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Pallene (moon)
Pallene is a very small natural satellite of Saturn. It is one of three small moons known as the Alkyonides that lie between the orbits of the larger Mimas and Enceladus. It is also designated . Discovery Pallene was discovered by the Cassini Imaging Team in 2004, during the Cassini–Huygens mission. It was given the temporary designation . In 2005, the name Pallene was provisionally approved by the IAU Division III Working Group for Planetary System Nomenclature, and was ratified at the IAU General Assembly in 2006. The name refers to Pallene, one of the Alkyonides, the seven beautiful daughters of the giant Alkyoneus. After the discovery in 2004, it was realized that Pallene had been first photographed on August 23, 1981, by the space probe '. It had appeared in a single photograph and had been provisionally named and estimated to orbit 200,000 km from Saturn. Because it had not been visible in other images, it had not been possible to compute its orbit at the ti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pallene (mythology)
In Greek mythology, the name Pallene ( ; Ancient Greek: Παλλήνη) may refer to two Thracian characters: * Pallene, one of the Alcyonides, daughters of the giant Alcyoneus. She was the sister of Alkippe, Anthe, Asteria, Drimo, Methone and Phthonia ( Phosthonia or Chthonia). When their father was slain by Heracles, these girls threw themselves into the sea from Kanastraion, which is the peak of Pellene. They were then transformed into halcyons (kingfishers) by the goddess Amphitrite. * Pallene, a Thracian princess as the daughter of King Sithon and the nymph Mendeis or the naiad Achiroe,Tzetzes on Lycophron, 1161 and the sister of Rhoeteia. She was wooed by Dryas and Clitus, and eventually married the latter, and had a daughter Chrysonoe (Torone), the wife of Proteus. Alternately, Pallene consorted with Dionysus.Nonnus, ''Dionysiaca'' 48 Notes References * Conon'', Fifty Narrations, surviving as one-paragraph summaries in the Bibliotheca (Library) of Photius, Pa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alkyonides
The Alcyonides (, ''Alkyonides'') were, in Greek mythology, the seven daughters of the giant Alcyoneus. Names These sisters were identified individually as, Alkippe, Anthe, Asteria, Drimo, Methone, Pallene and Phthonia ( Phosthonia or Chthonia). Mythology When their father Alcyoneus was slain by Heracles, the Alcyonides threw themselves into the sea from Kanastraion, which is the peak of Pellene. They were transformed into halcyons (kingfishers) by Amphitrite. Legacy Islands The Alkyonides are also small rocky islands in the Corinthian Gulf very close to the coast of Attica, Peloponnese and Central Greece, taking their name from the mythological figures. They reported a 2001 census population of nine inhabitants and are administratively part of the municipality of Loutraki-Perachora in Corinthia. Climate The term ''Alkyonides'' also refers to a meteorological phenomenon of the central Greek climate. Nearly every year in the period after Christmas until the middl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pallene N1694657087 Cleaned , a city and polis of ancient Achaea
{{disambig, geo ...
Pallene can refer to: * Pallene (mythology), one of the seven Alkyonides, daughters of the giant Alkyoneus in Greek mythology * Pallene (moon), a small moon of Saturn, discovered in 2004 * Pallene (Attica), a deme of ancient Attica, Greece *Pallini, a town east of Athens, Greece *Pallene, Chalcidice, the westernmost headland of the Chalcidice, Greece, also called Kassandra ** Pallini, Chalcidice, a municipality in the above See also * Pellene Pellene (; grc, Πελλήνη; grc-x-doric, Πελλάνα or Πελλίνα) was a city and polis (city-state) of ancient Achaea, the most easterly of the twelve Achaean cities (the Achaean League). Its territory bordered upon that of Sicyon o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rings Of Saturn
The rings of Saturn are the most extensive ring system of any planet in the Solar System. They consist of countless small particles, ranging in size from micrometers to meters, that orbit around Saturn. The ring particles are made almost entirely of water ice, with a trace component of rocky material. There is still no consensus as to their mechanism of formation. Although theoretical models indicated that the rings were likely to have formed early in the Solar System's history, newer data from '' Cassini'' suggested they formed relatively late. Although reflection from the rings increases Saturn's brightness, they are not visible from Earth with unaided vision. In 1610, the year after Galileo Galilei turned a telescope to the sky, he became the first person to observe Saturn's rings, though he could not see them well enough to discern their true nature. In 1655, Christiaan Huygens was the first person to describe them as a disk surrounding Saturn. The concept that Saturn's rin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saturn Outer Rings Labeled
Saturn is the sixth planet from the Sun and the second-largest in the Solar System, after Jupiter. It is a gas giant with an average radius of about nine and a half times that of Earth. It has only one-eighth the average density of Earth; however, with its larger volume, Saturn is over 95 times more massive. Saturn's interior is most likely composed of a core of iron–nickel and rock (silicon and oxygen compounds). Its core is surrounded by a deep layer of metallic hydrogen, an intermediate layer of liquid hydrogen and liquid helium, and finally, a gaseous outer layer. Saturn has a pale yellow hue due to ammonia crystals in its upper atmosphere. An electrical current within the metallic hydrogen layer is thought to give rise to Saturn's planetary magnetic field, which is weaker than Earth's, but which has a magnetic moment 580 times that of Earth due to Saturn's larger size. Saturn's magnetic field strength is around one-twentieth of Jupiter's. The outer atmosphere is gen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Osculating Orbit
In astronomy, and in particular in astrodynamics, the osculating orbit of an object in space at a given moment in time is the gravitational Kepler orbit (i.e. an elliptic or other conic one) that it would have around its central body if perturbations were absent. That is, it is the orbit that coincides with the current orbital state vectors (position and velocity). Etymology The word '' osculate'' is Latin for "kiss". In mathematics, two curves osculate when they just touch, without (necessarily) crossing, at a point, where both have the same position and slope, i.e. the two curves "kiss". Kepler elements An osculating orbit and the object's position upon it can be fully described by the six standard Kepler orbital elements (osculating elements), which are easy to calculate as long as one knows the object's position and velocity relative to the central body. The osculating elements would remain constant in the absence of perturbations. Real astronomical orbits experience pert ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Methone (moon)
Methone is a small, egg-shaped moon of Saturn that orbits out past Saturn's ring system, between the orbits of Mimas and Enceladus. It was discovered in 2004, though it wasn't until 2012 that it was imaged in detail by the '' Cassini'' spacecraft. History Methone was first discovered by the Cassini Imaging Team and given the temporary designation . Methone is also named (32). The '' Cassini'' spacecraft made two visits to Methone, and its closest approach was made on May 20, 2012 with a minimum distance of from it. The name Methone was approved by the IAU Working Group on Planetary System Nomenclature on January 21, 2005. It was ratified at the IAU General Assembly in 2006. Methone (Greek ''Μεθώνη'') was one of the Alkyonides, the seven beautiful daughters of the Giant Alkyoneus. Orbit Methone's orbit is perturbed by a 14:15 mean-motion resonance with the much larger Mimas. This causes its osculating orbital elements to vary with an amplitude of about in semi-ma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alkyoneus
In Greek mythology, Alcyoneus or Alkyoneus (; Ancient Greek: Ἀλκυονεύς ''Alkuoneus'') was a traditional opponent of the hero Heracles. He was usually considered to be one of the Gigantes (Giants (Greek mythology), Giants), the offspring of Gaia (mythology), Gaia born from the blood of the castrated Uranus (mythology), Uranus. According to the mythographer Bibliotheca (Pseudo-Apollodorus), Apollodorus, Alcyoneus' confrontation with Heracles was part of the Gigantomachy, the cosmic battle of the Giants (Greek mythology), Giants with the Olympian gods. In Apollodorus' account Alcyoneus and Porphyrion were the greatest of the Giants, and Alcyoneus was immortal as long as he was in his native land. When Heracles shot Alcyoneus with an arrow, Alcyoneus fell to the ground but then began to revive, so on the advice of Athena, Heracles dragged Alcyoneus out of his homeland where Alcyoneus then died. For the poet Pindar, Heracles' battle with Alcyoneus (whom he calls a herdsman), ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Giant (mythology)
In folklore, giants (from Ancient Greek: '' gigas'', cognate giga-) are beings of human-like appearance, but are at times prodigious in size and strength or bear an otherwise notable appearance. The word ''giant'' is first attested in 1297 from Robert of Gloucester's chronicle. It is derived from the ''Gigantes'' ( grc-gre, Γίγαντες) of Greek mythology. Fairy tales such as '' Jack the Giant Killer'' have formed the modern perception of giants as dimwitted ogres, sometimes said to eat humans, while other giants tend to eat the livestock. The antagonist in ''Jack and the Beanstalk'' is often described as a giant. In some more recent portrayals, like those of Jonathan Swift and Roald Dahl, some giants are both intelligent and friendly. Literary and cultural analysis Giants appear in the folklore of cultures worldwide as they represent a relatively simple concept. Representing the human body enlarged to the point of being monstrous, giants evoke terror and remind humans ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cassini–Huygens
''Cassini–Huygens'' ( ), commonly called ''Cassini'', was a space research, space-research mission by NASA, the European Space Agency (ESA), and the Italian Space Agency (ASI) to send a space probe to study the planet Saturn and its system, including its Rings of Saturn, rings and Moons of Saturn, natural satellites. The Large Strategic Science Missions, Flagship-class robotic spacecraft comprised both NASA's ''Cassini'' space probe and ESA's Huygens (spacecraft), ''Huygens'' lander (spacecraft), lander, which landed on Saturn's largest moon, Titan (moon), Titan. ''Cassini'' was the fourth space probe to visit Saturn and the first to enter its orbit, where it stayed from 2004 to 2017. The two craft took their names from the astronomers Giovanni Domenico Cassini, Giovanni Cassini and Christiaan Huygens. Launched aboard a Titan IV, Titan IVB/Centaur on October 15, 1997, ''Cassini'' was active in space for nearly 20 years, with 13 years spent orbiting Saturn and studying the pla ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Voyager 2
''Voyager 2'' is a space probe launched by NASA on August 20, 1977, to study the outer planets and interstellar space beyond the Sun's heliosphere. As a part of the Voyager program, it was launched 16 days before its twin, ''Voyager 1'', on a trajectory that took longer to reach gas giants Jupiter and Saturn but enabled further encounters with ice giants Uranus and Neptune. ''Voyager 2'' remains the only spacecraft to have visited either of the ice giant planets. ''Voyager 2'' was the fourth of five spacecraft to achieve Solar escape velocity, which allowed it to leave the Solar System. ''Voyager 2'' successfully fulfilled its primary mission of visiting the Jovian system in 1979, the Saturnian system in 1981, Uranian system in 1986, and the Neptunian system in 1989. The spacecraft is now in its extended mission of studying interstellar space. It has been operating for as of ; , it has reached a distance of from Earth. The probe entered interstellar space on November 5, 2 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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S, or s, is the nineteenth letter in the Latin alphabet, used in the modern English alphabet, the alphabets of other western European languages and others worldwide. Its name in English is ''ess'' (pronounced ), plural ''esses''. History Origin Northwest Semitic šîn represented a voiceless postalveolar fricative (as in 'ip'). It originated most likely as a pictogram of a tooth () and represented the phoneme via the acrophonic principle. Ancient Greek did not have a phoneme, so the derived Greek letter sigma () came to represent the voiceless alveolar sibilant . While the letter shape Σ continues Phoenician ''šîn'', its name ''sigma'' is taken from the letter ''samekh'', while the shape and position of ''samekh'' but name of ''šîn'' is continued in the '' xi''. Within Greek, the name of ''sigma'' was influenced by its association with the Greek word (earlier ) "to hiss". The original name of the letter "sigma" may have been ''san'', but due to the complica ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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