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Discovered by | Clyde W. Tombaugh |
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Discovery date | February 18, 1930 |
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MPC designation | 134340 Pluto |
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Pronunciation | how to say: /ˈpluːtoʊ/, |
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| dwarf planet, TNO, plutoid, KBO, plutino |
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Adjectives | Plutonian |
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Epoch J2000 |
Aphelion | 7,375,927,931 km 49.305 032 87 AU |
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Perihelion | 4,436,824,613 km 29.658 340 67 AU |
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| 5,906,376,272 km 39.481 686 77 AU |
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Eccentricity | 0.248 807 66 |
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| 90,613.305 days 248.09 years 14,164.4 Pluto solar days |
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| 366.73 days |
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| 4.666 km/s |
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Inclination | 17.141 75° 11.88° to Sun's equator |
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| 110.303 47° |
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| 113.763 29° |
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Known satellites | 5 |
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Mean radius | 1,187 ± 4 km 0.18 Earths |
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| 1.665×107 km² 0.033 Earths |
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Volume | 6,39×109 km³ 0.0059 Earths |
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Mass | (1.305 ± 0.007)×1022 kg 0.002 1 Earths 0.178 moon |
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| 2.03 ± 0.06 g/cm³ |
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| 0.658 m/s² 0.067 g |
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| 1.229 km/s |
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| −6.387 230 day 6 d 9 h 17 m 36 s |
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Equatorial rotation velocity | 47.18 km/h |
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| 119.591 ± 0.014° (to orbit) |
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| 133.046 ± 0.014° |
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| −6.145 ± 0.014° |
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Albedo | 0.49–0.66 (varies by 35%) |
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| up to 13.65 (mean is 15.1) |
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| −0.7 |
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| 0.30 Pa (summer maximum) |
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Composition by volume | nitrogen, methane, carbon monoxide |
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