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Encyclopedia > 28978 Ixion
28978 Ixion
Discovery
Discovered by: Deep Ecliptic Survey
Discovery date: 22 May 2001
Orbital characteristics
Epoch December 31, 2006 (JD 2454100.5)
Aphelion distance: 7370.503 Gm (49.269 AU)
Perihelion distance: 4501.495 Gm (30.091 AU)
Semi-major axis: 5935.999 Gm (39.680 AU)
Eccentricity: 0.242
Orbital period: 91295.847 d (249.95 a)
Avg. orbital speed: 4.66 km/s
Mean anomaly: 268.546°
Inclination: 19.584°
Longitude of ascending node: 71.028°
Argument of perihelion: 298.779°
Physical characteristics
Dimensions: <822 km diameter
Surface area: <2.24×106 km²
Volume: <3.15×108 km³
Mass: <5.8×1020? kg
Mean density: 2.0? g/cm³
Equatorial surface gravity: <0.2297? m/s²
Escape velocity: <0.4346? km/s
Rotation period: ? d
Albedo: 0.15
Temperature: ~44 K
Spectral type: (moderately red; B-V=1.03, V-R=0.61)
Absolute magnitude: 3.244

28978 Ixion (IPA pronunciation: [ɪk'saɪ.ɒn], Wiktionary:Ixion) is a Kuiper belt object discovered on May 22, 2001. Ixion is a plutino (an object that has a 2:3 orbital resonance with Neptune); its estimated diameter of 800 km makes it the second largest plutino. It is named after Ixion, a figure from Greek mythology; it previously had the provisional designation 2001 KX76. The Deep Ecliptic Survey is a project to find Kuiper belt objects, using the facilities of the National Optical Astronomy Observatory. ... May 22 is the 142nd day of the year (143rd in leap years) in the Gregorian calendar. ... 2001 (MMI) was a common year starting on Monday of the Gregorian calendar. ... m. ... In astronomy, an epoch is a moment in time for which celestial coordinates or orbital elements are specified. ... December 31 is the 365th day of the year (366th in leap years) in the Gregorian calendar. ... For the Manfred Mann album, see 2006 (album). ... The Julian day or Julian day number (JDN) is the (integer) number of days that have elapsed since Monday, January 1, 4713 BC in the proleptic Julian calendar [1]. That day is counted as Julian day zero. ... A diagram of Keplerian orbital elements. ... A diagram of Keplerian orbital elements. ... The semi-major axis of an ellipse In geometry, the term semi-major axis (also semimajor axis) is used to describe the dimensions of ellipses and hyperbolae. ... Look up giga- in Wiktionary, the free dictionary. ... The or meter (see spelling differences) is a measure of length. ... The astronomical unit (AU or au or a. ... (This page refers to eccitricity in astrodynamics. ... The orbital period is the time it takes a planet (or another object) to make one full orbit. ... Look up day in Wiktionary, the free dictionary. ... In astronomy, a Julian year is a unit of time defined as exactly 365. ... 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 orbits around the barycenter of a system, usually around a more massive body. ... Look up second in Wiktionary, the free dictionary. ... In the study of orbital dynamics the mean anomaly is a measure of time, specific to the orbiting body p, which is a multiple of 2&#960; radians at and only at periapsis. ... Inclination in general is the angle between a reference plane and another plane or axis of direction. ... A degree (in full, a degree of arc, arc degree, or arcdegree), usually symbolized °, is a measurement of plane angle, representing 1/360 of a full rotation. ... The Longitude of the ascending node (☊, also noted Ω) is one of the orbital elements used to specify the orbit of an object in space. ... The argument of periapsis (ω) is the orbital element describing the angle between an orbiting bodys ascending node (the point where the body crosses the plane of reference from South to North) and its periapsis (the point of closest approach to the central body), measured in the orbital plane and... km redirects here. ... In mathematics, a spheroid is a quadric surface in three dimensions obtained by rotating an ellipse about one of its principal axes. ... The volume of a solid object is the three-dimensional concept of how much space it occupies, often quantified numerically. ... Unsolved problems in physics: What causes anything to have mass? The U.S. National Prototype Kilogram, which currently serves as the primary standard for measuring mass in the U.S. Mass is the property of a physical object that quantifies the amount of matter and energy it is equivalent to. ... The U.S. National Prototype Kilogram, which currently serves as the primary standard for measuring mass in the U.S. It was assigned to the United States in 1889 and is periodically recertified and traceable to the primary international standard, The Kilogram, held at the Bureau International des Poids et... In physics, density is mass m per unit volume V. For the common case of a homogeneous substance, it is expressed as: where, in SI units: ρ (rho) is the density of the substance, measured in kg·m-3 m is the mass of the substance, measured in kg V is... A cubic centimetre (cm3) is an SI derived unit of volume, equal to the volume of a cube with side length of 1 centi metre. ... The surface gravity of a Killing horizon is the acceleration, as exerted at infinity, needed to keep an object at the horizon. ... Space Shuttle Atlantis launches on mission STS-71. ... In astronomy, a rotation period is the time an astronomical object takes to complete one revolution around its rotation axis. ... Albedo is the ratio of reflected to incident electromagnetic radiation power. ... Fig. ... The kelvin (symbol: K) is a unit increment of temperature and is one of the seven SI base units. ... In astronomy, absolute magnitude is the apparent magnitude, m, an object would have if it were at a standard luminosity distance away from us, in the absence of interstellar extinction. ... Articles with similar titles include the NATO phonetic alphabet, which has also informally been called the “International Phonetic Alphabet”. For information on how to read IPA transcriptions of English words, see IPA chart for English. ... Artists rendering of the Kuiper Belt and hypothetical more distant Oort cloud. ... May 22 is the 142nd day of the year (143rd in leap years) in the Gregorian calendar. ... 2001 (MMI) was a common year starting on Monday of the Gregorian calendar. ... In astronomy, a plutino is a trans-Neptunian object that has a 3:2 orbital resonance with Neptune. ... In celestial mechanics, an orbital resonance occurs when two orbiting bodies exert a regular, periodic gravitational influence on each other. ... DIAMETER is an AAA protocol (Authentication, Authorization and Accounting) succeeding its predecessor RADIUS. // The name is a pun on the RADIUS protocol, which is the predecessor (a diameter is twice the radius). ... This article is about the Greek myth. ... The bust of Zeus found at Otricoli (Sala Rotonda, Museo Pio-Clementino, Vatican) Greek mythology is the body of stories belonging to the ancient Greeks concerning their gods and heroes, the nature of the world and their own cult and ritual practices. ... The provisional designation of comets and asteroids are similar to each other: they both follow a pattern set in 1925 by the Minor Planet Center of the IAU. Historical designations At first, astronomers strove to assign symbols to the minor planets: 1 Ceres a stylized sickle 2 Pallas a lozenge...

Contents

Physical characteristics

Ixion is moderately red (slightly redder than 50000 Quaoar) and it has a higher albedo (0.15) than the mid-sized red cubewanos. 50000 Quaoar (pronounced kwaa·waar or kwow·ər, English IPA: , Tongva ) [2] is a Trans-Neptunian object orbiting the Sun in the Kuiper belt. ... Albedo is the ratio of reflected to incident electromagnetic radiation power. ... A cubewano is any substantial Kuiper belt object, orbiting beyond about 41 AU and not controlled by resonances with the outer planets. ...


The latest spectroscopic results indicate that Ixion's surface is a mixture of dark carbon and tholin, which is a heteropolymer formed by irradiation of clathrates of water and organic compounds (see TNO spectra). Water ice absobtion lines (1.5 and 2μm) were absent (Licandro et al. 2002). Unlike Varuna, Ixion does not show greater reflectivity for longer waves (the so-called red slope) in infrared. A spectroscope is a device which measures the spectrum of light. ... General Name, Symbol, Number carbon, C, 6 Chemical series nonmetals Group, Period, Block 14, 2, p Appearance black (graphite) colorless (diamond) Standard atomic weight 12. ... Tholin is a heteropolymer formed by solar ultraviolet irradiation of simple organic compounds such as methane or ethane. ... A heteropolymer, also called a copolymer, is a polymer formed when two (or more) different types of monomer are linked in the same polymer chain, as opposed to a homopolymer where only one monomer is used. ... A clathrate or clathrate compound is a chemical substance consisting of a Greek klethra, meaning bars (in the sense of a lattice). ... Impact from a water drop causes an upward rebound jet surrounded by circular capillary waves. ... Benzene is the simplest of the arenes, a family of organic compounds An organic compound is any member of a large class of chemical compounds whose molecules contain carbon and hydrogen; therefore, carbides, carbonates, carbon oxides and elementary carbon are not organic (see below for more on the definition controversy... A trans-Neptunian object (TNO) is any object in the solar system that orbits the sun at a greater distance on average than Neptune. ... In optics, reflectivity is the reflectance (the ratio of reflected power to incident power, generally expressed in decibels or percentage) at the surface of a material so thick that the reflectance does not change with increasing thickness; , the intrinsic reflectance of the surface, irrespective of other parameters such as the... The wavelength is the distance between repeating units of a wave pattern. ... In astrophysics and planetary science, spectral slope is a measure of dependence of the reflectance on the wavelength. ... Image of two girls in mid-infrared (thermal) light (false-color) Infrared (IR) radiation is electromagnetic radiation of a wavelength longer than that of visible light, but shorter than that of radio waves. ...


Orbit

This diagram shows the orbits of Ixion (green), Pluto (red) and Neptune (grey). The current positions of Ixion and Pluto are indicated (as of April 2006).
This diagram shows the orbits of Ixion (green), Pluto (red) and Neptune (grey). The current positions of Ixion and Pluto are indicated (as of April 2006).


Ixion and Pluto follow similar but differently oriented orbits: Ixion’s perihelion is below the ecliptic whereas Pluto's is above it. Uncharacteristically for bodies locked in resonance with Neptune (such as Orcus), Ixion approaches Pluto with less than 20 degrees of angular separation. Ixion is currently crossing the ecliptic heading below, and will reach its perihelion in 2070. Pluto has passed its perihelion (1989) and is descending toward the ecliptic. Ixion's orbital period is almost 250 Earth years, about 0.5% larger than Pluto's. Image File history File links This is a lossless scalable vector image. ... Image File history File links This is a lossless scalable vector image. ... This article is about several astronomical terms (apogee & perigee, aphelion & perihelion, generic equivalents based on apsis, and related but rarer terms. ... The plane of the ecliptic is well seen in this picture from the 1994 lunar prospecting Clementine spacecraft. ... 90482 Orcus (originally known by the provisional designation 2004 DW) is a Kuiper Belt object (KBO) that was discovered by Michael Brown of Caltech, Chad Trujillo of the Gemini Observatory, and David Rabinowitz of Yale University. ... In mathematics (in particular geometry and trigonometry) and all natural sciences (including astronomy, geophysics, etc), the angular distance (or angular separation) between two point objects, as observed from a location different from either of these objects, is the size of the angle between the two directions originating from the observer... (Redirected from 2070) (20th century - 21st century - 22nd century - other centuries) Definition In calendars based on the Christian Era or Common Era, such as the Gregorian calendar, the 21st century is the current century, as of this writing, lasting from 2000-2099. ... 1989 (MCMLXXXIX) was a common year starting on Sunday of the Gregorian calendar. ...


See also

  • Comparison of colours of trans-Neptunian objects

A trans-Neptunian object (TNO) is any object in the solar system that orbits the sun at a greater distance on average than Neptune. ...

References

  • H. Boehnhardt, S. Bagnulo, K. Muinonen, M. A. Barucci, L. Kolokolova, E. Dotto and G. P. Tozzi (2003). "Surface characterization of 28978 Ixion (2001 KX76)". Astronomy & Astrophysics 415: L17-L19.  Pre-print about Ixion's surface from the Planetary Systems Research group of the University of Helsinki
  • J. Licandro, F. Ghinassi, L. Testi (2002). "Infrared spectroscopy of the largest known trans-neptunian object 2001 KX76". Astronomy & Astrophysics.  Pre-print on arXiv
  • W. J. Altenhoff, F. Bertoldi and K. M. Menten (2004). "Size estimates of some optically bright KBOs". Astronomy & Astrophysics 415. 

University of Helsinki is not to be confused with Helsinki University of Technology. ...

External links

  • AstDys orbital elements
  • Orbit simulation from JPL (Java).
Minor planets
Previous minor planet 28978 Ixion Next minor planet
List of asteroids

  Results from FactBites:
 
Wikipedia: Ixion (282 words)
In Greek mythology, Ixion was one of the Lapiths, a king of Thessaly, and a son of Phlegyas.
Ixion was expelled from Olympus, and Zeus struck him with a thunderbolt.
The story of Ixion is told by Diodorrus, Pindar, Virgil in Georgics 4 and Aeneid 6, and by Ovid in Metamorphoses 12.
BIGpedia - 28978 Ixion - Encyclopedia and Dictionary Online (142 words)
28978 Ixion (ik-sye'-un; Latin Ixīōn, Greek Ιξίων) is a Kuiper belt object discovered on May 22 2001 with a diameter of < 822 km and a semimajor axis of about 39.5 AU.
Ixion is a Plutino, meaning it has a 3:2 orbital resonance with Neptune.
The latest spectroscopy results indicate that it has a surface that is a mixture of dark carbon and tholin, which is a heteropolymer formed by irradiation of clathrates of water and organic compounds (such as methane or ethane).
  More results at FactBites »

 
 

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