 | |
Discovery | |
|---|---|
| Discovered by | Stephen P. Synnott / Voyager 1 |
| Discovery date | March 5, 1979 |
| Periapsis | 218,000 km[1] |
| Apoapsis | 226,000 km[1] |
| Mean orbit radius | 221889. Stephen P Synnott is a Voyager scientist who discovered several moons of Jupiter, Saturn, Uranus, and Neptune. Events 363 - Roman Emperor Julian moves from Antioch with an army of 90000 to attack the Sassanid Empire, in a Year 1979 ( MCMLXXIX) was a Common year starting on Monday (link displays the 1979 Gregorian calendar) In Physics, an orbit is the gravitationally curved path of one object around a point or another body for example the gravitational orbit of a planet around a star In Celestial mechanics, an apsis, plural apsides (ˈæpsɨdɪːz is the point of greatest or least distance of the Elliptical orbit of an object from The kilometre ( American spelling: kilometer) symbol km is a unit of Length in the Metric system, equal to one thousand In Celestial mechanics, an apsis, plural apsides (ˈæpsɨdɪːz is the point of greatest or least distance of the Elliptical orbit of an object from The kilometre ( American spelling: kilometer) symbol km is a unit of Length in the Metric system, equal to one thousand Remote Authentication Dial In User Service ( RADIUS) is a networking protocol that provides centralized access authorization and accounting management for people or computers 0 ± 0. 6 km (3. The kilometre ( American spelling: kilometer) symbol km is a unit of Length in the Metric system, equal to one thousand 11 RJ)[2] |
| Eccentricity | 0. In Astrodynamics, under standard assumptions, any Orbit must be of Conic section shape 0175 ± 0. 0004[2] |
| Orbital period | 0. The orbital period is the time taken for a given object to make one complete Orbit about another object 674536 ± 0. 000001 d (16 h 11. 3 min)[2] |
| Average orbital speed | 23. The orbital speed of a body generally a Planet, a Natural satellite, an artificial satellite, or a Multiple star, is the speed at which it 923 km/s[1] |
| Inclination | 1. Inclination in general is the Angle between a Reference plane and another plane or axis of direction 076 ±0. 003° (to Jupiter's equator)[2] |
| Satellite of | Jupiter |
Physical characteristics | |
| Dimensions | 116×98×84 km[3] |
| Mean radius | 49. A natural satellite or moon is a Celestial body that Orbits a Planet or smaller body which is called the primary. 3 ± 2. 0 km[3] |
| Volume | ~500,000 km³[1] |
| Mass | 4. The volume of any solid plasma vacuum or theoretical object is how much three- Dimensional space it occupies often quantified numerically CM3 redirects here If you were looking for the 3rd game in the Cooking Mama series abbreviated as CM3 see here. Mass is a fundamental concept in Physics, roughly corresponding to the Intuitive idea of how much Matter there is in an object 3×1017 kg[1] |
| Mean density | 0. The density of a material is defined as its Mass per unit Volume: \rho = \frac{m}{V} Different materials usually have different 86 g/cm³ (assumed) |
| Equatorial surface gravity | ~0. The surface gravity, g, of an astronomical or other object is the Gravitational acceleration experienced at its surface 020 m/s² (0. 004 g)[1] |
| Escape velocity | ~0. In Physics, escape velocity is the speed where the Kinetic energy of an object is equal to the magnitude of its Gravitational potential energy 040 km/s[1] |
| Rotation period | synchronous |
| Axial tilt | zero |
| Albedo | 0. The rotation period of an astronomical object is the time it takes to complete one revolution around its Axis of rotation relative to the background stars In Astronomy, synchronous rotation is a planetological term describing a body orbiting another where the orbiting body takes as long to rotate In Astronomy, axial tilt is the Inclination angle of a planet's rotational axis in relation to its orbital plane. The albedo of an object is the extent to which it diffusely reflects light from the sun 047 ± 0. 003[4] |
| Temperature | ~124 K |
Thebe (thee'-bee, IPA: /ˈθiːbi/, Greek Θήβη) or Jupiter XIV, is the fourth of Jupiter's known moons (by distance from the planet). Temperature is a physical property of a system that underlies the common notions of hot and cold something that is hotter generally has the greater temperature A natural satellite or moon is a Celestial body that Orbits a Planet or smaller body which is called the primary. A planet, as defined by the International Astronomical Union (IAU is a celestial body Orbiting a Star or stellar remnant that is It was discovered by Stephen P. Synnott in images from the Voyager 1 space probe taken on March 5, 1979 and was initially given the provisional designation S/1979 J 2. Stephen P Synnott is a Voyager scientist who discovered several moons of Jupiter, Saturn, Uranus, and Neptune. The Voyager 1 spacecraft is a 722-kilogram robotic Space probe of the outer Solar system and beyond launched September 5, Events 363 - Roman Emperor Julian moves from Antioch with an army of 90000 to attack the Sassanid Empire, in a Year 1979 ( MCMLXXIX) was a Common year starting on Monday (link displays the 1979 Gregorian calendar) [5][6] Later, it was found on images dating back to February 27, 1979. Events 1560 - The Treaty of Berwick, which would expel the French from Scotland, is signed by England and the Congregation Year 1979 ( MCMLXXIX) was a Common year starting on Monday (link displays the 1979 Gregorian calendar) In 1983 it was officially named after the mythological nymph Thebe who was a lover of Zeus (the Greek equivalent of Jupiter). In Greek mythology, a nymph is any member of a large class of mythological entities in human female form Zeus (zjuːs in Greek: nominative: Zeús /zdeús/ genitive: Diós; Modern Greek /'zefs/ in Greek mythology [7]
Contents |
Orbit
Thebe is the outermost of the inner Jovian moons. It orbits Jupiter at a distance of ~222,000 km (3. 11 Jupiter radii). The orbit of Thebe has an eccentricity of ~0. In Astrodynamics, under standard assumptions, any Orbit must be of Conic section shape 018 and an inclination of ~1. Inclination in general is the Angle between a Reference plane and another plane or axis of direction 08° relative to the equator of Jupiter. [2] These values are unusually high for an inner satellite and can be explained by the past influence of the innermost Galilean satellite Io; in the past, several mean motion resonances with Io would have passed through Thebe's orbit as Io gradually receded from Jupiter, and these excited Thebe's orbit. The Galilean moons are the four moons of Jupiter discovered by Galileo Galilei. TemplateInfobox Planet.--> Io (ˈaɪoʊ, or as Greek In Celestial mechanics, an orbital resonance occurs when two Orbiting bodies exert a regular periodic gravitational influence on each other usually due to their TemplateInfobox Planet.--> Io (ˈaɪoʊ, or as Greek [8]
The orbit of Thebe lies near the outer edge of the Thebe Gossamer Ring, which is composed of the dust ejected from the satellite. The planet Jupiter has a system of rings known as the rings of Jupiter or the Jovian ring system. [9]
Physical characteristics
Thebe is irregularly shaped, with the closest ellipsoidal approximation being 116x98x84 km. An ellipsoid is a type of quadric surface that is a higher dimensional analogue of an Ellipse. Its bulk density and mass are not known but assuming that it mean density is like that of Amalthea (~0. The density of a material is defined as its Mass per unit Volume: \rho = \frac{m}{V} Different materials usually have different 86 g/cm³)[3] its mass can be estimated at ~4. 3×1017 kg.
Thebe rotates synchronously with its orbital period, keeping one face always looking toward the planet, similarly to all inner satellites of Jupiter. In Astronomy, synchronous rotation is a planetological term describing a body orbiting another where the orbiting body takes as long to rotate Its orientation is such that the long axis always points to Jupiter. At the surface points closest to and furthest from Jupiter, the surface is thought to near the edge of the Roche lobe where Thebe's gravity is almost balanced by the centrifugal force. The Roche lobe is the region of Space around a Star in a binary system within which orbiting material is gravitationally bound to that star As a result, the escape velocity there is very small, allowing dust to escape easily after meteorite impacts to form the Thebe Gossamer Ring. In Physics, escape velocity is the speed where the Kinetic energy of an object is equal to the magnitude of its Gravitational potential energy [8]
The surface of Thebe is dark and appears to be reddish in color. [4] There is a substantial asymmetry between leading and trailing hemispheres: the leading hemisphere is 1. 3 times brighter than the trailing one. The asymmetry is probably caused by the higher velocity and frequency of impacts on the leading hemisphere, which excavate a bright material (ice) from the interior of the moon. In the broadest sense the term impact crater can be applied to any depression natural or manmade resulting from the high velocity impact of a projectile with larger body [4] The surface of Thebe is heavily cratered. There appear to be at least three or four impact craters that are very large: each is roughly comparable in size to Thebe's own diameter. In the broadest sense the term impact crater can be applied to any depression natural or manmade resulting from the high velocity impact of a projectile with larger body The largest (~40 km) crater is situated on the anti-Jovian side of the moon and is called Zethus (the only surface feature on Thebe to have received a name). There are several bright spots at the rim of this crater. The rim of a crater is the part that extends above the height of the local surface usually in a circular or elliptical pattern [3]
Exploration
Thebe was discovered in Voyager 1 images by Steve Synnott, a member of the Voyager navigation team. The Voyager 1 spacecraft is a 722-kilogram robotic Space probe of the outer Solar system and beyond launched September 5, [6] However, before the Galileo spacecraft arrived at Jupiter, knowledge about it was very limited. Galileo was an Unmanned spacecraft sent by NASA to study the Planet Jupiter and its moons Named after the Astronomer Galileo imaged almost all of the surface of Thebe and put constraints on its composition. [3]
See also
References
- ^ a b c d e f g Calculated on the basis of other parameters
- ^ a b c d e Cooper, N. The planet Jupiter has a system of rings known as the rings of Jupiter or the Jovian ring system. J. ; Murray, C. D. ; Porco, C. C. ; Spitale, J. N. (2006). "Cassini ISS astrometric observations of the inner jovian satellites, Amalthea and Thebe". ICARUS 181: 223–234. doi:. A digital object identifier ( DOI) is a permanent identifier given to an Electronic document.
- ^ a b c d e Thomas, P. C. ; Burns, J. A. ; Rossier, L. ; et. al. (1998). "The Small Inner Satellites of Jupiter". ICARUS 135: 360–371. doi:. A digital object identifier ( DOI) is a permanent identifier given to an Electronic document.
- ^ a b c Simonelli, D. P. ; Rossiery, L. ; Thomas, P. C. ; et. al. (2000). "Leading/Trailing Albedo Asymmetries of Thebe, Amalthea, and Metis". ICARUS 147: 353–365. doi:. A digital object identifier ( DOI) is a permanent identifier given to an Electronic document.
- ^ IAUC 3470: Satellites of Jupiter 1980 April 28 (discovery)
- ^ a b Synnott, S. Year 1980 ( MCMLXXX) was a Leap year starting on Tuesday (link displays the 1980 Gregorian calendar) Events 1192 - Assassination of Conrad of Montferrat (Conrad I King of Jerusalem, in Tyre, two days after his title P. (1980). "1979J2: The Discovery of a Previously Unknown Jovian Satellite". Science 210 (4471): 786-788.
- ^ IAUC 3872: Satellites of Jupiter and Saturn 1983 September 30 (naming the moon)
- ^ a b Burns, J. Year 1983 ( MCMLXXXIII) was a Common year starting on Saturday (link displays the 1983 Gregorian calendar) Events 1399 - Henry IV is proclaimed King of England. 1744 - France and Spain defeat the A. ; D. P. Simonelli & M. R. Showalter et al. (2004), "Jupiter’s Ring-Moon System", in Bagenal, F. ; Dowling, T. E. ; McKinnon, W. B. , Jupiter: The planet, Satellites and Magnetosphere, Cambridge University Press, <http://www.astro.umd.edu/~hamilton/research/preprints/BurSimSho03.pdf>
- ^ Burns, J. A. ; Showalter, M. R. ; Hamilton, D. P. ; et. al. (1999). "The Formation of Jupiter's Faint Rings". Science 284: 1146-1150. doi:. A digital object identifier ( DOI) is a permanent identifier given to an Electronic document.
External links
Thebe Profile by NASA's Solar System Exploration
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