NationMaster - Encyclopedia: Leda (moon)

Leda (lee'-də, IPA: [ˈliːdə]; Greek Λήδα), or Jupiter XIII, is a prograde irregular satellite of Jupiter that was discovered by Charles T. Kowal at the Mount Palomar Observatory on September 14, 1974, right after three nights' worth of photographic plates had been taken (September 11 through 13; Leda appears on all of them). It is named after the queen of Sparta who was the mother of Castor, Polydeuces, Clytemnestra and Helen of Troy (Zeus, in the form of a swan, was the father). Charles Thomas Kowal (born November 8, 1940) is an American astronomer. ... September 11 is the 254th day of the year in the Gregorian calendar (255th in leap years). ... 1974 (MCMLXXIV) was a common year starting on Tuesday. ... In physics, an orbit is the path that an object makes, around another object, whilst under the influence of a source of centripetal force, such as gravity. ... In classical geometry, a radius of a circle or sphere is any line segment from its center to its boundary. ... A kilometer (Commonwealth spelling: kilometre), symbol: km is a unit of length in the metric system equal to 1,000 metres (from the Greek words Ï‡Î¯Î»Î¹Î± (khilia) = thousand and Î¼ÎÏ„ÏÎ¿ (metro) = count/measure). ... The astronomical unit (AU or au or a. ... In astrodynamics, under standard assumptions any orbit must be of conic section shape. ... This article is about several astronomical terms (apogee & perigee, aphelion & perihelion, generic equivalents based on apsis, and related but rarer terms. ... A kilometer (Commonwealth spelling: kilometre), symbol: km is a unit of length in the metric system equal to 1,000 metres (from the Greek words Ï‡Î¯Î»Î¹Î± (khilia) = thousand and Î¼ÎÏ„ÏÎ¿ (metro) = count/measure). ... This article is about several astronomical terms (apogee & perigee, aphelion & perihelion, generic equivalents based on apsis, and related but rarer terms. ... A kilometer (Commonwealth spelling: kilometre), symbol: km is a unit of length in the metric system equal to 1,000 metres (from the Greek words Ï‡Î¯Î»Î¹Î± (khilia) = thousand and Î¼ÎÏ„ÏÎ¿ (metro) = count/measure). ... The orbital period is the time it takes a planet (or another object) to make one full orbit. ... A year is the time between two recurrences of an event related to the orbit of the Earth around the Sun. ... The circumference is the distance around a closed curve. ... A kilometer (Commonwealth spelling: kilometre), symbol: km is a unit of length in the metric system equal to 1,000 metres (from the Greek words Ï‡Î¯Î»Î¹Î± (khilia) = thousand and Î¼ÎÏ„ÏÎ¿ (metro) = count/measure). ... The velocity of an object is simply its speed in a particular direction. ... Inclination in general is the angle between a reference plane and another plane or axis of direction. ... The plane of the ecliptic is well seen in this picture from the 1994 lunar prospecting Clementine spacecraft. ... Moons of solar system scaled to Earths Moon A natural satellite is a moon (not capitalized), that is, any natural object that orbits a planet. ... Atmospheric characteristics Atmospheric pressure 70 kPa Hydrogen ~86% Helium ~14% Methane 0. ... Diameter is an AAA (authentication, authorization and accounting) protocol for applications such as network access or IP mobility. ... Area is a physical quantity expressing the size of a part of a surface. ... Square kilometre (US spelling: Square kilometer), symbol km², is an SI unit of surface area. ... Volume, also called capacity, is a quantification of how much space an object occupies. ... A cubic kilometre (symbol km³) is an SI derived unit of volume. ... Mass is a property of a physical object that quantifies the amount of matter and energy it is equivalent to. ... The international prototype, made of platinum-iridium, which is kept at the BIPM under conditions specified by the 1st CGPM in 1889. ... Density (symbol: Ï - Greek: rho) is a measure of mass per unit of volume. ... Gravity is a force of attraction that acts between bodies that have mass. ... Acceleration is the time rate of change of velocity, and at any point on a v-t graph, it is given by the slope of the tangent to that point In physics or physical science, acceleration (symbol: a) is defined as the rate of change (or derivative with respect to... In physics, for a given gravitational field and a given position, the escape velocity is the minimum speed an object without propulsion, at that position, needs to have to move away indefinitely from the source of the field, as opposed to falling back or staying in an orbit within a... Axial tilt is an astronomical term regarding the inclination angle of a planets rotational axis in relation to its orbital plane. ... Albedo is a ratio of scattered to incident electromagnetic radiation power, most commonly light. ... In thermodynamics, temperature is the physical property of a system that underlies the common notions of hot and cold â€”something that is hotter has the greater temperature. ... The kelvin (symbol: K) is the SI unit of temperature, and is one of the seven SI base units. ... diurnal (daily) rhythm of air pressure in northern Germany (black curve is air pressure) Atmospheric pressure is the pressure above any area in the Earths atmosphere caused by the weight of air. ... The pascal (symbol Pa) is the SI unit of pressure. ... An asteroid is a predominantly rocky body that orbits around its star. ... 38 Leda is a large, dark main belt asteroid. ... The International Phonetic Alphabet (IPA) is a system of phonetic notation devised by linguists to accurately and uniquely represent each of the wide variety of sounds (phones or phonemes) used in spoken human language. ... This article is about retrograde motion. ... In astronomy, an irregular satellite is a natural satellite following a distant, inclined, often retrograde orbit and believed to be captured as opposed to a regular satellite, formed in situ. ... Moons of solar system scaled to Earths Moon A natural satellite is a moon (not capitalized), that is, any natural object that orbits a planet. ... Atmospheric characteristics Atmospheric pressure 70 kPa Hydrogen ~86% Helium ~14% Methane 0. ... Charles Thomas Kowal (born November 8, 1940) is an American astronomer. ... Palomar Observatory is a privately-owned observatory located in San Diego County, California, 90 miles (145 km) southeast of Mount Wilson Observatory, on Palomar Mountain. ... September 14 is the 257th day of the year in the Gregorian calendar (258th in leap years). ... 1974 (MCMLXXIV) was a common year starting on Tuesday. ... September 11 is the 254th day of the year in the Gregorian calendar (255th in leap years). ... September 13 is the 256th day of the year (257th in leap years). ... Sparta (Doric: , Attic: ) is a city in southern Greece. ... In Greek mythology, Castor (or Kastor) and Polydeuces (sometimes called Pollux) were the twin sons of Leda and the brothers of Helen of Troy and Clytemnestra. ... In Greek mythology, Castor (or Kastor) and Polydeuces (sometimes called Pollux) were the twin sons of Leda and the brothers of Helen of Troy and Clytemnestra. ... Clytemnestra (Greek: ÎšÎ»Ï…Ï„Î±Î¹Î¼Î½Î®ÏƒÏ„ÏÎ± KlytaimnÃ©stra, praiseworthy wooing) was the wife of Agamemnon, king of the Ancient Greek kingdom of Mycenae or Argos. ... In Greek mythology Helen () was reputed to be the most beautiful woman in the world. ... Statue of Zeus Phidias created the 12-m (40-ft) tall statue of Zeus at Olympia about 435 BC. The statue was perhaps the most famous sculpture in Ancient Greece, imagined here in a 16th century engraving In Greek mythology, Zeus (in Greek: nominative: Î–ÎµÏÏ‚ ZeÃºs, genitive: Î”Î¹ÏŒÏ‚ DÃos) is... Genera/Species Swans are large water birds of the family Anatidae, which also includes geese and ducks. ...

Leda belongs to the Himalia group, five moons orbiting between 11 and 13 Gm from Jupiter at an inclination of about 27.5°. The Himalia group is a dynamical grouping of Jupiters moons, which share similar orbits. ...

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