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For the moon of Jupiter, see Metis (moon). TemplateInfobox Planet.--> Metis (, or as in Greek Μήτις
9 Metis  
Discovery
Discovered by A. Graham
Discovery date April 25, 1848
Designations
Alternative names 1974 QU2
Minor planet
category		 Main belt
Epoch July 14, 2004 (JD 2453200. Events 1607 - Eighty Years' War: The Dutch fleet destroys the anchored Spanish fleet at Gibraltar. Year 1848 ( MDCCCXLVIII) was a Leap year starting on Saturday (link will display the full calendar of the Gregorian Calendar (or a Leap A provisional designation in astronomy is the naming convention applied to Astronomical objects immediately following their discovery The asteroid belt is the region of the Solar System located roughly between the orbits of the Planets Mars and Jupiter. 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 Astronomy, an epoch is a moment in time used as a reference for the Orbital elements of a Celestial body. Events 1223 - Louis VIII becomes King of France upon the death of his father Philip II of France. "MMIV" redirects here For the Modest Mouse album see " Baron von Bullshit Rides Again " The Julian date (JD is the interval of time in days and fractions of a day since 4713 B 5)
Aphelion 400. In Celestial mechanics, an apsis, plural apsides (ˈæpsɨdɪːz is the point of greatest or least distance of the Elliptical orbit of an object from 548 Gm (2. 678 AU)
Perihelion 313. In Celestial mechanics, an apsis, plural apsides (ˈæpsɨdɪːz is the point of greatest or least distance of the Elliptical orbit of an object from 556 Gm (2. 096 AU)
Semi-major axis 357. In Geometry, the semi-major axis (also semimajor axis) is used to describe the dimensions of ellipses and hyperbolae 052 Gm (2. For other meanings see Giga (disambiguation Giga- (symbol G is a prefix in the SI system of units denoting 109 The metre or meter is a unit of Length. It is the basic unit of Length in the Metric system and in the International 387 AU)
Eccentricity 0. The astronomical unit ( AU or au or au or sometimes ua) is a unit of Length based on the distance from the Earth to the In Astrodynamics, under standard assumptions, any Orbit must be of Conic section shape 122
Orbital period 1346. The orbital period is the time taken for a given object to make one complete Orbit about another object 815 d (3. A day (symbol d is a unit of Time equivalent to 24 Hours and the duration of a single Rotation of planet Earth with respect to the 69 a)
Average orbital speed 19. In Astronomy, a Julian year (symbol a) is a unit of measurement of Time defined 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 21 km/s
Mean anomaly 274. The second ( SI symbol s) sometimes abbreviated sec, is the name of a unit of Time, and is the International System of Units In the study of orbital dynamics the mean anomaly of an orbiting body is the Angle the body would have traveled about the center of the orbit's Auxiliary circle 183°
Inclination 5. Inclination in general is the Angle between a Reference plane and another plane or axis of direction 576°
Longitude of ascending node 68. This article describes the unit of angle For other meanings see Degree. The longitude of the ascending node (☊ or Ω is one of the Orbital elements used to specify the Orbit of an object in space 982°
Argument of perihelion 5. The argument of periapsis (or argument of perifocus) ( ω) is the Orbital element describing the Angle of an Orbiting body's periapsis 489°
Physical characteristics
Dimensions 235×195×140 km[1][2]
Mass ~9×1018 kg
Mean density ~2. Mass is a fundamental concept in Physics, roughly corresponding to the Intuitive idea of how much Matter there is in an object The density of a material is defined as its Mass per unit Volume: \rho = \frac{m}{V} Different materials usually have different 7 g/cm³[3]
Equatorial surface gravity ~0. A cubic centimetre or cubic centimeter (symbol cm3 —the abbreviation cc, though widely used is deprecated is a commonly used unit of Volume The surface gravity, g, of an astronomical or other object is the Gravitational acceleration experienced at its surface 070 m/s²
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 11 km/s
Rotation period 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 2116 d (5. 078 h)[4]
Albedo 0. The albedo of an object is the extent to which it diffusely reflects light from the sun 243 (geometric)[5]
Temperature ~173 K
max: 282 K (+9° C)[6]
Spectral type S-type[7]
Apparent magnitude 8. The geometric albedo of an astronomical body is the ratio of its actual brightness at zero phase angle (i 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 The kelvin (symbol K) is a unit increment of Temperature and is one of the seven SI base units The Kelvin scale is a thermodynamic The Celsius Temperature scale was previously known as the centigrade scale. S-type asteroids are of a silicaceous ( stony) composition hence the name The apparent magnitude ( m) of a celestial body is a measure of its Brightness as seen by an observer on Earth, normalized to the value 1[8] to 11. 83
Absolute magnitude 6. In Astronomy, absolute magnitude (also known as absolute visual magnitude) is the Apparent magnitude an object would have if it were at a standard 28
Angular diameter 0. The angular diameter of an object as seen from a given position is the "visual diameter" of the object measured as an angle 23" to 0. 071"

9 Metis (pronounced /ˈmiːtɪs/, Greek: Μήτις) is one of the largest main belt asteroids. Greek (el ελληνική γλώσσα or simply el ελληνικά — "Hellenic" is an Indo-European language, spoken today by 15-22 million people mainly The asteroid belt is the region of the Solar System located roughly between the orbits of the Planets Mars and Jupiter. Asteroids, sometimes called Minor planets or planetoids', are bodies—primarily of the inner Solar System —that are smaller than planets but It is composed of silicates and metallic nickel-iron, and may be the core remnant of a large asteroid that was destroyed by an ancient collision. For the Artificial intelligence Androids of the 1990s Science fiction series Space Above and Beyond, see Silicate (AI The M acro E xpansion T emplate A ttribute L anguage complements TAL, providing macros which allow the reuse of code across Nickel (ˈnɪkəl is a metallic Chemical element with the symbol Ni and Atomic number 28 Iron (ˈаɪɚn is a Chemical element with the symbol Fe (ferrum and Atomic number 26 [9]

Contents

Discovery and naming

The first 10 asteroids profiled against Earth's Moon. 9 Metis is second from right.
The first 10 asteroids profiled against Earth's Moon. 9 Metis is second from right.

Metis was discovered by Andrew Graham on April 25, 1848; it was his only asteroid discovery. Events 1607 - Eighty Years' War: The Dutch fleet destroys the anchored Spanish fleet at Gibraltar. Year 1848 ( MDCCCXLVIII) was a Leap year starting on Saturday (link will display the full calendar of the Gregorian Calendar (or a Leap [10] It is also the only asteroid to have been discovered as a result of observations from Ireland. Ireland (pronounced /ˈaɾlənd/ Éire) is the third largest island in Europe, and the twentieth-largest island in the world Its name comes from the mythological Metis, a Titaness and Oceanid, daughter of Tethys and Oceanus. In Greek mythology, Metis (Μῆτις was of the Titan generation and like several primordial figures an Oceanid, in the sense that Metis was born of In Greek mythology, the Titans ( Greek: Tītā́n; plural Tītânes) were a race of powerful Deities that ruled during the legendary In Greek and Roman mythology, the Oceanids ( Greek: Ὠκεανίδαι pl In Classical Greek mythology, Tethys (Greek Τηθύς) daughter of Uranus and Gaia ( Hesiod, Theogony lines Ocean (Ὠκεανός was believed to be the world-ocean in Classical antiquity, which the ancient Romans and Greeks considered to be [11] The name Thetis was also considered and rejected (it would later devolve to 17 Thetis). TemplateInfobox Planet. --> 17 Thetis (ˈθiːtɪs Θέτις) is a large Main belt

Characteristics

Metis' direction of rotation is unknown at present, due to ambiguous data. Lightcurve analysis indicates that Metis' pole points towards either ecliptic coordinates (β, λ) = (23°, 181°) or (9°, 359°) with a 10° uncertainty. The ecliptic coordinate system is a Celestial coordinate system that uses the Ecliptic for its Fundamental plane. [1] The equivalent equatorial coordinates are (α, δ) = (12. The equatorial coordinate system is probably the most widely used Celestial coordinate system, whose equatorial coordinates are Declination (\delta 7 h, 21°) or (23. 7 h, 8°). This gives an axial tilt of 72° or 76°, respectively. In Astronomy, axial tilt is the Inclination angle of a planet's rotational axis in relation to its orbital plane.

Hubble space telescope images[2][12] and lightcurve analyses[1] are in agreement that Metis has an irregular elongated shape with one pointed and one broad end. The Hubble Space Telescope ( HST; also known colloquially as "the Hubble" or just "Hubble" is a space telescope that was carried into [1][12] Radar observations suggest the presence of a significant flat area,[13] in agreement with the shape model from lightcurves.

The surface composition has been estimated as 30-40% metal-bearing olivine and 60-70% Ni-Fe metal. The Mineral olivine (when gem-quality also called Peridot) is a Magnesium Iron silicate with the formula ( Mg Nickel (ˈnɪkəl is a metallic Chemical element with the symbol Ni and Atomic number 28 Iron (ˈаɪɚn is a Chemical element with the symbol Fe (ferrum and Atomic number 26 [9]

Light curve data on Metis led to an assumption that it could have a satellite. A natural satellite or moon is a Celestial body that Orbits a Planet or smaller body which is called the primary. However, subsequent observations failed to confirm this. [14][15] Later searches with the Hubble Space Telescope in 1993 found no satellites. The Hubble Space Telescope ( HST; also known colloquially as "the Hubble" or just "Hubble" is a space telescope that was carried into Year 1993 ( MCMXCIII) was a Common year starting on Friday (link will display full 1993 Gregorian calendar) [12]

Family relationships

Metis was once considered to be a member of an asteroid family known as the Metis family,[16] but more recent searches for prominent families did not recognize any such group, nor is a clump evident in the vicinity of Metis by visual inspection of proper orbital element diagrams. An asteroid family is a population of Asteroids that share similar Orbital elements, such as Semimajor axis, eccentricity, and orbital Inclination The proper orbital elements of an orbit are constants of motion of an object in space that remain practically unchanged over an astronomically long timescale

However, a spectroscopic analysis found strong spectral similarities between Metis and 113 Amalthea, and it is suggested that these asteroids may be remnants of a very old (at least ~1 Ga) dynamical family whose smaller members have been pulverised by collisions or perturbed away from the vicinity. In Astronomy, Geology, and Paleontology, Gya (for Giga years ago is often used as an unit of Time to denote length of The putative parent body is estimated to have been 300 to 600 km in diameter (Vesta-sized) and differentiated. TemplateInfobox Planet. --> 4 Vesta (ˈvɛstə Vesta is the second most massive object in the Asteroid belt In Planetary science, planetary differentiation is the process of separating out different constituents of a planetary body as a consequence of their physical or chemical Metis would be the relatively intact core remnant, and Amalthea a fragment of the mantle. [9] Coincidentally, both Metis and Amalthea have namesakes among Jupiter's inner moons. In Astronomy, an inner moon is a Natural satellite following a prograde, low inclination Orbit inwards of the large satellites of

Occultations

Metis has been observed to occult stars no less than 5 times. In Shia Islam The Occultation is a term used to designate the hidden state of the Imam of the Time. A star is a massive luminous ball of plasma. The nearest star to Earth is the Sun, which is the source of most of the Energy on Earth [17]

References

  1. ^ a b c d J. Torppa et al. , Shapes and rotational properties of thirty asteroids from photometric data, Icarus Vol. 164, p. 346 (2003).
  2. ^ a b A. D. Storrs et al. , A closer look at main belt asteroids 1: WF/PC images, Icarus Vol. 173, p. 409 (2005).
  3. ^ G. A. Krasinsky et al. , Hidden Mass in the Asteroid Belt, Icarus, Vol. 158, p. 98 (2002).
  4. ^ PDS lightcurve data
  5. ^ MSX Infrared minor planet survey (at PDS)
  6. ^ L. F. Lim et al. , Thermal infrared (8–13 µm) spectra of 29 asteroids: the Cornell Mid-Infrared Asteroid Spectroscopy (MIDAS) Survey, Icarus Vol. 173, p. 385 (2005).
  7. ^ asteroid lightcurve data file (March 2001)
  8. ^ Donald H. Menzel and Jay M. Pasachoff (1983). A Field Guide to the Stars and Planets, 2nd edition, Boston, MA: Houghton Mifflin, p. 391. ISBN 0395348358.  
  9. ^ a b c M. S. Kelley and M. J. Gaffey, 9 Metis and 113 Amalthea: A Genetic Asteroid Pair, Icarus Vol. 144, p. 27 (2000).
  10. ^ Graham, A. ; New Planet, Monthly Notices of the Royal Astronomical Society, Vol. 8, No. 6 (dated April 14, 1848!), p. Events 43 BC - Battle of Forum Gallorum: Mark Antony, besieging Julius Caesar 's assassin Decimus Junius Brutus in Year 1848 ( MDCCCXLVIII) was a Leap year starting on Saturday (link will display the full calendar of the Gregorian Calendar (or a Leap 146 (signed April 29, 1848; the discovery was first announced on April 27)
  11. ^ Graham, A. ; Metis, Monthly Notices of the Royal Astronomical Society, Vol. 8, No. 7 (dated May 12, 1848), pp. Events 1191 - Richard I of England marries Berengaria of Navarre. Year 1848 ( MDCCCXLVIII) was a Leap year starting on Saturday (link will display the full calendar of the Gregorian Calendar (or a Leap 147–150)
  12. ^ a b c Hubble Space Telescope observations
  13. ^ D. L. Mitchell et al. , Radar Observations of Asteroids 7 Iris, 9 Metis, 12 Victoria, 216 Kleopatra, and 654 Zelinda, Icarus Vol. 118, p. 105 (1995).
  14. ^ research at IMCCE (in French)
  15. ^ "other" reports of asteroid companions
  16. ^ J. French ( français,) is a Romance language spoken around the world by 118 million people as a native language and by about 180 to 260 million people G. Williams, Asteroid Families - An Initial Search, Icarus Vol. 96, p. 251 (1992).
  17. ^ W. M. Kissling et al. , The diameter of (9) Metis from the Occultation of SAO 190531, Proceedings of the Astronomical Society of Australia Vol 9, p. 150 (1991).

External links

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