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Encyclopedia > Charon (planet)
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Charon

Artist's concept of Charon seen from the surface of Pluto.
Discovery
Discovered by James W. Christy
Discovered on June 22, 1978
Space Missions New Horizons flyby mission
to Pluto and Charon
Orbital characteristics [1]
Semimajor axis 19,571 ± 4 km
Eccentricity 0.00000 ± 0.00007
Orbital period 6.387230 ± 0.000001 d
(6 d 9 h 17 m 36.7 s ± 0.1 s)
Inclination 112.78±0.02° (to the ecliptic)
0.00°±0.014° (to Pluto's equator)
119.59±0.02° (to Pluto's orbit)
Is a satellite of Pluto
Physical characteristics
Mean diameter 1207 km ± 3 km [2]
(0.095 Earths)
Mass (1.52±0.06)×1021 kg [1]
(2.54×10−4 Earths)
Mean density 1.65 ± 0.06 g/cm3
Surface gravity 0.278 m/s2
Escape velocity 0.580 km/s
Surface Temperature -220 degrees Celsius (53 K)
Rotation period synchronous
Axial tilt zero
Albedo varies 0.36 to 0.39
Atmosphere none (< 0.11 μbar or 11 mPa)

Charon (shair'-ən or kair'-ən (key), IPA /ˈʃɛərən, ˈkɛərən/, Greek Χάρων) is the largest moon of Pluto, discovered in 1978. With the discovery in 2005 of two other moons of Pluto (Nix and Hydra), Charon is now also referred to as Pluto I. Wikipedia does not have an article with this exact name. ... 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. ... James Walter Christy (born 1938) is an American astronomer. ... June 22 is the 173rd day of the year (174th in leap years) in the Gregorian Calendar, with 192 days remaining. ... 1978 (MCMLXXVIII) was a common year starting on Sunday (the link is to a full 1978 calendar). ... New Horizons is a NASA unmanned mission to fly by Pluto and its moons. ... In physics, an orbit is the path that an object makes, around another object, whilst under the influence of a source of centripetal force, such as gravity. ... In geometry, the semi-major axis (also semimajor axis) a applies to ellipses and hyperbolas. ... 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). ... In astrodynamics, under standard assumptions any orbit must be of conic section shape. ... The orbital period is the time it takes a planet (or another object) to make one full orbit. ... Inclination in general is the angle between a reference plane and another plane or axis of direction. ... The plane of the ecliptic is well seen in this picture from the 1994 lunar prospecting Clementine spacecraft. ... Moons of solar system scaled to Earths Moon A natural satellite is a moon (not capitalized), that is, any natural object that orbits a planet. ... Atmospheric characteristics Atmospheric pressure 0. ... Diameter is an AAA (authentication, authorization and accounting) protocol for applications such as network access or IP mobility. ... Mass is a property of a physical object that quantifies the amount of matter and energy it is equivalent to. ... The international prototype, made of platinum-iridium, which is kept at the BIPM under conditions specified by the 1st CGPM in 1889. ... Density (symbol: ρ - Greek: rho) is a measure of mass per unit of volume. ... Gravity is a force of attraction that acts between bodies that have mass. ... Acceleration is the time rate of change of velocity, and at any point on a v-t graph, it is given by the slope of the tangent to that point In physics or physical science, acceleration (symbol: a) is defined as the rate of change (or derivative with respect to... In physics, for a given gravitational field and a given position, the escape velocity is the minimum speed an object without propulsion, at that position, needs to have to move away indefinitely from the source of the field, as opposed to falling back or staying in an orbit within a... 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. ... Temperature is also the name of a song by Sean Paul. ... On a prograde planet like the Earth, the sidereal day is shorter than the solar day. ... In astronomy, synchronous rotation is a planetological term describing a body orbiting another, where the orbiting body takes as long to rotate on its axis as it does to make one orbit; and therefore always keeps the same hemisphere pointed at the body it is orbiting. ... Axial tilt is an astronomical term regarding the inclination angle of a planets rotational axis in relation to its orbital plane. ... Albedo is the measure of reflectivity of a surface or body. ... Atmosphere is the general name for a layer of gases that may surround a material body of sufficient mass. ... IPA may refer to: The International Phonetic Alphabet or India Pale Ale ... Moons of solar system scaled to Earths Moon A natural satellite is a moon (not capitalized), that is, any natural object that orbits a planet. ... Atmospheric characteristics Atmospheric pressure 0. ... 1978 (MCMLXXVIII) was a common year starting on Sunday (the link is to a full 1978 calendar). ... 2005 (MMV) was a common year starting on Saturday 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. ...


Charon and Pluto are to be visited by the New Horizons mission in July 2015. New Horizons is a NASA unmanned mission to fly by Pluto and its moons. ...


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. ... June 22 is the 173rd day of the year (174th in leap years) in the Gregorian Calendar, with 192 days remaining. ... 1978 (MCMLXXVIII) was a common year starting on Sunday (the link is to a full 1978 calendar). ... Adjective Plutonian Atmospheric characteristics Atmospheric pressure 0. ... 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. ... April 29 is the 119th day of the year in the Gregorian calendar (120th in leap years). ... 1965 (MCMLXV) was a common year starting on Friday (the link is to a full 1965 calendar). ...


Name

Charon was originally known by the temporary designation S/1978 P 1, according to the then-recently instituted convention. Subsequently, Christy chose the name "Charon", which was officially accepted by the IAU in 1985. In Greek mythology, Charon was the ferryman of the dead, a figure with close ties to the god Hades (adopted by the Romans as Pluto). Logo of the IAU The International Astronomical Union (French: Union astronomique internationale) unites national astronomical societies from around the world. ... This article is about the year. ... In Greek mythology, Charon (Greek Χάρων, fierce brightness) was the ferryman of Hades. ...


Although the traditional English pronunciation of the mythological figure is with a hard k sound, Christy pronounced the ch in the moon's name as an sh sound (IPA [ʃ]), after his wife Charlene (nicknamed "Char"). The sh pronunciation is now common among astronomers, in spite of the pleas to follow customary usage. In European languages other than English, speakers generally follow the pronunciation established for the mythological figure.


Physical characteristics

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. 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 (US spelling: Square kilometer), symbol km², is an SI unit of surface area. ... General Name, Symbol, Number nitrogen, N, 7 Chemical series nonmetals Group, Period, Block 15, 2, p Appearance colorless Atomic mass 14. ... The simplest hydrocarbon, methane, is a gas with a chemical formula of CH4. ...


Orbital characteristics

Surface of Pluto and Charon, as determined from brightness variations during mutual occultations.
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". Pluton & charon Used in Polisch edition File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Pluton & charon Used in Polisch edition File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... 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 we find. 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 be disrupted.[3] 2005 (MMV) was a common year starting on Saturday of the Gregorian calendar. ... The Big Splash. ... The word billion and its equivalents in other languages refer to either one million million or one thousand million, depending on whether the writer is using the long scale or the short scale. ... Earth (often referred to as the Earth) is the third planet in the solar system in terms of distance from the Sun, and the fifth in order of size. ... Bulk composition of the moons mantle and crust estimated, weight percent Oxygen 42. ... Artists rendering of the Kuiper Belt and hypothetical more distant Oort cloud. ... Earth cutaway from core to exosphere. ...


The 2006 "moon or planet?" controversy

Charon had been a part of the controversy over the definition of a planet. Under the draft proposal by the International Astronomical Union, Charon could have potentially been classified as a planet rather than a moon. That (draft) classification may seem counter-intuitive, since a moon is an object that orbits a planet, just as Charon apparently orbits Pluto. However, Charon does not in fact simply orbit Pluto: instead, Pluto and Charon orbit each other around a center of mass that is outside both bodies. See barycenter for an explanation of the Pluto-Charon center of mass lying outside the surface of either object. Although planets are the principal component of the solar system other than the Sun, a precise definition of the term is surprisingly elusive. ... 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. ... Logo of the IAU The International Astronomical Union (French: Union astronomique internationale) unites national astronomical societies from around the world. ... Displays the remaining eight planets with the three new dwarf planets. ... Something is counter-intuitive if it does not seem likely to be true using the tool of human intuition or gut-feeling to perceive reality. ... In physics, the center of mass (or centre of mass) of a system of particles is a specific point at which, for many purposes, the systems mass behaves as if it were concentrated. ... 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. ...


The final definition of August 24, 2006 explicitly excluded satellites from the category of dwarf planets.[4] The IAU has not stated whether they currently consider Charon a satellite of Pluto or not. At least one IAU publication defines a "satellite" as orbiting a barycenter located inside of its primary [2], which would exclude Charon, but that document is of undetermined applicability. August 24 is the 236th day of the year in the Gregorian Calendar (237th in leap years), with 129 days remaining. ... 2006 (MMVI) is a common year starting on Sunday of the Gregorian calendar. ... It has been suggested that Table of dwarf planets in the solar system be merged into this article or section. ...


References

  1. ^ a b 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.(http://arxiv.org/abs/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.
  3. ^ Schriber (2005). "Charon's Shadow Illuminates Its True Nature". ScienceNOW.
  4. ^ Final draft, IAU press release 24 August 2006

External links

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  The Solar System  v·d·e 
Image:Eight Planets.png
Star: The Sun
Planets: Mercury - Venus - Earth - Mars - Jupiter - Saturn - Uranus - Neptune
Dwarf planets: Ceres - Pluto - 2003 UB313
Other: Moon - Asteroid belt - Comets - Kuiper belt - Scattered disc - Oort cloud
See also astronomical objects and the solar system's list of objects, sorted by radius or mass.


Image File history File links Commons-logo. ... Wikimedia Commons logo by Reid Beels The Wikimedia Commons (also called Commons or Wikicommons) is a repository of free content images, sound and other multimedia files. ... James Walter Christy (born 1938) is an American astronomer. ... Robert Sutton Harrington (October 21, 1942 – January 23, 1993) was an American astronomer who worked at US Naval Observatory. ... Marc W. Buie is an American astronomer. ... Lowell Observatory Percival observing Mars from the Clark telescope at the Lowell Observatory. ... The British Broadcasting Corporation (BBC, sometimes also known as the Beeb or Auntie) is the largest broadcasting corporation in the world, founded in 1922. ... September 12 is the 255th day of the year (256th in leap years). ... 2005 (MMV) was a common year starting on Saturday of the Gregorian calendar. ... The European Southern Observatory (ESO) is an international astronomical organisation, composed and supported by ten countries from the European Union plus Switzerland and was created in 1962. ... July 11 is the 192nd day (193rd in leap years) of the year in the Gregorian Calendar, with 173 days remaining. ... February 3 is the 34th day of the year in the Gregorian Calendar. ... 2006 (MMVI) is a common year starting on Sunday of the Gregorian calendar. ... Major features of the solar system (not to scale): The Sun, the eight planets, the asteroid belt, dwarf planet Pluto, and a comet. ... Image File history File links Eight_Planets. ... The Pleiades, an open cluster in the constellation of Taurus A star is a massive, compact body of plasma in outer space that is currently producing or has produced energy through nuclear fusion. ... The Sun is the star at the center of our solar system. ... Displays the remaining eight planets with the three new dwarf planets. ... Note: This article contains special characters. ... Adjective Venusian or (rarely) Cytherean (*min temperature refers to cloud tops only) Atmospheric characteristics Atmospheric pressure 9. ... Earth (often referred to as the Earth) is the third planet in the solar system in terms of distance from the Sun, and the fifth in order of size. ... For the Roman god, see Mars (mythology). ... Adjective Jovian Atmospheric characteristics Atmospheric pressure 70 kPa Hydrogen ~86% Helium ~14% Methane 0. ... Note: This article contains special characters. ... Adjective Uranian Atmospheric characteristics Atmospheric pressure 120 kPa (at the cloud level) Hydrogen 83% Helium 15% Methane 1. ... Adjective Neptunian Atmospheric characteristics Surface pressure ≫100 MPa Hydrogen - H2 80% ±3. ... It has been suggested that Table of dwarf planets in the solar system be merged into this article or section. ... 1 Ceres (seer-eez (key), IPA , Latin CerÄ“s) was the first asteroid to be discovered (indicated by the 1 in its name). ... Adjective Plutonian Atmospheric characteristics Atmospheric pressure 0. ... 2003 UB313 is a trans-Neptunian object (TNO) believed to be larger than the planet Pluto. ... Bulk composition of the moons mantle and crust estimated, weight percent Oxygen 42. ... Image of the main asteroid belt between the orbits of Mars and Jupiter. ... Comet Hale-Bopp For other uses, see Comet (disambiguation). ... Artists rendering of the Kuiper Belt and hypothetical more distant Oort cloud. ... The scattered disc (or scattered disk) is a distant region of our solar system, thinly populated by icy planetoids known as scattered disk objects (SDOs), a subset of the broader family of trans-Neptunian objects (TNOs). ... This image is an artists rendering of the Oort cloud and the Kuiper Belt. ... See also Lists of astronomical objects Category: ... Major features of the solar system (not to scale): The Sun, the eight planets, the asteroid belt, dwarf planet Pluto, and a comet. ... 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 is a list of solar system objects by radius, in decreasing order. ... This is a list of Solar system objects by mass, in decreasing order. ...

 v·d·e 
Trans-Neptunian objects
Dwarf planets : Pluto | 2003 UB313

Plutinos : Pluto* | 1993 RO | 1993 RP | 1993 SB | 1993 SC | 1994 TB | 1995 QZ9 | 1996 SZ4 | 1996 TP66 | 38083 Rhadamanthus | 38628 Huya | 28978 Ixion | 2003 VS2 | 90482 Orcus A trans-Neptunian object (TNO) is any object in the solar system that orbits the sun at a greater distance on average than Neptune. ... It has been suggested that Table of dwarf planets in the solar system be merged into this article or section. ... Adjective Plutonian Atmospheric characteristics Atmospheric pressure 0. ... 2003 UB313 is a trans-Neptunian object (TNO) believed to be larger than the planet Pluto. ... In astronomy, a plutino is a trans-Neptunian object that has a 3:2 orbital resonance with Neptune. ... Adjective Plutonian Atmospheric characteristics Atmospheric pressure 0. ... 1993 RO is a trans-Neptunian object of the Plutino class. ... (15788) 1993 SB is a trans-Neptunian object of the Plutino class. ... 38083 Rhadamanthus (formerly known as (38083) 1999 HX11) is a trans-Neptunian object. ... 38628 Huya (original provisional designation: 2000 EB173) is a trans-Neptunian object. ... (28978) Ixion (ik·sye·un) is a Kuiper belt object discovered on May 22, 2001 with a diameter of < 822 km and a semimajor axis of about 39. ... 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. ...


Cubewanos: 1998 WW31 | 1992 QB1 | 1994 GV9 | 1994 JQ1 | 1994 VK8 | 1996 TO66 | 19521 Chaos | 53311 Deucalion | 2002 AW197 | 50000 Quaoar | 2002 MS4 | 2002 TX300 | 2002 UX25 | 58534 Logos | 2004 GV9| Unnumbered: 2003 AZ84 | 2003 EL61 | 2003 QW90 | 2005 FY9 | 2005 RN43 A cubewano is any substantial Kuiper belt object, orbiting beyond about 41 AU and not controlled by resonances with the outer planets. ... 1998 WW31 (also written 1998 WW31) is an object of the solar system located beyond the orbit of Neptune. ... (15760) 1992 QB1 (also written (15760) 1992 QB1) was the first trans-Neptunian object to be discovered after Pluto and Charon. ... (19308) 1996 TO66 (also written (19308) 1996 TO66) is a trans-Neptunian object. ... 19521 Chaos (1998 WH24) is a cubewano, a Kuiper belt object not in resonance with any planet. ... 53311 Deucalion (original provisional designation: 1999 HU11) is a trans-Neptunian object. ... (55565) 2002 AW197 is a trans-Neptunian object. ... Artists impression by G. Bacon of STScI / NASA 50000 Quaoar (pronounced kwah·war, kwah·wor, or kwow·ur, Tongva ) [1] is a Trans-Neptunian object orbiting the Sun in the Edgeworth-Kuiper belt. ... (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. ... (90568) 2004 GV9 (also written (90568) 2004 GV9) is a trans-Neptunian object. ... 2003 EL61 (also written 2003 EL61), nicknamed Santa (non-official designation), is a large and very unusual Kuiper belt object discovered by Mike Brown at Caltech in the United States. ... 2005 FY9 (also written 2005 FY9), codenamed Easterbunny by its discoverers, is a very large Kuiper belt object discovered on March 31, 2005 by the team led by Michael Brown. ...


Twotinos: Unnumbered: 1996 TR66 | 1998 SM165 | 1997 SZ10 | 1999 RB216 | 2000 JG81 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. ...


Scattered disc objects: 2002 TC302 | 1995 TL8 | 1996 GQ21 | 1996 TL66 | 2000 OO67 | 2000 OM67 | 2001 KC77 | 2001 UR163 | 2002 CY224 | 2002 GX32 | Unnumbered: 2003 UB313** | 2004 XR190 The scattered disc (or scattered disk) is a distant region of our solar system, thinly populated by icy planetoids known as scattered disk objects (SDOs), a subset of the broader family of trans-Neptunian objects (TNOs). ... (84522) 2002TC302 is a large Scattered Disk Object (SDO), orbiting the sun at a distance of 39. ... (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. ... (15874) 1996 TL66 is a trans-Neptunian object that resides in the Kuyper belt. ... 2000 OO67 is a Trans Neptunian Object notable for its highly eccentric orbit. ... 2003 UB313 is a trans-Neptunian object (TNO) believed to be larger than the planet Pluto. ... 2004 XR190 (also written 2004 XR190) is a newly discovered trans-Neptunian object located in the scattered disc. ...


Unclassified Objects : 1994 JS | 1994 JR1 | 1995 DA2 | 1995 SM55 | 1996 TQ66 | 1997 CR29 | 1997 CS29 | 1997 CU29 | 1997 QJ4 | 1998 HJ151 | 1998 HK151 | 1998 HP151 | 1998 HM151 | 1998 KR65 | 1998 SM165 | 1998 SN1651998 US43 | 1998 VG44 | 1998 WW24 | 1998 WA31 | 1998 WU31 | 1998 WA25 | 1999 CP133 | 1999 CL158 | 1999 CC158 | 1999 DF9 | 1999 HT11 | 1999 HB12 | 1999 HC12 | 1999 KR16 | 1999 OY3


Natural satellites : Charon (Pluto) | Hydra (Pluto) | Nix (Pluto) | S/2000 (1998 WW31) 1 | S/2005 (2003 EL61) 1 | S/2005 (2003 EL61) 2 | S/2005 (2003 UB313) 1 | (58534) Logos I Zoe Moons of solar system scaled to Earths Moon A natural satellite is a moon (not capitalized), that is, any natural object that orbits a planet. ... 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. ... 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. ... S/2005 (2003 UB313) 1 is a moon around the cubewano Kuiper Belt trans-Neptunian object 2003 UB313, the presumed tenth planet of our Solar System. ...


edit Pluto's natural satellites
Charon · Nix · Hydra
See also : Pronunciation key
 v·d·e 
Large trans-Neptunian objects
Kuiper belt: Orcus | Pluto (Charon) | Ixion | 2002 UX25 | Varuna | 2002 TX300 | 2003 EL61 | Quaoar | 2005 FY9 | 2002 AW197
Scattered disc: 2002 TC302 | 2003 UB313 | 2004 XR190 | Sedna
 See also Triton, astronomical objects and the solar system's list of objects, sorted by radius or mass
For pronunciation, see: Centaur and TNO pronunciation.
† Current MPC classification. Some consider Sedna an Oort cloud object.

 
 

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