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Ilmarë
Ilmarë,Stressed on the first syllable or Varda I, full designation , is the single known natural satellite of the Kuiper Belt planetoid 174567 Varda. It was discovered by Keith Noll et al. in 2009, at a separation of about 0.12 arcsec, using discovery images taken by the Hubble Space Telescope on 26 April 2009, and reported in 2011. At approximately 326 km in diameter (about 45% that of its primary), it is the fourth or fifth-largest known moon of a trans-Neptunian object, after Pluto I Charon, Eris I Dysnomia, Orcus I Vanth and very possibly Haumea I Hiʻiaka. Assuming that Ilmarë has the same albedo and density as Varda, Ilmarë would constitute approximately 8.4% of the system's mass, approximately . Name Names for Varda and its moon were announced on 2014 January 16. Ilmarë () is a chief of the Maiar and handmaiden to Varda, the queen of the Valar, creator of the stars, and principal goddess of the elves in J. R. R. Tolkien John Ronald Reuel Tolkien ( ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
174567 Varda
174567 Varda (provisional designation ) is a binary trans-Neptunian planetoid of the resonant hot classical population of the Kuiper belt, located in the outermost region of the Solar System. Its moon, Ilmarë, was discovered in 2009. Michael Brown estimates that, with an absolute magnitude of 3.5 and a calculated diameter of approximately , it is likely a dwarf planet. However, William M. Grundy ''et al.'' argue that objects in the size range of 400–1000 km, with albedos less than ≈0.2 and densities of ≈1.2 g/cm3 or less, have likely never compressed into fully solid bodies, let alone differentiated, and so are highly unlikely to be dwarf planets.W.M. Grundy, K.S. Noll, M.W. Buie, S.D. Benecchi, D. Ragozzine & H.G. Roe, 'The Mutual Orbit, Mass, and Density of Transneptunian Binary Gǃkúnǁʼhòmdímà ()', ''Icarus'(forthcoming, available online 30 March 2019) DOI: 10.1016/j.icarus.2018.12.037, It is not clear if Varda has a low or a high density. Discovery an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Natural Satellite
A natural satellite is, in the most common usage, an astronomical body that orbits a planet, dwarf planet, or small Solar System body (or sometimes another natural satellite). Natural satellites are often colloquially referred to as ''moons'', a derivation from the Moon of Earth. In the Solar System, there are six planetary satellite systems containing 209 known natural satellites altogether. Seven objects commonly considered dwarf planets by astronomers are also known to have natural satellites: , Pluto, Haumea, , Makemake, , and Eris. , there are 442 other minor planets known to have natural satellites. A planet usually has at least around 10,000 times the mass of any natural satellites that orbit it, with a correspondingly much larger diameter. The Earth–Moon system is a unique exception in the Solar System; at 3,474 kilometres (2,158 miles) across, the Moon is 0.273 times the diameter of Earth and about of its mass. The next largest ratios are the Neptune–Tr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Orcus I Vanth
Vanth, full designation , is the single known natural satellite of the plutino and likely dwarf planet 90482 Orcus. With a diameter of about 440 km, it is half the size of Orcus and probably the third-largest known moon of a known trans-Neptunian object, after Pluto I Charon and Eris I Dysnomia, though it is possible that the poorly resolved Varda I Ilmarë or Haumea I Hiiaka might be comparable in size. Vanth was discovered by Michael Brown and T.-A. Suer using discovery images taken by the Hubble Space Telescope on 13 November 2005. The discovery was announced in an IAU Circular notice published on 22 February 2007. Using observations with the Hubble Space Telescope from 13 November 2005, Michael Brown and T. A. Suer detected a natural satellite. The discovery of a satellite of Orcus was reported in an IAU Circular notice published on 22 February 2007. The satellite was given the designation S/2005 (90482) 1 before later being named ''Vanth''. It orbits Orcus in a nearl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hubble Space Telescope
The Hubble Space Telescope (often referred to as HST or Hubble) is a space telescope that was launched into low Earth orbit in 1990 and remains in operation. It was not the first space telescope, but it is one of the largest and most versatile, renowned both as a vital research tool and as a public relations boon for astronomy. The Hubble telescope is named after astronomer Edwin Hubble and is one of NASA's Great Observatories. The Space Telescope Science Institute (STScI) selects Hubble's targets and processes the resulting data, while the Goddard Space Flight Center (GSFC) controls the spacecraft. Hubble features a mirror, and its five main instruments observe in the ultraviolet, visible, and near-infrared regions of the electromagnetic spectrum. Hubble's orbit outside the distortion of Earth's atmosphere allows it to capture extremely high-resolution images with substantially lower background light than ground-based telescopes. It has recorded some of the most detaile ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trans-Neptunian Satellites
A trans-Neptunian object (TNO), also written transneptunian object, is any minor planet in the Solar System that orbits the Sun at a greater average distance than Neptune, which has a semi-major axis of 30.1 astronomical units (au). Typically, TNOs are further divided into the classical and resonant objects of the Kuiper belt, the scattered disc and detached objects with the sednoids being the most distant ones. As of October 2020, the catalog of minor planets contains 678 numbered and more than 2,000 unnumbered TNOs. The first trans-Neptunian object to be discovered was Pluto in 1930. It took until 1992 to discover a second trans-Neptunian object orbiting the Sun directly, 15760 Albion. The most massive TNO known is Eris, followed by Pluto, , , and . More than 80 satellites have been discovered in orbit of trans-Neptunian objects. TNOs vary in color and are either grey-blue (BB) or very red (RR). They are thought to be composed of mixtures of rock, amorphous carbon a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tolkien's Legendarium
Tolkien's legendarium is the body of J. R. R. Tolkien's mythopoeic writing, unpublished in his lifetime, that forms the background to his ''The Lord of the Rings'', and which his son Christopher summarized in his compilation of ''The Silmarillion'' and documented in his 12-volume series ''The History of Middle-earth''. The legendarium's origins reach back to 1914, when Tolkien began writing poems and story sketches, drawing maps, and inventing languages and names as a private project to create a unique English mythology. The earliest story drafts (of ''The Book of Lost Tales'') are from 1916; he revised and rewrote these for most of his adult life. ''The Hobbit'' (1937), Tolkien's first published novel, was not originally part of the larger mythology but became linked to it. Both ''The Hobbit'' and ''The Lord of the Rings'' (1954 and 1955) took place in the Third Age of Middle-earth, while virtually all of his earlier writing had been set in the first two ages of the world. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Varda (Middle-earth)
The Valar (; singular Vala) are characters in J. R. R. Tolkien's legendarium. They are "angelic powers" or "gods", #154 to Naomi Mitchison, September 1954 subordinate to the one God (Eru Ilúvatar). The Ainulindalë describes how those of the Ainur who chose to enter the World (Arda) to complete its material development after its form was determined by the Music of the Ainur are called the Valar, or "the Powers of the World". The Valaquenta indicates that the Elves generally reserved the term "Valar" for the mightiest of these, calling the others the Maiar. The Valar are mentioned briefly in ''The Lord of the Rings'' but were developed earlier in material published posthumously in ''The Silmarillion'', ''The History of Middle-earth'', and ''Unfinished Tales''. Scholars have noted that the Valar resemble angels in Christianity but that Tolkien presented them rather more like pagan gods. Their role in providing what the characters on Middle-earth experience as luck or providenc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eris I Dysnomia
Dysnomia (formally (136199) Eris I Dysnomia) is the only known moon of the dwarf planet Eris and is likely the second-largest known moon of a dwarf planet, after Pluto I Charon. It was discovered in September 2005 by Mike Brown and the Laser Guide Star Adaptive Optics (LGSAO) team at the W. M. Keck Observatory. It carried the provisional designation of until it was officially named ''Dysnomia'' (from the Ancient Greek word meaning anarchy/lawlessness) in September 2006, after the daughter of the Greek goddess Eris. Dysnomia has an estimated diameter of (25% to 35% of Eris's diameter), and is among the dozen or so largest objects in the trans-Neptunian region. Discovery During 2005, the adaptive optics team at the Keck telescopes in Hawaii carried out observations of the four brightest Kuiper belt objects (Pluto, , , and ), using the newly commissioned laser guide star adaptive optics system. Observations taken on September 10, 2005, revealed a moon in orbit around Eris, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Haumea I Hiʻiaka
, discoverer = , discovered = , earliest_precovery_date = March 22, 1955 , mpc_name = (136108) Haumea , pronounced = , adjectives = Haumean , note = yes , alt_names = , named_after = Haumea , mp_category = , orbit_ref = , epoch = 17 December 2020 ( JD 2459200.5) , uncertainty = 2 , observation_arc = () , aphelion = , perihelion = , time_periastron = ≈ 1 June 2133±2 days , semimajor = , eccentricity = 0.19642 , period = 283.12 yr (103,410 days) , mean_anomaly = 218.205 ° , mean_motion = / day , inclination = 28.2137° , asc_node = 122.167° , arg_peri = 239.041° , avg_speed = , satellites = 2 (Hiʻiaka and Namaka) and ring , dimensions = , mean_radius = , surface_area = ≈ , volume = ≈ , mass = , density = , surface_grav = ≈ m/s2 , escape_velocity = ≈ km/s , sidereal_day = () , right_asc_north_pole = , declination = or , spectral_type = , magnitude = 17.3 (opposition) , abs_magnitude = ( V-ba ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Keith S
Keith may refer to: People and fictional characters * Keith (given name), includes a list of people and fictional characters * Keith (surname) * Keith (singer), American singer James Keefer (born 1949) * Baron Keith, a line of Scottish barons in the late 18th century * Clan Keith, a Scottish clan associated with lands in northeastern and northwestern Scotland Places Australia * Keith, South Australia, a town and locality Scotland * Keith, Moray, a town ** Keith railway station * Keith Marischal, East Lothian United States * Keith, Georgia, an unincorporated community * Keith, Ohio, an unincorporated community * Keith, West Virginia, an unincorporated community * Keith, Wisconsin, a ghost town * Keith County, Nebraska Other uses * Keith F.C., a football team based in Keith, Scotland * , a ship of the British Royal Navy * Hurricane Keith, a 2000 hurricane that caused extensive damage in Central America * ''Keith'' (film), a 2008 independent film directed by Todd Kessler * ' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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