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Discovery
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| Discovered by | Charles T. Kowal |
| Discovery date | September 11, 1974[1] |
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Designations
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| Adjective | Ledean |
| Mean orbit radius | 11,160,000 km[2] |
| Eccentricity | 0.16[2] |
| Orbital period | 240.92 d (0.654 a)[2] |
| Average orbital speed | 3.4 km/s |
| Inclination | 27.46° (to the ecliptic) 29.01° (to Jupiter's equator)[2] |
| Satellite of | Jupiter |
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Physical characteristics
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| Mean radius | 10 km |
| Surface area | ~1250 km² |
| Volume | ~4200 km³ |
| Mass | 1.1×1016 kg |
| Mean density | 2.6 g/cm³ (assumed) |
| Equatorial surface gravity | ~0.0073 m/s2 (0.001 g) |
| Escape velocity | ~0.012 km/s |
| Albedo | 0.04 (assumed) |
| Temperature | ~124 K |
| Apparent magnitude | 20.2 [3] |
Leda (
/ˈliːdə/ LEE-də; Greek: Λήδα), also known as Jupiter XIII, is a prograde irregular satellite of Jupiter. It was discovered by Charles T. Kowal at the Mount Palomar Observatory on September 14, 1974, after three nights' worth of photographic plates had been taken (September 11 through 13; Leda appears on all of them).[1][4] It was named after Leda, who was a lover of Zeus, the Greek equivalent of Jupiter (who came to her in the form of a swan). Kowal suggested the name and the IAU endorsed it in 1975.[5]
Leda belongs to the Himalia group, five moons orbiting between 11 and 13 Gm from Jupiter at an inclination of about 27.5°.[2] The orbital elements given here are as of January 2000, but they are continuously changing due to solar and planetary perturbations.
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In fiction [link]
- The 1956 British film Fire Maidens from Outer Space was set on Jupiter's 13th moon, although this film was made before the discovery of Leda in 1974.
See also [link]
References [link]
- ^ a b Kowal, C. T.; Aksnes, K.; Marsden, B. G.; and Roemer, E. (1974). "Thirteenth satellite of Jupiter". Astronomical Journal 80: 460–464. Bibcode 1975AJ.....80..460K. DOI:10.1086/111766. https://adsabs.harvard.edu//full/seri/AJ.../0080//0000460.000.html.
- ^ a b c d e Jacobson, R. A. (2000). "The orbits of outer Jovian satellites". Astronomical Journal 120 (5): 2679. Bibcode 2000AJ....120.2679J. DOI:10.1086/316817.
- ^ "Leda Statistics". https://www.solarviews.com/eng/leda.htm. Retrieved 2007-10-01.
- ^ IAUC 2702: Probable New Satellite of Jupiter 1974 September (discovery)
- ^ Marsden, B. G. (7 October 1974). "Satellites of Jupiter". IAUC Circular 2846. https://www.cbat.eps.harvard.edu/iauc/02800/02846.html.
External links [link]
- Leda Profile by NASA's Solar System Exploration
- David Jewitt pages
- Jupiter's Known Satellites (by Scott S. Sheppard)
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https://wn.com/Leda_(moon)
Web of Passion
Web of Passion (also released as Leda, original French title: À double tour) is a 1959 French suspense thriller film directed by Claude Chabrol and based on the novel The Key to Nicholas Street by American writer Stanley Ellin. It was Chabrol's first film in the thriller genre, which would be his genre of choice for the rest of his career. The film had a total of 1,445,587 admissions in France.
Plot
Leda (Antonella Lualdi), the mistress of the wealthy Henri Marcoux is murdered and the family accuses the milkman of committing the crime. But Marcoux's daughter's fiance (Jean-Paul Belmondo) suspects that Leda may have been murdered by someone else.
Cast
Notes
Belmondo plays a character named Laszlo Kovacs, which was the alias of his character Michel Poiccard in Breathless
38 Leda
38 Leda /ˈliːdə/ is a large, dark main-belt asteroid that was discovered by French astronomer J. Chacornac on January 12, 1856, and named after Leda, the mother of Helen of Troy in Greek mythology. In the Tholen classification system, it is categorized as a carbonaceous C-type asteroid, while the Bus asteroid taxonomy system lists it as a Cgh asteroid.
Leda has been studied by radar. During 2002, 38 Leda was observed by radar from the Arecibo Observatory. The return signal matched an effective diameter of 116 ± 13 km. This is consistent with the asteroid dimensions computed through other means. Based upon a light curve that was generated from photometric observations of this asteroid at Pulkovo Observatory, it has a rotation period of 12.834 ± 0.001 hours and varies in brightness by 0.15 ± 0.01 in magnitude.
References
External links
LEDA 074886
LEDA 074886, also known as PGC 74886, is a dwarf galaxy with a rare rectangular shape, located at a distance of about 70,000,000 light-years (21,000,000 pc) in the Eridanus constellation. The galaxy was detected in a wide field of view image taken by Subaru Telescope using the Subaru Prime Focus Camera (Suprime-Cam). The Keck Telescope discovered a rapidly spinning, thin disc with a side on orientation lurking at the center of LEDA 074886. It is believed that unless LEDA 074886 merges with a similarly aligned galaxy, it may lose its corners over the next billion years. LEDA 074886 has a mass of around 109M⊙ (Compared to the Milky Way's mass of about 1012 M⊙).
Location
LEDA 074886 is located in the celestial sphere at an azimuth (
) of 03h 40m 43.2s, and a declination (
) of −18° 38′ 43″ (J2000). It is located within the Galactic corona of NGC 1407, a massive spherical galaxy which is located approximately 50 thousand parsecs to the northwest of LEDA 074886.
See also
Moon
The Moon (in Greek: σελήνη Selene, in Latin: Luna) is Earth's only natural satellite. It is one of the largest natural satellites in the Solar System, and, among planetary satellites, the largest relative to the size of the planet it orbits (its primary). It is the second-densest satellite among those whose densities are known (after Jupiter's satellite Io).
The Moon is thought to have formed approximately 4.5 billion years ago, not long after Earth. There are several hypotheses for its origin; the most widely accepted explanation is that the Moon formed from the debris left over after a giant impact between Earth and a Mars-sized body called Theia.
The Moon is in synchronous rotation with Earth, always showing the same face with its near side marked by dark volcanic maria that fill between the bright ancient crustal highlands and the prominent impact craters. It is the second-brightest regularly visible celestial object in Earth's sky after the Sun, as measured by illuminance on Earth's surface. Although it can appear a very bright white, its surface is actually dark, with a reflectance just slightly higher than that of worn asphalt. Its prominence in the sky and its regular cycle of phases have, since ancient times, made the Moon an important cultural influence on language, calendars, art, and mythology.
Moon (visual novel)
Moon (styled as Moon.) is a Japanese adult visual novel developed by Tactics, a brand of Nexton, released on November 21, 1997 playable on Windows PCs. The game was described by the development team as a "Reaching the Heart AVG" (心に届くAVG Kokoro ni Todoku AVG). The story follows the protagonist Ikumi Amasawa, a girl who joins an organization called Fargo in the hopes of discovering why and how her mother died, who was a member of the same group. The gameplay in Moon follows a branching plot line which offers pre-determined scenarios with courses of interaction, and focuses on the three female main characters. The game ranked twice in the national top 50 for best-selling PC games sold in Japan.
Much of the staff that created the game later became the founding members of the visual novel brand Key. Moon was the starting point for Key's origins, and was the first time the principal Key team was formed. A novel based on the game written by Midori Tateyama was released in July 1998 by Movic. The game's original soundtrack was released bundled with Dōsei's soundtrack in August 2000 at Comiket 58; Dōsei was Tactics' first game. Moon has been referenced in other media not directly related to the game, such as in Tactics' third game One: Kagayaku Kisetsu e, and in the second anime adaptation of Key's first game Kanon.
Natural satellite
A natural satellite is a celestial body that orbits another celestial body of greater mass (e.g., a planet, star, or dwarf planet), which is called its primary. For example, the Moon is a natural satellite of Earth, and Earth is a natural satellite of the Sun.
In the Solar System there are 173 known natural satellites which orbit within 6 planetary satellite systems. In addition, several other objects are known to have satellites, including three IAU-listed dwarf planets: Pluto, Haumea, and Eris.As of January 2012, over 200 minor-planet moons have been discovered. There are 76 known objects in the asteroid belt with satellites (five with two each), four Jupiter trojans, 39 near-Earth objects (two with two satellites each), and 14 Mars-crossers. There are also 84 known natural satellites of trans-Neptunian objects. Some 150 additional small bodies have been observed within the rings of Saturn, but only a few were tracked long enough to establish orbits. Planets around other stars are likely to have satellites as well, and although numerous candidates have been detected to date, none have yet been confirmed.
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