|
Salacia I Actaea
Actaea, officially (120347) Salacia I Actaea, is a natural satellite of the classical Kuiper belt object, classical Kuiper belt planetoid 120347 Salacia. Its diameter is estimated , which is approximately one-third the diameter of Salacia; thus, Salacia and Actaea are viewed by William Grundy et al. to be a binary asteroid, binary system. Assuming that the following size estimates are correct, Actaea is about the sixth-biggest known moon of a trans-Neptunian object, after Charon (moon), Charon (1212 km), Dysnomia (moon), Dysnomia (700 km), Vanth (moon), Vanth (443 km), Ilmarë (moon), Ilmarë (326 km) and Hiiaka (moon), Hiiaka (320 km), but possibly also Hiisi (moon), Hiisi (250 km). Discovery and name It was discovered on 21 July 2006 by Keith S. Noll, Harold Levison, Denise Stephens and Will Grundy with the Hubble Space Telescope. On 18 February 2011, it was officially named Actaea after the nereid Aktaia. Orbit Actaea orbits its primary every at a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trans-Neptunian Object
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 and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tide
Tides are the rise and fall of sea levels caused by the combined effects of the gravity, gravitational forces exerted by the Moon (and to a much lesser extent, the Sun) and are also caused by the Earth and Moon orbiting one another. Tide tables can be used for any given locale to find the predicted times and amplitude (or "tidal range"). The predictions are influenced by many factors including the alignment of the Sun and Moon, the #Phase and amplitude, phase and amplitude of the tide (pattern of tides in the deep ocean), the amphidromic systems of the oceans, and the shape of the coastline and near-shore bathymetry (see ''#Timing, Timing''). They are however only predictions, the actual time and height of the tide is affected by wind and atmospheric pressure. Many shorelines experience semi-diurnal tides—two nearly equal high and low tides each day. Other locations have a diurnal cycle, diurnal tide—one high and low tide each day. A "mixed tide"—two uneven magnitude ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Salacia Actaea Orbit Simulation
In ancient Roman mythology, Salacia ( , ) was the female divinity of the sea, worshipped as the goddess of salt water who presided over the depths of the ocean. Neptune was her consort. That Salacia was the consort of Neptune is implied by Varro, and is positively affirmed by Seneca, Augustine and Servius. She is identified with the Greek goddess Amphitrite, consort of Poseidon. The god Neptune wanted to marry Salacia, but she was in great awe of her distinguished suitor, and to preserve her virginity, with grace and celerity she managed to glide out of his sight, and hid from him in the Atlantic Ocean. The grieving Neptune sent a dolphin to look for her and persuade the fair nymph to return and share his throne. Salacia agreed to marry Neptune and the King of the Deep was so overjoyed at these good tidings that the dolphin was awarded a place in the heavens, where he now forms a well known constellation Delphinus. Salacia is represented as a beautiful nymph, crowned w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nereid
In Greek mythology, the Nereids or Nereides ( ; grc, Νηρηΐδες, Nērēḯdes; , also Νημερτές) are sea nymphs (female spirits of sea waters), the 50 daughters of the 'Old Man of the Sea' Nereus and the Oceanids, Oceanid Doris (mythology), Doris, sisters to their brother Nerites (mythology), Nerites. They often accompany Poseidon, the god of the sea, and can be friendly and helpful to sailors (such as the Argonauts in their search for the Golden Fleece). Etymology The synonyms Νηρηΐδες and Νημερτές are etymologically unrelated. Νηρηΐδες is a patronymic, describing them as the daughters of Nereus. Νημερτές means literally 'not-mistaking', and there is an adjective of the same form meaning 'clear', 'unmistakable', or 'true'. Mythology The Nereids symbolized everything that is beautiful and kind about the sea. Their melodious voices sang as they danced around their father. They are represented as beautiful women, crowned with branc ... [...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] |
Harold Levison
Harold F. (Hal) Levison (born 1959) is an American planetary scientist specializing in planetary dynamics. He currently works at the Southwest Research Institute, Boulder, CO, Boulder, Colorado, and studies planetary orbits and their evolution through Solar System history. Levison is the Principal Investigator of the Lucy (spacecraft), ''Lucy'' mission to tour multiple Jupiter trojans, which was selected as the thirteenth mission in NASA's Discovery Program in January 2017. Among other achievements, Levison is the co-author of SWIFT (scientific software), SWIFT, a commonly used Symplectic geometry, symplectic integrator that solves planetary equations of motion for periods of billions of years. Levison argued for a distinction between what are now called dwarf planets and the other eight planets based on their inability to "Clearing the neighbourhood, clear the neighborhood around their orbits", although his proposal suggested the terms "unterplanet" and "überplanet" and used ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hiisi (moon)
47171 Lempo, or as a binary (47171) Lempo–Hiisi (also known as ), is a trans-Neptunian object and trinary system from the Kuiper belt, located in the outermost regions of the Solar System. It was discovered on 1 October 1999, by American astronomers Eric Rubenstein and Louis-Gregory Strolger during an observing run at Kitt Peak National Observatory in Arizona, United States. Rubenstein was searching images taken by Strolger as part of their Nearby Galaxies Supernova Search project. It is classified as a plutino with a 2:3 mean-motion resonance with Neptune and is among the brighter TNOs. It reached perihelion in July 2015. This minor planet was named after Lempo from Finnish mythology. The trinary system's other two components, Paha and Hiisi , were discovered in 2001 and 2007, respectively, and later named after Lempo's two demon cohorts, Paha and Hiisi. History Discovery The Lempo system was discovered on 1 October 1999 by American astronomers Eric Rubenst ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ilmarë (moon)
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 , 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 .... 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 ... [...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] |
Vanth (moon)
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 near ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dysnomia (moon)
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] |
.jpg "Click for more on -> Dysnomia (moon)")