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Pluto
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Planet Information

  Bgcolour #A0FFA0
  Name Pluto
  Caption Reconstructed map of Pluto, approximately true colour, and at highest resolution possible with current methods
  Discovery yes
  Discoverer Clyde W Tombaugh
  Discovered February 18 , 1930
  Mp Name '''134340 Pluto'''
  Mp Category Dwarf Planet
  Epoch J2000
  Aphelion 7,375,927,931 Km <br />49305 032 87 AU
  Perihelion 4,436,824,613&nbspkm<br />29658 340 67 AU
  Semimajor 5,906,376,272&nbspkm<br />39481 686 77 AU
  Eccentricity 0248 807 66
  Inclination 17141 75°<br />(1188° to Sun's equator)
  Asc Node 110303 47°
  Arg Peri 113763 29°
  Orbital Circ 36530 T M <br />244186 AU
  Sidereal Period 90,6133055 day<br />(24809 Yr )
  Synodic Period 36673 day
  Avg Speed 4666&nbspkm/s
  Max Speed 6112&nbspkm/s
  Min Speed 3676&nbspkm/s
  Satellites 3
  Physical Characteristics yes
  Mean Radius 1195 km <sup> {Link without Title} </sup> <br />(19% of Earth)
  Surface Area 1795 Km&2 <br />(0033 Earths)
  Volume 715 Km³ <br />(00066 Earths)
  Mass (1305±0007) Kg <br />(00021 Earths)
  Density 203±006 g/cm³
  Surface Grav 058 M/s&2 <br />(0059 Gee )
  Escape Velocity 12&nbspkm/s
  Sidereal Day −6387230 Day <br />(6 d 9 h 17 m 36 s)
  Rot Velocity 4718&nbspkm/h (at the equator)
  Axial Tilt 119591 ± 0014° (to orbit){{cite journal
  Author M W Buie, W M Grundy, E F Young, L A Young, S A Stern
  Title Orbits and photometry of Pluto's satellites: Charon, S/2005 P1, and S/2005 P2
  Journal Astronomical Journal
  Year 2006
  Volume 132
  Pages 290
  Url http://adsabsharvardedu/cgi-bin/nph-bib_querybibcode=2006AJ132290B&ampdb_key=AST&ampdata_type=HTML&ampformat=&amphigh=444b66a47d27727


  Right Asc North Pole 133046 ± 0014°
  Declination -6145 ± 0014°
  Albedo 049–066 (varies by 35%) <sup> [http://nssdcgsfcnasagov/planetary/factsheet/plutofacthtml </sup>
  Adjectives Plutonian
  Atmosphere yes
  Temperatures yes
  Temp Name1 Kelvin
  Min Temp 1 33 K
  Mean Temp 1 44 K
  Max Temp 1 55 K
  Surface Pressure 030 Pascal s (summer maximum)
  Atmosphere Composition Nitrogen , Methane



Pluto (), also Designated '''134340 Pluto''', is the second-largest known Dwarf Planet in the Solar System and the tenth-largest body observed directly orbiting the Sun. Originally considered a planet, Pluto is now recognised as the largest member of a distinct region called the Kuiper Belt . Like other members of the belt, it is primarily composed of rock and ice and is relatively small; approximately a fifth the mass of the Earth 's Moon and a third its volume. It has an Eccentric Orbit that takes it from 30 to 49 AU (4.4–7.4 billion km) from the Sun , and is highly inclined with respect to the planets. As a result, Pluto occasionally comes closer to the Sun than the planet Neptune .

Pluto and its largest moon, Charon , are often considered a Binary System because the Barycentre of their orbits does not lie within either body.