Pluto

---------------------------------------------------------

Taken from: Wikipedia

---------------------------------------------------------

Pluto

Computer-generated map of Pluto from Hubble images, synthesized true color[a] and among the highest resolutions possible with current technology.
Discovery
Discovered by	Clyde W. Tombaugh
Discovery date	February 18, 1930
Designations
MPC designation	134340 Pluto
Pronunciation	i/ˈpluːtoʊ/
Named after	Pluto
Minor planet category	dwarf planet TNO plutoid KBO plutino
Adjective	Plutonian
Orbital characteristics[6][b]
Epoch J2000
Aphelion	7,311,000,000 km 48.871 AU
Perihelion	4,437,000,000 km 29.657 AU (1989 Sep 05)[1]
Semi-major axis	5,874,000,000 km 39.264 AU
Eccentricity	0.244 671 664 (J2000) 0.248 807 66 (mean)[2]
Orbital period	90,465 days[2][3] 247.68 years[2] 14,164.4 Pluto solar days[3]
Synodic period	366.73 days[2]
Average orbital speed	4.7 km/s[2]
Mean anomaly	14.86012204°[4]
Inclination	17.151 394° 11.88° to Sun's equator
Longitude of ascending node	110.286 83°
Argument of perihelion	113.763 49°
Satellites	5[5]
Physical characteristics
Mean radius	1153 ± 10 km[7] 0.18 Earths 1161 km[8] (solid)
Surface area	1.665×107 km2[c] 0.033 Earths
Volume	6.39×109 km3[d] 0.0059  Earths
Mass	(1.305 ± 0.007)×1022 kg[7] 0.00218 Earths 0.178 Moons
Mean density	2.03 ± 0.06 g/cm3[7]
Equatorial surface gravity	0.658 m/s2[e] 0.067 g
Escape velocity	1.229 km/s[f]
Sidereal rotation period	−6.387 230 day 6 d 9 h 17 m 36 s
Equatorial rotation velocity	47.18 km/h
Axial tilt	119.591 ± 0.014° (to orbit)[7][g]
North pole right ascension	312.993°[9]
North pole declination	6.163°[9]
Albedo	0.49–0.66 (geometric, varies by 35%)[2][10]
Surface temp. min mean max Kelvin 33 K 44 K 55 K
Apparent magnitude	13.65[2] to 16.3[11] (mean is 15.1)[2]
Absolute magnitude (H)	−0.7[12]
Angular diameter	0.065" to 0.115"[2][h]
Atmosphere
Surface pressure	0.30 Pa (summer maximum)
Composition	nitrogen, methane, carbon monoxide[13]