why do Pluto is not there
Answers
Pluto (minor planet designation: 134340 Pluto) is a dwarf planet in the Kuiper belt, a ring of bodies beyond the orbit of Neptune. It was the first and the largest Kuiper belt object to be discovered.
Pluto
2nd Astronomical symbol for Pluto
Pluto in True Color - High-Res.jpg
Northern hemisphere of Pluto in true color, taken by NASA's New Horizons probe in 2015[a]
Discovery
Discovered by
Clyde W. Tombaugh
Discovery site
Lowell Observatory
Discovery date
February 18, 1930
Designations
Designation
(134340) Pluto
Pronunciation
/ˈpluːtoʊ/ (About this soundlisten)
Named after
Pluto
Minor planet category
Dwarf planet
Trans-Neptunian object
Plutoid
Kuiper belt object
Plutino
Adjectives
Plutonian /pluːˈtoʊniən/[1]
Orbital characteristics[4][b]
Epoch J2000
Earliest precovery date
August 20, 1909
Aphelion
49.305 AU
(7.37593 billion km)
February 2114
Perihelion
29.658 AU
(4.43682 billion km)[2]
(September 5, 1989)[3]
Semi-major axis
39.482 AU
(5.90638 billion km)
Eccentricity
0.2488
Orbital period
247.94 years[2]
90,560 d[2]
Synodic period
366.73 days[2]
Average orbital speed
4.743 km/s[2]
Mean anomaly
14.53 deg
Inclination
17.16°
(11.88° to Sun's equator)
Longitude of ascending node
110.299°
Argument of perihelion
113.834°
Known satellites
5
Physical characteristics
Dimensions
2,376.6±1.6 km (observations consistent with a sphere, predicted deviations too small to be observed)[5]
Mean radius
1,188.3±0.8 km[6][5]
0.1868 Earths
Flattening
<1%[7]
Surface area
1.779×107 km2[c]
0.035 Earths
Volume
(7.057±0.004)×109 km3[d]
0.00651 Earths
Mass
(1.303±0.003)×1022 kg[7]
0.00218 Earths
0.177 Moons
Mean density
1.854±0.006 g/cm3[6][7]
Surface gravity
0.620 m/s2[e]
0.063 g
Escape velocity
1.212 km/s[f]
Sidereal rotation period
6.387230 d
6 d, 9 h, 17 m, 36 s
Equatorial rotation velocity
47.18 km/h
Axial tilt
122.53° (to orbit)[2]
North pole right ascension
132.993°[8]
North pole declination
−6.163°[8]
Albedo
0.49 to 0.66 (geometric, varies by 35%)[2][9]
Surface temp. min mean max
Kelvin 33 K 44 K (−229 °C) 55 K
Apparent magnitude
13.65[2] to 16.3[10]
(mean is 15.1)[2]
Absolute magnitude (H)
−0.7[11]
Angular diameter
0.06″ to 0.11″[2][g]
Atmosphere
Surface pressure
1.0 Pa (2015)[7][13]
Composition by volume
Nitrogen, methane, carbon monoxide[12]
Pluto was discovered by Clyde Tombaugh in 1930 and declared to be the ninth planet from the Sun. After 1992, its status as a planet was questioned following the discovery of several objects of similar size in the Kuiper belt. In 2005, Eris, a dwarf planet in the scattered disc which is 27% more massive than Pluto, was discovered. This led the International Astronomical Union (IAU) to define the term "planet" formally in 2006, during their 26th General Assembly. That definition excluded Pluto and reclassified it as a dwarf planet.
Pluto is the ninth-largest and tenth-most-massive known object directly orbiting the Sun. It is the largest known trans-Neptunian object by volume but is less massive than Eris. Like other Kuiper belt objects, Pluto is primarily made of ice and rock and is relatively small—one-sixth the mass of the Moon and one-third its volume. It has a moderately eccentric and inclined orbit during which it ranges from 30 to 49 astronomical units or AU (4.4–7.4 billion km) from the Sun. This means that Pluto periodically comes closer to the Sun than Neptune, but a stable orbital resonance with Neptune prevents them from colliding. Light from the Sun takes 5.5 hours to reach Pluto at its average distance (39.5 AU).
Pluto has five known moons: Charon (the largest, with a diameter just over half that of Pluto), Styx, Nix, Kerberos, and Hydra. Pluto and Charon are sometimes considered a binary system because the barycenter of their orbits does not lie within either body.
The New Horizons spacecraft performed a flyby of Pluto on July 14, 2015, becoming the first and, to date, only spacecraft to do so. During its brief flyby, New Horizons made detailed measurements and observations of Pluto and its moons. In September 2016, astronomers announced that the reddish-brown cap of the north pole of Charon is composed of tholins, organic macromolecules that may be ingredients for the emergence of life, and produced from methane, nitrogen and other gases released from the atmosphere of Pluto and transferred 19,000 km (12,000 mi) to the orbiting moon.
Answer:
Pluto to that of a dwarf planet because it did not meet the three criteria the IAU uses to define a full-sized planet. Essentially Pluto meets all the criteria except one—it “has not cleared its neighboring region of other objects.”Nov
Explanation:
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