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Encyclopedia > Charon (moon)
Charon
Charon's Pluto-facing hemisphere (determined from brightness variations during Pluto-Charon occultations)
Discovery
Discovered by James W. Christy
Discovery date June 22, 1978
Epoch 2,452,600.5
Semi-major axis 19,571 ± 4 km
Eccentricity 0.00000 ± 0.00007
Orbital period 6.3872304 ± 0.0000011 d
(6 d 9 h 17 m 36.7 ± 0.1 s)
Inclination
(to Pluto's equator)
119.591 ± 0.014°
(to Pluto's orbit)
112.783 ± 0.014°
(to the ecliptic)
Longitude of ascending node 223.046 ± 0.014°
(to vernal equinox)
Satellite of Pluto
Physical characteristics
Mean radius 603.5 ± 1.5 km[2]
(0.095 Earths)
Surface area 4.58×106 km²
Mass (1.52 ± 0.06)×1021 kg[1]
(2.54×10−4 Earths)
(11.6% of Pluto)
Mean density 1.65 ± 0.06 g/cm³[1]
Equatorial surface gravity 0.278 m/s2
Escape velocity 0.580 km/s
.36 mi/s
Rotation period synchronous
Axial tilt zero?
Albedo varies between 0.36 and 0.39
Temperature -220°C (53 K)
Apparent magnitude 16.8[3]
Absolute magnitude 1[4]
Angular diameter 55 milli-arcsec[5]
Adjectives Charonian

Charon (pronounced /ˈʃɛərən/ SHAIR-ən, or /ˈkɛərən/ KAIR-ən as in Greek: Χάρων), discovered in 1978, is either the largest moon of Pluto or one member of a double dwarf planet with Pluto being the other member, depending on the definition employed. With the discovery in 2005 of two other moons of Pluto (Nix and Hydra), Charon is now also referred to as Pluto I. The New Horizons mission is scheduled to visit Charon and Pluto in July 2015. Image File history File links No higher resolution available. ... James Walter Christy (born 1938) is an American astronomer. ... is the 173rd day of the year (174th in leap years) in the Gregorian calendar. ... Year 1978 (MCMLXXVIII) was a common year starting on Sunday (link displays the 1978 Gregorian calendar). ... Two bodies with a slight difference in mass orbiting around a common barycenter. ... In astronomy, an epoch is a moment in time for which celestial coordinates or orbital elements are specified. ... 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. ... 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 χίλια (khilia) = thousand and μέτρο (metro) = count/measure). ... (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. ... For the science fiction novella by William Shunn, see Inclination (novella). ... The plane of the ecliptic is well seen in this picture from the 1994 lunar prospecting Clementine spacecraft. ... 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. ... Illumination of Earth by Sun on the day of equinox The vernal equinox (or spring equinox) marks the beginning of astronomical spring. ... A natural satellite or moon is a celestial body that orbits a planet or smaller body, which is called the primary. ... For other uses, see Pluto (disambiguation). ... In mathematics, a spheroid is a quadric surface in three dimensions obtained by rotating an ellipse about one of its principal axes. ... To help compare sizes of different areas, here is a list of areas between 10 million km² and 100 million km². See also areas of other orders of magnitude. ... Square kilometre (U.S. spelling: square kilometer), symbol km², is a decimal multiple of SI unit of surface area square metre, one of the SI derived units. ... For other uses, see Mass (disambiguation). ... Kg redirects here. ... For other uses, see Density (disambiguation). ... BIC pen cap, about 1 gram. ... A cubic centimetre (cm3) is an SI derived unit of volume, equal to the volume of a cube with side length of 1 centimetre. ... The surface gravity of a Killing horizon is the acceleration, as exerted at infinity, needed to keep an object at the horizon. ... Acceleration is the time rate of change of velocity and/or direction, and at any point on a velocity-time graph, it is given by the slope of the tangent to the curve at that point. ... For other senses of this term, see escape velocity (disambiguation). ... kilometre per second is an SI derived unit of both speed (scalar) and velocity (vector), signified by the symbol km/s or km s-1. ... In astronomy, a rotation period is the time an astronomical object takes to complete one revolution around its rotation axis relative to the background stars. ... Due to synchronous rotation of their moon, the inhabitants of the central body will never be able to see its green side. ... In astronomy, axial tilt is the inclination angle of a planets rotational axis in relation to a perpendicular to its orbital plane. ... For other uses, see Albedo (disambiguation). ... For other uses, see Temperature (disambiguation). ... For other uses, see Celsius (disambiguation). ... For other uses, see Kelvin (disambiguation). ... The apparent magnitude (m) of a star, planet or other celestial body is a measure of its apparent brightness as seen by an observer on Earth. ... 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. ... The angular diameter of an object as seen from a given position is the diameter measured as an angle. ... Year 1978 (MCMLXXVIII) was a common year starting on Sunday (link displays the 1978 Gregorian calendar). ... For other uses, see Pluto (disambiguation). ... Pluto and Charon are sometimes informally considered to be a double (dwarf) planet. ... Artists impression of Pluto (background) and Charon (foreground). ... Year 2005 (MMV) was a common year starting on Saturday (link displays full calendar) of the Gregorian calendar. ... Nix (formerly known as S/2005 P 2), is a natural satellite of Pluto. ... Hydra (formerly known as S/2005 P 1) is a natural satellite of Pluto. ... For other uses, see New Horizons (disambiguation). ...


Charon should not be confused with the similarly named Chiron, a smaller object in the outer solar system. 2060 Chiron (IPA: ) is an object in the outer solar system with an orbit between those of Saturn and Uranus and a radius of 71±5 km [1]. Although it was initially classified as an asteroid, later dispute arose as to whether it was an asteroid or actually a comet. ...

Contents

Discovery

Charon was discovered by astronomer James Christy on June 22, 1978, when he was examining highly magnified images of Pluto on photographic plates taken a couple of months before. Christy noticed that a slight bulge appeared periodically. Later, the bulge was confirmed on plates dating back to April 29, 1965. James Walter Christy (born 1938) is an American astronomer. ... is the 173rd day of the year (174th in leap years) in the Gregorian calendar. ... Year 1978 (MCMLXXVIII) was a common year starting on Sunday (link displays the 1978 Gregorian calendar). ... For other uses, see Pluto (disambiguation). ... Photographic plates were one of the earliest forms of photographic film, in which a light-sensitive emulsion of silver salts was applied to a glass plate. ... is the 119th day of the year (120th in leap years) in the Gregorian calendar. ... Year 1965 (MCMLXV) was a common year starting on Friday (link will display full calendar) of the 1965 Gregorian calendar. ...


Subsequent observations of Pluto determined that the bulge was due to a smaller accompanying body. The periodicity of the bulge corresponded to Pluto's rotation period, which was previously known from Pluto's light curve. This indicated a synchronous orbit, which strongly suggested that the bulge effect was real and not spurious. In astronomy, a light curve is a graph of light intensity as a function of time. ... A synchronous orbit is an orbit in which an orbiting body (usually a satellite) has a period equal to the average rotational period of the body being orbited (usually a planet), and in the same direction of rotation as that body. ...


Any final doubts were erased when Pluto and Charon entered a five-year period of mutual eclipses between 1985 and 1990. This occurs when the Pluto-Charon orbital plane is edge-on as seen from Earth, which only happens at two intervals in Pluto's 248-year orbital period. It was fortuitous that one of these intervals happened to occur so soon after Charon's discovery. The orbital plane of an object orbiting another is the geometrical plane in which the orbit is embedded. ...


Images showing Pluto and Charon resolved into separate disks were taken for the first time by the Hubble Space Telescope in the 1990s. Later, the development of adaptive optics made it possible to also resolve Pluto and Charon into separate disks using ground-based telescopes. The Hubble Space Telescope (HST; also known colloquially as the Hubble or just Hubble) is a space telescope that was carried into Earth orbit by the Space Shuttle in April 1990. ... A deformable mirror can be used to correct wavefront errors in an astronomical telescope. ...


Name

Charon was originally known by the temporary designation S/1978 P 1, according to the then recently instituted convention. On June 24, 1978, Christy first suggested the name Charon as a scientific-sounding version of his wife Charlene's nickname, "Char." Although colleagues at the Naval Observatory proposed Persephone, Christy stuck with Charon after discovering it coincidentally refers to a Greek mythological figure.[6] Official adoption of the name by the IAU would wait until late 1985, and was announced on 3 January 1986.[7] is the 175th day of the year (176th in leap years) in the Gregorian calendar. ... Year 1978 (MCMLXXVIII) was a common year starting on Sunday (link displays the 1978 Gregorian calendar). ... Aerial view of USNO. The United States Naval Observatory (USNO) is one of the oldest scientific agencies in the United States. ... This article is about the Greek goddess. ... IAU redirects here. ... This article is about the year. ... is the 3rd day of the year in the Gregorian calendar. ... Year 1986 (MCMLXXXVI) was a common year starting on Wednesday (link displays 1986 Gregorian calendar). ...


In Greek mythology, Charon is the ferryman of the dead, a figure with close ties to the god Hades, which the Romans identified with their god Pluto. Although in English the mythological figure Charon is pronounced with a hard k sound, Christy pronounced the ch in the moon's name as sh (IPA [ʃ]), after his wife Charlene. The sh pronunciation is customary among astronomers when speaking English.[citation needed] Speakers of languages other than English, which use the name Charon, follow the pronunciation established for the mythological figure. Michelangelos rendition of Charon. ...


Physical characteristics

Artist's concept of Charon seen from the surface of Pluto.

Charon's diameter is about 1,207 km (750 miles), just over half that of Pluto, with a surface area of 4,580,000 km². Unlike Pluto, which is covered with nitrogen and methane ices, the Charonian surface appears to be dominated by less volatile water ice, and also appears to have no atmosphere. In 2007, observations by the Gemini Observatory of patches of ammonia hydrates and water crystals on the surface of Charon suggested the presence of active cryo-geysers.[8] Image File history File links Charon_2. ... Image File history File links Charon_2. ... To help compare different orders of magnitude this page lists lengths between 106 and 107 m (1,000 and 10,000 km). ... “km” redirects here. ... To help compare orders of magnitude of different surface areas  here is a list of areas between 1 million km² and 10 million km². See also areas of other orders of magnitude. ... Square kilometre (U.S. spelling: square kilometer), symbol km², is a decimal multiple of SI unit of surface area square metre, one of the SI derived units. ... General Name, symbol, number nitrogen, N, 7 Chemical series nonmetals Group, period, block 15, 2, p Appearance colorless gas Standard atomic weight 14. ... Methane is a chemical compound with the molecular formula . ... Look up volatile in Wiktionary, the free dictionary. ... The Gemini Observatory is an astronomical observatory consisting of two 8-metre telescopes at different sites. ...


Mutual eclipses of Pluto and Charon in the 1980s allowed astronomers to take spectra of Pluto and then the combined spectrum of the pair. By subtracting Pluto's spectrum from the total, astronomers were able to spectroscopically determine the surface composition of Charon.


Charon's volume and mass allow us to calculate its density; from this we can tell Charon is largely an icy body and contains less rock by proportion than its partner Pluto, supporting the idea Charon was created by a giant impact into Pluto's icy mantle (see Formation below.) There are two conflicting theories about Charon's internal structure: some scientists believe it to be a differentiated body like Pluto with a rocky core and an icy mantle while others believe Charon to be of uniform composition throughout. Evidence in support of the former position was found in 2007, when observations by the Gemini Observatory of patches of ammonia hydrates and water crystals on the surface of Charon suggested the presence of active cryo-geysers. The fact that the ice was still in crystalline form suggested it had been recently deposited, as solar radiation would have degraded older ice to an amorphous state after 30,000 years or so.[8] The Gemini Observatory is an astronomical observatory consisting of two 8-metre telescopes at different sites. ...


Orbital characteristics

Surface of Pluto and Charon, as determined from brightness variations during mutual occultations.

Charon and Pluto revolve about each other every 6.387 days. The two objects are gravitationally locked, so each keeps the same face towards the other. The average distance between Charon and Pluto is 19,570 km (12,163 mi). The discovery of Charon allowed astronomers to accurately calculate the mass of the Plutonian system, and mutual occultations revealed their sizes. However, neither indicated the two bodies' individual masses, which could only be estimated, until the discovery of Pluto's outer moons in late 2005. Details in the orbits of the outer moons reveal that Charon has approximately 11.65% of the mass of Pluto.[1] This shows it to have a density of 1.65±0.06 g/cm³, suggesting a composition of 55±5% "rock" to 45% ice, whereas Pluto is somewhat denser and about 70% "rock". Image File history File links Plutoncharon1. ... Image File history File links Plutoncharon1. ... Tidal locking makes one side of an astronomical body always face another, like the Moon facing the Earth. ... In this July, 1997 still frame captured from video, the bright star Aldebaran has just reappeared on the dark limb of the waning crescent moon in this predawn occultation. ...


Formation

Simulation work published in 2005 by Robin Canup suggested that Charon could have formed by a giant impact around 4.5 billion years ago, much like the Earth and Moon. In this model a large Kuiper belt object struck Pluto at high velocity, destroying itself and blasting off much of Pluto's outer mantle, and Charon coalesced from the debris. However, such an impact should result in an icier Charon and rockier Pluto than what scientists have found. It is now thought that Pluto and Charon may have been two bodies that collided before going into orbit about each other. The collision would have been violent enough to boil off volatile ices like methane but not violent enough to have destroyed either body.[9] Year 2005 (MMV) was a common year starting on Saturday (link displays full calendar) of the Gregorian calendar. ... The Big Splash redirects here. ... One thousand million (1,000,000,000) is the natural number following 999,999,999 and preceding 1,000,000,001. ... This article is about Earth as a planet. ... This article is about Earths moon. ... The Kuiper belt, derived from data from the Minor Planet Center. ... Earth cutaway from core to exosphere. ...


Moon or dwarf planet?

Pluto and its three known moons.

The center of mass (barycenter) of the Pluto-Charon system lies outside either body. Since neither object truly rotates around the other, and Charon has 11.6% the mass of Pluto, it has been argued that Charon should not be considered to be a satellite of Pluto. Instead, it has been suggested that they form dual dwarf planets, following the re-classification of Pluto. Image File history File linksMetadata Download high-resolution version (1085x1095, 118 KB) File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Solar System Pluto User:Wahkeenah Plutos natural satellites Talk:Plutos natural satellites User:Appraiser User:JohnnyBGood... Image File history File linksMetadata Download high-resolution version (1085x1095, 118 KB) File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Solar System Pluto User:Wahkeenah Plutos natural satellites Talk:Plutos natural satellites User:Appraiser User:JohnnyBGood... The center of mass or center of inertia of an object is a point at which the objects mass can be assumed, for many purposes, to be concentrated. ...


In a draft proposal for the 2006 redefinition of the term, the International Astronomical Union proposed that a planet be defined as a body that orbits the sun that is large enough for gravitational forces to render the object (nearly) spherical. Under this proposal, Charon would have been classified as a planet, since the draft explicitly defined a planetary satellite as one in which the barycenter lies within the major body. In the final definition, Pluto was reclassified as a dwarf planet, but the formal definition of a planetary satellite was not decided upon, leaving Charon's status unclear. (Charon is not in the list of dwarf planets currently recognized by the IAU.) The final definition left the solar system with eight planets, pictured above (not to scale) Displays the remaining eight planets with the celestial bodies that have now been designated as dwarf planets. ... IAU redirects here. ... Artists impression of Pluto (background) and Charon (foreground). ...


The moons Nix and Hydra also orbit the same barycenter, but are not large enough to be spherical, and are simply considered to be satellites of Pluto (or, under the alternative viewpoint, of the Pluto-Charon system).[10] Nix (formerly known as S/2005 P 2), is a natural satellite of Pluto. ... Hydra (formerly known as S/2005 P 1) is a natural satellite of Pluto. ...


References

  1. ^ a b c d Marc W. Buie, William M. Grundy, Eliot F. Young, Leslie A. Young, S. Alan Stern (2006). "Orbits and photometry of Pluto's satellites: Charon, S/2005 P1, and S/2005 P2". Astronomical Journal 132: 290. doi:10.1086/504422. arΧiv:astro-ph/0512491. 
  2. ^ B. Sicardy et al (2006). "Charon’s size and an upper limit on its atmosphere from a stellar occultation". Nature 439: 52. doi:10.1038/nature04351. 
  3. ^ Classic Satellites of the Solar System. Observatorio ARVAL. Retrieved on 2007-10-19.
  4. ^ David Jewitt (2008 June). The 1000 km Scale KBOs. Institute for Astronomy (UH). Retrieved on 2008-06-13.
  5. ^ Stellar occultation allows VLT to determine Charon's size and to put upper limit on its atmosphere. ESO 02/06 - Science Release (2006-01-04). Retrieved on 2007-10-19.
  6. ^ Govert Shillling, "A Bump in the Night" in Sky & Telescope (June 2008) pp. 26-27. Prior to this, Christy had considered naming the moon Oz.
  7. ^ IAU Circular No. 4157 (January 3, 1986). Retrieved on 2007-04-10.
  8. ^ a b Charon: An ice machine in the ultimate deep freeze. Gemini Observatory (2007). Retrieved on 2007-07-18.
  9. ^ Schriber (2005). "Charon's Shadow Illuminates Its True Nature". ScienceNOW. 
  10. ^ Stern, Alan (2005-05-15). Background Information Regarding Our Two Newly Discovered Satellites of Pluto. Planetary Science Directorate (Boulder Office). Retrieved on 2006-08-30.

A digital object identifier (or DOI) is a standard for persistently identifying a piece of intellectual property on a digital network and associating it with related data, the metadata, in a structured extensible way. ... arXiv (pronounced archive, as if the X were the Greek letter χ) is an archive for electronic preprints of scientific papers in the fields of physics, mathematics, computer science and quantitative biology which can be accessed via the Internet. ... A digital object identifier (or DOI) is a standard for persistently identifying a piece of intellectual property on a digital network and associating it with related data, the metadata, in a structured extensible way. ... Year 2007 (MMVII) was a common year starting on Monday of the Gregorian calendar in the 21st century. ... is the 292nd day of the year (293rd in leap years) in the Gregorian calendar. ... 2008 (MMVIII) is the current year, a leap year that started on Tuesday of the Common Era (or Anno Domini), in accordance with the Gregorian calendar. ... is the 164th day of the year (165th in leap years) in the Gregorian calendar. ... Year 2006 (MMVI) was a common year starting on Sunday of the Gregorian calendar. ... is the 4th day of the year in the Gregorian calendar. ... Year 2007 (MMVII) was a common year starting on Monday of the Gregorian calendar in the 21st century. ... is the 292nd day of the year (293rd in leap years) in the Gregorian calendar. ... Sky & Telescope is a monthly magazine providing articles and information on all aspects of astronomy, space exploration, telescope equipment, and amateur telescope making and use. ... Oz is a fairy country (fantasy region) containing four lands under the rule of one monarch. ... is the 3rd day of the year in the Gregorian calendar. ... Year 1986 (MCMLXXXVI) was a common year starting on Wednesday (link displays 1986 Gregorian calendar). ... Year 2007 (MMVII) was a common year starting on Monday of the Gregorian calendar in the 21st century. ... is the 100th day of the year (101st in leap years) in the Gregorian calendar. ... Year 2007 (MMVII) was a common year starting on Monday of the Gregorian calendar in the 21st century. ... is the 199th day of the year (200th in leap years) in the Gregorian calendar. ... Year 2005 (MMV) was a common year starting on Saturday (link displays full calendar) of the Gregorian calendar. ... is the 135th day of the year (136th in leap years) in the Gregorian calendar. ... Year 2006 (MMVI) was a common year starting on Sunday of the Gregorian calendar. ... is the 242nd day of the year (243rd in leap years) in the Gregorian calendar. ...

External links

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Atmospheric pressure 0 kPa Proteus (proe-tee-us, Greek Πρωτέας) is one of Neptunes moons. ... Mimas (mee-mÉ™s or mye-mÉ™s, IPA: , Greek Μίμᾱς, rarely Μίμανς) is a moon of Saturn that was discovered in 1789 by William Herschel. ... In astronomy, an inner satellite is a natural satellite following a prograde, low inclination orbit inwards of the large satellites of the parent planet. ... A Trojan moon is a natural satellite of a planet occupying the L4 or L5 equilateral Lagrangian points of a primary-moon system. ... 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. ... This is a list of natural satellites in the solar system: Mercury: none Venus: none Earth: Moon Mars: Phobos Deimos Jupiter: see Jupiters natural satellites Saturn: see Saturns natural satellites Uranus: see Uranus natural satellites Neptune: see Neptunes natural satellites Pluto: Charon In addition, various asteroids are... This is a list of natural satellites in the solar system, ordered from largest to smallest by average diameter. ... The naming of natural satellites has been the responsibility of the IAUs committee for Planetary System Nomenclature since 1973. ... A trans-Neptunian object (TNO) is any object in the solar system that orbits the sun at a greater distance on average than Neptune. ... Pronunciation of Centaurs, Kuiper Belt Objects, and other planetoids of the outer solar system Pronunciation key ... In astronomy, a plutino is a trans-Neptunian object that has a 3:2 orbital resonance with Neptune. ... For other uses, see Pluto (disambiguation). ... 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(119951) 2002 KX14, also written as 2002 KX14, is a trans-Neptunian object (TNO) residing within the Kuiper belt. ... (also written (84719) 2002 VR128) is a trans-Neptunian object (TNO). ... is a trans-Neptunian object discovered by the Near Earth Asteroid Tracking program on November 14, 2003. ... 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. ... 1993 RO is a trans-Neptunian object of the Plutino class. ... 1993 RP is a trans-Neptunian object of the Plutino class. ... , also written as 2003 AZ84, is a Trans-Neptunian object. ... 2001 QF298, also written as 2001 QF298, is a trans-Neptunian object that resides in the Kuiper belt. ... A cubewano is any substantial Kuiper belt object, orbiting beyond about 41 AU and not controlled by resonances with the outer planets. ... (15760) 1992 QB1 (also written (15760) 1992 QB1) was the first trans-Neptunian object to be discovered after Pluto and Charon. ... (15807) 1994 GV9 is a trans-Neptunian object of the cubewano class. ... (16684) 1994 JQ1, also written as (16684) 1994 JQ1, is a trans-Neptunian object that resides in the Kuiper belt. ... (19255) 1994 VK8, also written as (19255) 1994 VK8, is a trans-Neptunian object (TNO) that resides in the Kuiper belt beyond Pluto. ... 1995 GJ with an inclination of 22. ... (24835) 1995 SM55, also written (24835) 1995 SM55, is a trans-Neptunian object (TNO) that resides in the Kuiper belt. ... (also written (19308) 1996 TO66) is a trans-Neptunian object. ... In the Gnostic tradition, Logos and Zoe are a paired emanation of the deity, and part of its creation myth. ... (79360) 1997 CS29, also written as 1997 CS29, is a cubewano. ... (33001) 1997 CU29, also written as (33001) 1997 CU29 is a cubewano. ... (24978) 1998 HJ151, also written as (24978) 1998 HJ151, is a cubewano. ... (85627) 1998 HP151, also written as (85627) 1998 HP151 is a cubewano. ... (52747) 1998 HM151, also written as (52747} 1998 HM151, is a cubewano. ... (85633) 1998 KR65, also written as (85633) 1998 KR65, is a cubewano. ... 19521 Chaos (1998 WH24) is a cubewano, a Kuiper belt object not in resonance with any planet. ... (69987) 1998 WA25, also written as (69987) 1998 WA25, is a cubewano. ... (79983) 1999 DF9, also written as (79983) 1999 DF9, is a cubewano. ... (118378) 1999 HT11, also written as (118378) 1999 HT11, is a cubewano. ... 53311 Deucalion (original provisional designation: 1999 HU11) is a trans-Neptunian object. ... 20000 Varuna (VAR oo na) is a large classical Kuiper Belt object (KBO). ... is a trans-Neptunian object (TNO). ... Quaoar redirects here. ... (55636) 2002 TX300 (Also written as (55636) 2002 TX300) is a large Trans-Neptunian object discovered in October 15, 2002 by the NEAT program. ... The correct title of this article is (55637) 2002 UX25. ... (also written (136108) 2003 EL61), nicknamed Easter Bunny, is a large Kuiper belt object, roughly one-third the mass of Pluto, discovered by J. L. Ortiz et al. ... (120178) 2003 OP32, also written as (120178) 2003 OP32,is a trans-Neptunian object (TNO) that resides in the Kuiper belt. ... (90568) 2004 GV9 (also written (90568) 2004 GV9) is a trans-Neptunian object. ... (also written (136472) 2005 FY9) is a very large Kuiper belt object, and one of the two largest among the population in the classical KBO orbits. ... (145452) 2005 RN43, also written as (145452) 2005 RN43, is a large trans-Neptunian object (TNO) orbiting beyond Pluto in the Kuiper belt. ... 88611 Teharonhiawako (de-ha-loon-hee-a-wa-go, Mohawk approximately IPA: ), provisionally , is a trans-Neptunian object and a member of the Kuiper belt. ... 1998 WW31 (also written 1998 WW31) is an object of the solar system located beyond the orbit of Neptune. ... is a Trans-Neptunian object (TNO). ... 2003 MW12, also written 2003 MW12, is a trans-Neptunian object that is in the Kuiper belt. ... 2003 QW90, also written as 2003 QW90, is a trans-Neptunian object (TNO) that resides in the Kuiper belt. ... While a Plutino completes 2 orbits around the Sun in the time it takes Neptune to complete 3 orbits, a Twotino makes 1 orbit around the Sun in the time it takes Neptune to complete 2 orbits. ... 1996 TR66, also written as 1996 TR66, is a Trans-Neptunian object orbiting beyond Pluto in the Kuiper belt. ... (26308) 1998 SM165, also written as (26308) 1998 SM165, is a trans-Neptunian object (TNO) that resides in the Kuiper belt. ... (137295) 1999 RB216, also written as 1999 RB216, is a trans-Neptunian object that resides in the Kuiper belt. ... (130391) 2000 JG81, also written as 2000 JG81, is a trans-Neptunian object that resides in the Kuiper belt. ... 2002 WC19, also written as 2002 WC19, is a Trans-Neptunian object orbiting beyond Pluto. ... 1997 SZ10, also written as 1997 SZ10, is a trans-Neptunian object that resides in the Kuiper belt. ... In astronomy, a resonant Trans-Neptunian Object is a Trans-Neptunian Object (TNO) in mean motion orbital resonance with Neptune. ... (15809) 1998 JS is a trans-Neptunian object that resides in the Kuiper belt beyond Pluto. ... (15836) 1995 DA2, also written as (15836) 1995 DA2, is a trans-Neptunian object. ... (69988) 1998 WA31, also written as (69988) 1998 WA31, is a Trans-Neptunian object that resides in the scattered disc region beyond the Kuiper belt. ... (79969) 1999 CP133, also written as (79969) 1999 CP133, is a trans-Neptunian object. ... (26375) 1999 DE9 (also written (26375) 1999 DE9) is an object of the solar system located beyond the orbit of Neptune. ... (38084) 1999 HB12, also written as (38084) 1999 HB12, is a trans-Neptunian object that resides in the scattered disc region of the Solar System. ... (119068) 2001 KC77, also written as (119068) 2001 KC77, is a trans-Neptunian object (TNO) that resides in the scattered disc region of the Solar System. ... (119070) 2001 KP77 (better known as 2001 KP77) is a 4:7 resonant Trans-Neptunian object (TNO) located in the kuiper belt. ... (84522) 2002TC302 is a large Scattered Disk Object (SDO), orbiting the sun at a distance of 39. ... (136120) 2003 LG7, also written as 2003 LG7, is a trans-Neptunian object that resides in the Kuiper belt. ... Eris, the largest known scattered disc object (center), and its moon Dysnomia (left of center). ... Absolute magnitude: −1. ... (48639) 1995 TL8 (also written (48639) 1995 TL8) is a trans-Neptunian object of the Scattered disk object subclass, and posesses a very large satellite. ... (26181) 1996 GQ21, also written as (26181) 1996 GQ21, is a trans-Neptunian object that resides in the scattered disc region of the Solar System. ... (15874) 1996 TL66 is a trans-Neptunian object that resides in the Kuyper belt. ... (79978) 1999 CC158, also written as (79978) 1999 CC158, is a trans-Neptunian object that resides in the scattered disc region of the Solar System. ... (60608) 2000 EE173, also written as (60608) 2000 EE173, is a Trans-Neptunian object discovered in 2000 by N. Wyn Evans, Jane X. Luu and Chadwick A. Trujillo. ... 2000 OO67 is a Trans Neptunian Object notable for its highly eccentric orbit. ... (118702) 2000 OM67, also written as (118702) 2000 OM67, is a trans-Neptunian object (TNO) that resides in the scattered disc region of the Solar System. ... (42301) 2001 UR163, also written as (42301) 2001 UR163, is a trans-Neptunian object (TNO) that resides in the extended Scattered disc. ... (119878) 2002 CY224, also written as (119878) 2002 CY224, is a trans-Neptunian object (TNO) that resides in the scattered disc region of the Solar System. ... (95625) 2002 GX32, also written as (95625) 2002 GX32, is a trans-Neptunian object that resides in the scattered disc region of the Solar System. ... (65407) 2002 RP120 holds the dubious distinction of being the most eccentric of the numbered asteroids (as of July 2004). ... you are abunch of bull | bgcolour=#FFFFC0 | name=90377 Sedna | image= | caption= Sedna is located in the center of the green circle | discovery=yes | discoverer=M. Brown, C. Trujillo, D. Rabinowitz | discovered=November 14, 2003 | mp_name=90377 Sedna | alt_names= | mp_category=Trans-Neptunian object | epoch=September 26, 1990 (JD 2448160. ... (145451) 2005 RM43, also written as (145451) 2005 RM43, is a trans-Neptunian object that resides in the scattered disc region beyond the Kuiper belt. ... , also written as (148209) 2000 CR105, is the fourth most distant known object in the solar system after Eris, and Sedna. ... (also written 2004 XR190) is a trans-Neptunian object located in the scattered disc. ... 2005 TN74 (also written 2005 TN74) is a possible Trojan asteroid of Neptune which was discovered by Scott S. Sheppard and Chadwick A. Trujillo in 2005. ... 2006 QH181, also written as 2006 QH181, is a trans-Neptunian object. ... (15883) 1997 CR29, also written as (15883) 1997 CR29, is a trans-Neptunian object. ... (35671) 1998 SN165, also written as (35671) 1998 SN165, is a trans-Neptunian object. ... (59358) 1999 CL158, also written as (59358) 1999 CL158, is a trans-Neptunian object that resides in the Kuiper belt. ... (118379) 1999 HC12, also written as (118379) 1999 HC12, is a trans-Neptunian object. ... (40314) 1999 KR16, also written as (40314) 1999 KR16, is a trans-Neptunian object. ... (86047) 1999 OY3, also written as (86047) 1999 OY3, is a trans-Neptunian object that resides in the Kuiper belt beyond Pluto. ... (120132) 2003 FY128, also written as (120132) 2003 FY128, is a trans-Neptunian object. ... (120347) 2004 SB60, also written as (120347) 2004 SB60, is a trans-Neptunian object that resides in the Kuiper belt. ... (120348) 2004 TY364, also written as (120348) 2004 TY364, is a trans-Neptunian object that resides in the Kuiper belt. ... (145453) 2005 RR43, also written as (145453) 2005 RR43, is a trans-Neptunian object (TNO). ... A natural satellite or moon is a celestial body that orbits a planet or smaller body, which is called the primary. ... Hydra (formerly known as S/2005 P 1) is a natural satellite of Pluto. ... Nix (formerly known as S/2005 P 2), is a natural satellite of Pluto. ... Dysnomia (officially designated (136199) Eris I Dysnomia) is a moon of the dwarf planet Eris. ... 1998 WW31 (also written 1998 WW31) is an object of the solar system located beyond the orbit of Neptune. ... 2003 EL61 (also written 2003 EL61), is a large and very unusual Kuiper belt object discovered by Mike Brown at Caltech in the United States. ... 2003 EL61 (also written 2003 EL61), is a large and very unusual Kuiper belt object discovered by Mike Brown at Caltech in the United States. ... 58534 Logos, formerly known as (58534) 1997 CQ29, is a Kuiper belt object, more specifically a cubewano. ... (79360) 1997 CS29, also written as (79360) 1997 CS29, is a cubewano. ... (88611) Teharonhiawako I Sawiskera, or simply Sawiskera (za-wee-ske-la, Mohawk approximately IPA: ), is the moon of KBO 88611 Teharonhiawako, and about 2/3 the size of that body. ... Artists impression of Pluto (background) and Charon (foreground). ... Eris, the largest known scattered disc object (center), and its moon Dysnomia (left of center). ... Artists rendering of the Oort cloud and the Kuiper Belt. ... A trans-Neptunian object (TNO) is any object in the solar system that orbits the sun at a greater distance on average than Neptune. ... Artists impression of Pluto (background) and Charon (foreground). ... The Kuiper belt, derived from data from the Minor Planet Center. ... 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. ... , also written as 2003 AZ84, is a Trans-Neptunian object. ... 28978 Ixion (IPA pronunciation: , Wiktionary:Ixion) is a Kuiper belt object discovered on May 22, 2001. ... For other uses, see Pluto (disambiguation). ... (145452) 2005 RN43, also written as (145452) 2005 RN43, is a large trans-Neptunian object (TNO) orbiting beyond Pluto in the Kuiper belt. ... is a Trans-Neptunian object (TNO). ... The correct title of this article is (55637) 2002 UX25. ... 20000 Varuna (VAR oo na) is a large classical Kuiper Belt object (KBO). ... (also written (136108) 2003 EL61), nicknamed Easter Bunny, is a large Kuiper belt object, roughly one-third the mass of Pluto, discovered by J. L. Ortiz et al. ... (55636) 2002 TX300 (Also written as (55636) 2002 TX300) is a large Trans-Neptunian object discovered in October 15, 2002 by the NEAT program. ... Quaoar redirects here. ... (also written (136472) 2005 FY9) is a very large Kuiper belt object, and one of the two largest among the population in the classical KBO orbits. ... is a trans-Neptunian object (TNO). ... Eris, the largest known scattered disc object (center), and its moon Dysnomia (left of center). ... (84522) 2002TC302 is a large Scattered Disk Object (SDO), orbiting the sun at a distance of 39. ... 2006 QH181, also written as 2006 QH181, is a trans-Neptunian object. ... Absolute magnitude: −1. ... you are abunch of bull | bgcolour=#FFFFC0 | name=90377 Sedna | image= | caption= Sedna is located in the center of the green circle | discovery=yes | discoverer=M. Brown, C. Trujillo, D. Rabinowitz | discovered=November 14, 2003 | mp_name=90377 Sedna | alt_names= | mp_category=Trans-Neptunian object | epoch=September 26, 1990 (JD 2448160. ... Triton (trye-tÉ™n, IPA: , Greek Τρίτων), or Neptune I, is the planet Neptunes largest moon. ... This is a partial list of numbered trans-Neptunian objects (TNOs), in order of discovery date. ... Below is a list of solar system objects with diameter >500km: The Sun, a spectral class G2 star Mercury Venus Earth Moon Mars Jupiter Io Europa Ganymede Callisto complete list of Jupiters natural satellites Saturn Tethys Dione Rhea Titan Iapetus complete list of Saturns natural satellites Uranus Ariel... This article is about the Solar System. ... It has been suggested that Planetary-size comparison be merged into this article or section. ... This is a list of solar system objects by mass, in decreasing order. ... Pronunciation of Centaurs, Kuiper Belt Objects, and other planetoids of the outer solar system Pronunciation key ... This article is about the Solar System. ... Sol redirects here. ... This article is about the planet. ... This article is about the planet. ... This article is about Earth as a planet. ... This article is about the planet. ... Spectral type: G[8] Absolute magnitude: 3. ... For other uses, see Jupiter (disambiguation). ... This article is about the planet. ... For other uses, see Uranus (disambiguation). ... For other uses, see Neptune (disambiguation). ... For other uses, see Pluto (disambiguation). ... Absolute magnitude: −1. ... This article is about the astronomical term. ... Artists impression of Pluto (background) and Charon (foreground). ... A natural satellite or moon is a celestial body that orbits a planet or smaller body, which is called the primary. ... This article is about Earths moon. ... The relative sizes of and distance between Mars, Phobos, and Deimos, to scale : Phobos (top) and Deimos (bottom). ... Jupiters 4 Galilean moons, in a composite image comparing their sizes and the size of Jupiter (Great Red Spot visible). ... The Saturnian system (photographic montage) Moons of Saturn (photographic montage) Saturn has 60 confirmed natural satellites, plus three hypothetical moons. ... Uranus has twenty-seven known moons. ... Neptune (top) and Triton (bottom), 3 days after the Voyager 2 flyby. ... Hubble image of the Plutonian system Pluto has three known moons. ... Dysnomia (officially designated (136199) Eris I Dysnomia) is a moon of the dwarf planet Eris. ... A Small Solar System Body (SSSB) is a term defined in 2006 by the International Astronomical Union to describe objects in the Solar System that are neither planets nor dwarf planets: [1] This encompasses: all minor planets apart from the dwarf planets, : the classical asteroids, (except for 1 Ceres, the... Meteor redirects here. ... For other uses, see Asteroid (disambiguation). ... 243 Ida and its moon Dactyl An asteroid moon is an asteroid that orbits another asteroid. ... For other uses, see Asteroid (disambiguation). ... The centaurs are a class of icy planetoids that orbit the Sun between Jupiter and Neptune, named after the mythical race of centaurs. ... A trans-Neptunian object (TNO) is any object in the solar system that orbits the sun at a greater distance on average than Neptune. ... The Kuiper belt, derived from data from the Minor Planet Center. ... Eris, the largest known scattered disc object (center), and its moon Dysnomia (left of center). ... Comet Hale-Bopp Comet West For other uses, see Comet (disambiguation). ... Artists rendering of the Oort cloud and the Kuiper Belt. ... Astronomical objects are significant physical entities, associations or structures which current science has confirmed to exist in space. ... Below is a list of solar system objects with diameter >500km: The Sun, a spectral class G2 star Mercury Venus Earth Moon Mars Jupiter Io Europa Ganymede Callisto complete list of Jupiters natural satellites Saturn Tethys Dione Rhea Titan Iapetus complete list of Saturns natural satellites Uranus Ariel... It has been suggested that Planetary-size comparison be merged into this article or section. ... This is a list of solar system objects by mass, in decreasing order. ...

  Results from FactBites:
 
Charon (713 words)
During the 1980's, Earth crossed the orbital plane of Charon and a series of mutual events were observed that significantly enhanced the study of the Pluto-Charon system.
It was fortunate that Charon's discovery was made prior to the mutual events, considering that the sun crosses the orbital plane of Charon only twice during a single Plutonian year.
It is thought possible that Charon, Neptunes' moon Triton, and Pluto are icy worlds of the outer solar system that were not swept up by Uranus and Neptune or ejected from the solar system.
Charon - Wikipedia, the free encyclopedia (268 words)
In Greek mythology, Charon (Greek Χάρων, fierce brightness) was the ferryman of Hades.
Corpses in ancient Greece were always buried with a coin underneath their tongue to pay Charon.
Charon was the son of Erebus and Nyx.
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