called umbral material) excavated by an impact or expelled in an explosive volcanic eruption.Template:Efn[23] Alternatively, Umbriel's crust may be entirely composed of the dark material, which prevented formation of bright features like crater rays. They drank levitation potions that brought them to Umbriel. The first moons of Uranus to be discovered, Oberon and Titania, were found by German-born astronomer William Herschel in 1787. After the end of formation, the subsurface layer cooled, while the interior of Umbriel heated due to decay of radioactive elements present in its rocks. Umbriel is a moon of Uranus discovered on October 24, 1851, by William Lassell. Since the closest distance between Voyager 2 and Umbriel was 325,000 km (Template:Convert/round mi),[33] the best images of this moon have a spatial resolution of about 5.2km. However, the presence of canyons suggests early endogenic processes, and the moon may have undergone an early endogenically driven resurfacing event that obliterated its older surface. . The moon's density is 1.39g/cm3, which indicates that it mainly consists of water ice, with a dense non-ice component constituting around 40% of its mass. Umbriel, named for a malevolent spirit in Alexander Pope's 18th-century poem "Rape of the Lock," is the darkest of Uranus' largest moons. Once they owned the sword, they were summoned by Clavicus Vile to his realm. But the data are not that great, so there is a large uncertainty in this estimate. Umbriel was named after a spirit in Alexander Popes The Rape of Lock. Annag was decided to save Tamriel from the incoming threat, so she sent a message to Prince Attrebus warning him about Umbriel. Umbriel /mbril/ is a moon of Uranus discovered on October 24, 1851, by William Lassell. These images show that Umbriel has a dark surface, the darkest of any of Uranus' moons. William Lassell died at Maidenhead on October 5, 1880, at age 81. The orbital period, i.e. Umbriel has a very low Bond albedo of only about 10% as compared to 23% for Ariel. He selected a Dunmer named Ilzheven to power the Ingenium. He also discovered the moon Ariel at the same time. Hierem made a trip to Lilmoth and performed a ritual in the Hist of the city to summon Umbriel. An alternative explanation for the tilt of Uranus, the third largest planet in the solar system after Jupiter and Saturn, published in 2022, suggests it might be the result of a now-lost moon, that has wandered away from the ice giant. [7] The names of all four satellites of Uranus then known were suggested by John Herschel[6] in 1852 at the request of Lassell. It approached Lilmoth through the sea. In fact, among the Uranian moons only Oberon has more impact craters than Umbriel. Umbriel consists mainly of ice with a substantial fraction of rock, and may be differentiated into a rocky core and an icy mantle. Profile of Umbriel Umbriel was discovered on October 24th, 1851 by English Astronomer William Lassell who discovered Umbriel at the same time as he discovered another moon named Ariel. The surface of Umbriel has far more and larger craters than do Ariel and Titania. [22] The images cover about 40% of the surface, but only 20% was photographed with the quality required for geological mapping. Near the equator lies Wunda, a large ring of bright material. There may be an asymmetry between the leading and trailing hemispheres; the former appears to be redder than the latter. Near Umbriel's equator lies the most prominent surface feature: Wunda crater, which has a diameter of about 131km. Titania is the largest moon of Uranus, with a diameter of around 1,000 miles (1,609 km), which still makes it under half as wide as Earth's moon which has a diameter of around 2,200 miles (3,500 km). The Ingenium needed souls to be powered. This hypothesis would explain the asymmetry in its distribution, as the trailing hemisphere is subject to a more intense magnetospheric influence than the leading hemisphere. Once every 42 years, when Uranus has an equinox and its equatorial plane intersects the Earth, mutual occultations of Uranus's moons become possible. the period it takes to complete an orbit round Uranus is 4.14418 days. Black Marsh and Cyrodiil were the most affected provinces, although Morrowind was also involved in the conflict. the mid 20th century, and we finally were able to get a better look at the moons of Uranus. He launched an attack on Umbriel, half of the legion suddenly left the ground, along with the engines, and flew toward the city. [27], Much like other moons of Uranus, the surface of Umbriel is cut by a system of canyons trending northeastsouthwest. Date It was discovered on October 24th 1851 by William Lassell. Combatants All these large Uranian moons are tidally locked to their parent ice giant meaning, as is the case with Earth's moon, one face of these moons constantly points at the planet. The fallen men and women were resurrected as zombies, thickening Umbriel's army of undead. Fast Summary Facts About The Moon Umbriel! [8], The initial accretional heating together with continued decay of radioactive elements may have led to melting of the ice[31] if an antifreeze like ammonia (in the form of ammonia hydrate) or some salt was present. The outer solar system is ruled by the ice giants Uranus and its twin planet Neptune. It appears to have many craters, but is not as heavily cratered as Callisto. Voyager found an old surface with unusually large craters, and determined Umbriel 's composition to be about half ice and half rock. It was also where Umbriel would arrive, if it continued on the course it was presently following. The surface is the darkest among Uranian moons, and appears to have been shaped primarily by impacts. Uranus' largest moons and its "Frankenstein's Monster". This is something it has in common with all of the inner Uranian moons. [9] The origin of the carbon dioxide is not completely clear. [4], Sul, who after serving Azura had managed to return to Tamriel, received a vision from the Daedric Prince. The Moon Mars' Moons - 2 Mars has two moons called Phobos and Deimos. Heres how it works. Letine had suffered for ten years, and she wanted to something in exchange, to feel safe again. Umbriel. [2], Umbriel orbits Uranus at the distance of about 266,000 km (Template:Convert/round mi), being the third farthest from the planet among its five major moons.Template:Efn Umbriel's orbit has a small eccentricity and is inclined very little relative to the equator of Uranus. The innermost of the large Uranian moons is Miranda with a diameter of around 292 miles (470 km) which NASA describes as appearing as if it is composed of parts from different bodies, almost like a celestial Frankenstein's monster. Umbriel consists mainly of ice with a substantial fraction of rock, and may be differentiated into a rocky core and an icy mantle. The moons of Uranus also have unique names in the solar system, Whereas the normal naming convention is for celestial objects to share monikers with mythical figures, instead, most of Uranus' moons are named are characters created by William Shakespeare, with only a couple taking their names from the works of Alexander Pope. They made a bargain with the prince to allow them to defeat Umbra and return him the power he had stolen from him. The irregular moons have retrograde orbits, while the others are prograde (i.e., they orbit in the same direction as Uranus). The moons that formed in such a subnebula would contain less water ice (with CO and N2 trapped as clathrate) and more rock, explaining the higher density. Azura warned him about Umbriel and hinted him to find Attrebus, so that he could avenge Ilzeheven. In total, Uranus has 27 known natural satellites and along with Ariel and Umbriel, Miranda, Titania, and Oberon belong to the five main satellites.

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