Social Sciences, asked by saivaishnavi39, 6 months ago

why do Pluto is not there​

Answers

Answered by kalivyasapalepu99
2

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.

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Answered by ndmanjunath15
1

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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