<Table> Pluto <Tr> <Td_colspan="2"> Pluto in true color, imaged by New Horizons </Td> </Tr> <Tr> <Th_colspan="2"> Discovery </Th> </Tr> <Tr> <Th> Discovered by </Th> <Td> Clyde W. Tombaugh </Td> </Tr> <Tr> <Th> Discovery date </Th> <Td> February 18, 1930 </Td> </Tr> <Tr> <Th_colspan="2"> Designations </Th> </Tr> <Tr> <Th> MPC designation </Th> <Td> (134340) Pluto </Td> </Tr> <Tr> <Th> Pronunciation </Th> <Td> / ˈpluːtoʊ / (listen) </Td> </Tr> <Tr> <Th> Named after </Th> <Td> Pluto </Td> </Tr> <Tr> <Th> Minor planet category </Th> <Td> <Ul> <Li> Dwarf planet </Li> <Li> Trans - Neptunian object </Li> <Li> Plutoid </Li> <Li> Kuiper belt object </Li> <Li> Plutino </Li> </Ul> </Td> </Tr> <Tr> <Th> Adjectives </Th> <Td> Plutonian </Td> </Tr> <Tr> <Th_colspan="2"> Orbital characteristics </Th> </Tr> <Tr> <Td_colspan="2"> Epoch J2000 </Td> </Tr> <Tr> <Th> Earliest precovery date </Th> <Td> August 20, 1909 </Td> </Tr> <Tr> <Th> Aphelion </Th> <Td> <Ul> <Li> 7012737592301486350 ♠ 49.305 AU </Li> <Li> (7000737593000000000 ♠ 7.37593 billion km) </Li> <Li> February 2114 </Li> </Ul> </Td> </Tr> <Tr> <Th> Perihelion </Th> <Td> <Ul> <Li> 7012443677364922060 ♠ 29.658 AU </Li> <Li> (7000443682000000000 ♠ 4.43682 billion km) </Li> <Li> (September 5, 1989) </Li> </Ul> </Td> </Tr> <Tr> <Th> Semi-major axis </Th> <Td> <Ul> <Li> 7012590612393523600 ♠ 39.48 AU </Li> <Li> (7000590638000000000 ♠ 5.90638 billion km) </Li> </Ul> </Td> </Tr> <Tr> <Th> Eccentricity </Th> <Td> 6999248800000000000 ♠ 0.2488 </Td> </Tr> <Tr> <Th> Orbital period </Th> <Td> <Ul> <Li> 7002248000000000000 ♠ 248.00 years </Li> <Li> 7009782438400000000 ♠ 90,560 d </Li> </Ul> </Td> </Tr> <Tr> <Th> Synodic period </Th> <Td> 366.73 days </Td> </Tr> <Tr> <Th> Average orbital speed </Th> <Td> 4.67 km / s </Td> </Tr> <Tr> <Th> Mean anomaly </Th> <Td> 7001145300000000000 ♠ 14.53 deg </Td> </Tr> <Tr> <Th> Inclination </Th> <Td> <Ul> <Li> 6999299498499642227 ♠ 17.16 ° </Li> <Li> (11.88 ° to Sun's equator) </Li> </Ul> </Td> </Tr> <Tr> <Th> Longitude of ascending node </Th> <Td> 7000192508071165723 ♠ 110.299 ° </Td> </Tr> <Tr> <Th> Argument of perihelion </Th> <Td> 7000198677810071522 ♠ 113.834 ° </Td> </Tr> <Tr> <Th> Known satellites </Th> <Td> 5 </Td> </Tr> <Tr> <Th_colspan="2"> Physical characteristics </Th> </Tr> <Tr> <Th> Mean radius </Th> <Td> <Ul> <Li> 7006118830000000000 ♠ 1,188.3 ± 1.6 km </Li> <Li> 0.1868 Earths </Li> </Ul> </Td> </Tr> <Tr> <Th> Flattening </Th> <Td> <1% </Td> </Tr> <Tr> <Th> Surface area </Th> <Td> <Ul> <Li> 7013177900000000000 ♠ 1.779 × 10 km </Li> <Li> 0.035 Earths </Li> </Ul> </Td> </Tr> <Tr> <Th> Volume </Th> <Td> <Ul> <Li> 7018705700000000000 ♠ (7.057 ± 0.004) × 10 km </Li> <Li> 6997651000000000000 ♠ 0.006 51 Earths </Li> </Ul> </Td> </Tr> <Tr> <Th> Mass </Th> <Td> <Ul> <Li> 7022130299999999999 ♠ (1.303 ± 0.003) × 10 kg </Li> <Li> 6997218000000000000 ♠ 0.00218 Earths </Li> <Li> 0.177 Moons </Li> </Ul> </Td> </Tr> <Tr> <Th> Mean density </Th> <Td> 7003185400000000000 ♠ 1.854 ± 0.006 g / cm </Td> </Tr> <Tr> <Th> Surface gravity </Th> <Td> <Ul> <Li> 6999620000000000000 ♠ 0.620 m / s </Li> <Li> 0.063 g </Li> </Ul> </Td> </Tr> <Tr> <Th> Escape velocity </Th> <Td> 7000121200000000000 ♠ 1.212 km / s </Td> </Tr> <Tr> <Th> Sidereal rotation period </Th> <Td> <Ul> <Li> 7005551856672000000 ♠ 6.387 230 d </Li> <Li> 6 d, 9 h, 17 m, 36 s </Li> </Ul> </Td> </Tr> <Tr> <Th> Equatorial rotation velocity </Th> <Td> 47.18 km / h </Td> </Tr> <Tr> <Th> Axial tilt </Th> <Td> 7000213855193246865 ♠ 122.53 ° (to orbit) </Td> </Tr> <Tr> <Th> North pole right ascension </Th> <Td> 132.993 ° </Td> </Tr> <Tr> <Th> North pole declination </Th> <Td> − 6.163 ° </Td> </Tr> <Tr> <Th> Albedo </Th> <Td> 0.49 to 0.66 (geometric, varies by 35%) </Td> </Tr> <Tr> <Td_colspan="2"> <Table> <Tr> <Th> Surface temp . </Th> <Th> min </Th> <Th> mean </Th> <Th> max </Th> </Tr> <Tr> <Th> Kelvin </Th> <Td> 33 K </Td> <Td> 44 K (− 229 ° C) </Td> <Td> 55 K </Td> </Tr> </Table> </Td> </Tr> <Tr> <Th> Apparent magnitude </Th> <Td> 13.65 to 16.3 (mean is 15.1) </Td> </Tr> <Tr> <Th> Absolute magnitude (H) </Th> <Td> − 0.7 </Td> </Tr> <Tr> <Th> Angular diameter </Th> <Td> 0.06" to 0.11" </Td> </Tr> <Tr> <Th_colspan="2"> Atmosphere </Th> </Tr> <Tr> <Th> Surface pressure </Th> <Td> 1.0 Pa (2015) </Td> </Tr> <Tr> <Th> Composition by volume </Th> <Td> Nitrogen, methane, carbon monoxide </Td> </Tr> </Table> <Tr> <Td_colspan="2"> Pluto in true color, imaged by New Horizons </Td> </Tr>

Pluto's distance from the sun in km
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