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Dwarf planet

Index Dwarf planet

A dwarf planet is a planetary-mass object that is neither a planet nor a natural satellite. [1]

123 relations: Absolute magnitude, Acceleration, Alan Stern, Ariel (moon), Asteroid, Asteroid belt, Astronomical unit, Astronomy & Astrophysics, Atmosphere, Axial tilt, Barycenter, Callisto (moon), Centaur (minor planet), Ceres (dwarf planet), Charon (moon), Classical Kuiper belt object, Clearing the neighbourhood, Comet, Compressive strength, Dawn (spacecraft), Density, Detached object, Dione (moon), Dwarf star, Dysnomia (moon), Earth, Earth mass, Ellipsoid, Enceladus, Eris (dwarf planet), Escape velocity, Europa (moon), Fundamental Astronomy, Galilean moons, Ganymede (moon), Geometric albedo, Gonzalo Tancredi, Gravity, Harold F. Levison, Haumea, How I Killed Pluto and Why It Had It Coming, Hubble Space Telescope, Hydrostatic equilibrium, Iapetus (moon), IAU definition of planet, International Astronomical Union, Io (moon), James L. Hilton, Jean-Luc Margot, Julio Ángel Fernández, ..., Jupiter, Kelvin, Kuiper belt, Lambda, List of gravitationally rounded objects of the Solar System, List of possible dwarf planets, Lists of planets, Lists of small Solar System bodies, Lowell Observatory, Makemake, Mars, Mass, Mercury (planet), Mesoplanet, Michael E. Brown, Mimas (moon), Miranda (moon), Moon, Moons of Haumea, Moons of Pluto, Mu (letter), NASA, Natural satellite, Neptune, New Horizons, Oberon (moon), Orbital eccentricity, Orbital inclination, Orbital period, Orders of magnitude (mass), Ottawa Citizen, PDF, Phoebe (moon), Pi, Planet, Planetary system, Planetesimal, Planets beyond Neptune, Plasticity (physics), Plutino, Pluto, Plutoid, Pluton, Resonant trans-Neptunian object, Rhea (moon), Rheasilvia, Rotation period, Saturn, Scattered disc, Shape, Small Solar System body, Solar System, Speed, Spheroid, Steven Soter, Temperature, Terrestrial planet, Tethys (moon), Tidal heating, Tidal locking, Titan (moon), Titania (moon), Trans-Neptunian object, Triton (moon), Umbriel (moon), Uranus, Veneneia, Venus, 2 Pallas, 4 Vesta, 50000 Quaoar, 90377 Sedna, 90482 Orcus. Expand index (73 more) »

Absolute magnitude

Absolute magnitude is a measure of the luminosity of a celestial object, on a logarithmic astronomical magnitude scale.

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In physics, acceleration is the rate of change of velocity of an object with respect to time.

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Alan Stern

Sol Alan Stern (born November 22, 1957) is an American engineer and planetary scientist.

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Ariel (moon)

Ariel is the fourth-largest of the 27 known moons of Uranus.

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Asteroids are minor planets, especially those of the inner Solar System.

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Asteroid belt

The asteroid belt is the circumstellar disc in the Solar System located roughly between the orbits of the planets Mars and Jupiter.

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Astronomical unit

The astronomical unit (symbol: au, ua, or AU) is a unit of length, roughly the distance from Earth to the Sun.

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Astronomy & Astrophysics

Astronomy & Astrophysics is a peer-reviewed scientific journal covering theoretical, observational, and instrumental astronomy and astrophysics.

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An atmosphere is a layer or a set of layers of gases surrounding a planet or other material body, that is held in place by the gravity of that body.

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Axial tilt

In astronomy, axial tilt, also known as obliquity, is the angle between an object's rotational axis and its orbital axis, or, equivalently, the angle between its equatorial plane and orbital plane.

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The barycenter (or barycentre; from the Ancient Greek βαρύς heavy + κέντρον centre) is the center of mass of two or more bodies that are orbiting each other, which is the point around which they both orbit.

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Callisto (moon)

Callisto (Jupiter IV) is the second-largest moon of Jupiter, after Ganymede.

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Centaur (minor planet)

Centaurs are small solar system bodies with a semi-major axis between those of the outer planets.

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Ceres (dwarf planet)

Ceres (minor-planet designation: 1 Ceres) is the largest object in the asteroid belt that lies between the orbits of Mars and Jupiter, slightly closer to Mars' orbit.

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Charon (moon)

Charon, also known as (134340) Pluto I, is the largest of the five known natural satellites of the dwarf planet Pluto.

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Classical Kuiper belt object

A classical Kuiper belt object, also called a cubewano ("QB1-o"), is a low-eccentricity Kuiper belt object (KBO) that orbits beyond Neptune and is not controlled by an orbital resonance with Neptune.

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Clearing the neighbourhood

"Clearing the neighbourhood around its orbit" is a criterion for a celestial body to be considered a planet in the Solar System.

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A comet is an icy small Solar System body that, when passing close to the Sun, warms and begins to release gases, a process called outgassing.

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Compressive strength

Compressive strength or compression strength is the capacity of a material or structure to withstand loads tending to reduce size, as opposed to tensile strength, which withstands loads tending to elongate.

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Dawn (spacecraft)

Dawn is a space probe launched by NASA in September 2007 with the mission of studying two of the three known protoplanets of the asteroid belt, Vesta and Ceres.

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The density, or more precisely, the volumetric mass density, of a substance is its mass per unit volume.

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Detached object

Detached objects are a dynamical class of minor planets in the outer reaches of the Solar System and belong to the broader family of trans-Neptunian objects (TNOs).

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Dione (moon)

Dione (Διώνη) is a moon of Saturn.

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Dwarf star

A dwarf star is a star of relatively small size and low luminosity.

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Dysnomia (moon)

Dysnomia (Greek: Δυσνομία)—officially (136199) Eris I Dysnomia—is the only known moon of the dwarf planet Eris (the most massive known dwarf planet in the Solar System).

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Earth is the third planet from the Sun and the only astronomical object known to harbor life.

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Earth mass

Earth mass (where ⊕ is the standard astronomical symbol for planet Earth) is the unit of mass equal to that of Earth.

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An ellipsoid is a surface that may be obtained from a sphere by deforming it by means of directional scalings, or more generally, of an affine transformation.

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Enceladus is the sixth-largest moon of Saturn.

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Eris (dwarf planet)

Eris (minor-planet designation 136199 Eris) is the most massive and second-largest (by volume) dwarf planet in the known Solar System.

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Escape velocity

In physics, escape velocity is the minimum speed needed for an object to escape from the gravitational influence of a massive body.

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Europa (moon)

Europa or as Ευρώπη (Jupiter II) is the smallest of the four Galilean moons orbiting Jupiter, and the sixth-closest to the planet.

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Fundamental Astronomy

Fundamental Astronomy (1984–2017) is an astronomy textbook by Finnish author Hannu Karttunen of University of Turku; Pekka Kröger and Heikki Oja of University of Helsinki; Markku Poutanen of Finnish Geodetic Institute; and Karl Johan Donner of University of Helsinki.

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Galilean moons

The Galilean moons are the four largest moons of Jupiter—Io, Europa, Ganymede, and Callisto.

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Ganymede (moon)

Ganymede (Jupiter III) is the largest and most massive moon of Jupiter and in the Solar System.

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Geometric albedo

In astronomy, the geometric albedo of a celestial body is the ratio of its actual brightness as seen from the light source (i.e. at zero phase angle) to that of an idealized flat, fully reflecting, diffusively scattering (Lambertian) disk with the same cross-section.

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Gonzalo Tancredi

Gonzalo Tancredi (born 3 August 1963) is an Uruguayan astronomer and associated professor in the Department of Astronomy at the University of the Republic in Montevideo, Uruguay.

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Gravity, or gravitation, is a natural phenomenon by which all things with mass or energy—including planets, stars, galaxies, and even light—are brought toward (or gravitate toward) one another.

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Harold F. Levison

Harold F. (Hal) Levison is a planetary scientist specializing in planetary dynamics.

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Haumea, minor-planet designation 136108 Haumea, is a dwarf planet located beyond Neptune's orbit.

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How I Killed Pluto and Why It Had It Coming

How I Killed Pluto and Why It Had It Coming is the 2010 memoir by Mike Brown, the American astronomer most responsible for the reclassification of the former planet Pluto from planet to dwarf planet.

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Hubble Space Telescope

The Hubble Space Telescope (HST) is a space telescope that was launched into low Earth orbit in 1990 and remains in operation.

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Hydrostatic equilibrium

In fluid mechanics, a fluid is said to be in hydrostatic equilibrium or hydrostatic balance when it is at rest, or when the flow velocity at each point is constant over time.

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Iapetus (moon)

Iapetus (Ιαπετός), or occasionally Japetus, is the third-largest natural satellite of Saturn, eleventh-largest in the Solar System, and the largest body in the Solar System known not to be in hydrostatic equilibrium.

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IAU definition of planet

The International Astronomical Union (IAU) defined in August 2006 that, in the Solar System, a planet is a celestial body which.

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International Astronomical Union

The International Astronomical Union (IAU; Union astronomique internationale, UAI) is an international association of professional astronomers, at the PhD level and beyond, active in professional research and education in astronomy.

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Io (moon)

Io (Jupiter I) is the innermost of the four Galilean moons of the planet Jupiter.

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James L. Hilton

James Lindsay Hilton (born February 21, 1957) has been an astronomer at the United States Naval Observatory since 1986.

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Jean-Luc Margot

Jean-Luc Margot (born 1969) is a Belgian-born astronomer and a UCLA professor who specializes in planetary sciences.

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Julio Ángel Fernández

Julio Ángel Fernández Alves (born Montevideo, 5 April 1946) is a Uruguayan astronomer and teacher, member of the department of astronomy at the Universidad de la República in Montevideo.

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Jupiter is the fifth planet from the Sun and the largest in the Solar System.

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The Kelvin scale is an absolute thermodynamic temperature scale using as its null point absolute zero, the temperature at which all thermal motion ceases in the classical description of thermodynamics.

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Kuiper belt

The Kuiper belt, occasionally called the Edgeworth–Kuiper belt, is a circumstellar disc in the outer Solar System, extending from the orbit of Neptune (at 30 AU) to approximately 50 AU from the Sun.

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Lambda, Λ, λ (uppercase Λ, lowercase λ; λάμ(β)δα lám(b)da) is the 11th letter of the Greek alphabet.

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List of gravitationally rounded objects of the Solar System

This is a list of gravitationally rounded objects of the Solar System, which are objects that have a rounded, ellipsoidal shape due to the forces of their own gravity (hydrostatic equilibrium).

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List of possible dwarf planets

It is estimated that there may be 200 dwarf planets in the Kuiper belt of the outer Solar System and possibly more than 10,000 in the region beyond.

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Lists of planets

The following are lists of planets.

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Lists of small Solar System bodies

This is a list of the lists of small Solar System bodies and dwarf planets.

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Lowell Observatory

Lowell Observatory is an astronomical observatory in Flagstaff, Arizona, United States.

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Makemake (minor-planet designation 136472 Makemake) is a dwarf planet and perhaps the largest Kuiper belt object in the classical population, with a diameter approximately two thirds that of Pluto.

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Mars is the fourth planet from the Sun and the second-smallest planet in the Solar System after Mercury.

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Mass is both a property of a physical body and a measure of its resistance to acceleration (a change in its state of motion) when a net force is applied.

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Mercury (planet)

Mercury is the smallest and innermost planet in the Solar System.

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Mesoplanets are planetary bodies with sizes smaller than Mercury but larger than Ceres.

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Michael E. Brown

Michael E. Brown (born June 5, 1965) is an American astronomer, who has been professor of planetary astronomy at the California Institute of Technology (Caltech) since 2003.

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Mimas (moon)

Mimas, also designated Saturn I, is a moon of Saturn which was discovered in 1789 by William Herschel.

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Miranda (moon)

Miranda, also designated Uranus V, is the smallest and innermost of Uranus's five round satellites.

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The Moon is an astronomical body that orbits planet Earth and is Earth's only permanent natural satellite.

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Moons of Haumea

The outer Solar System dwarf planet Haumea has two known moons, Hiʻiaka and Namaka, named after Hawaiian goddesses.

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Moons of Pluto

The dwarf planet Pluto has five moons down to a detection limit of about 1 km in diameter.

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Mu (letter)

Mu (uppercase Μ, lowercase μ; Ancient Greek μῦ, μι or μυ—both) or my is the 12th letter of the Greek alphabet.

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The National Aeronautics and Space Administration (NASA) is an independent agency of the executive branch of the United States federal government responsible for the civilian space program, as well as aeronautics and aerospace research.

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Natural satellite

A natural satellite or moon is, in the most common usage, an astronomical body that orbits a planet or minor planet (or sometimes another small Solar System body).

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Neptune is the eighth and farthest known planet from the Sun in the Solar System.

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New Horizons

New Horizons is an interplanetary space probe that was launched as a part of NASA's New Frontiers program.

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Oberon (moon)

Oberon, also designated, is the outermost major moon of the planet Uranus.

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Orbital eccentricity

The orbital eccentricity of an astronomical object is a parameter that determines the amount by which its orbit around another body deviates from a perfect circle.

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Orbital inclination

Orbital inclination measures the tilt of an object's orbit around a celestial body.

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Orbital period

The orbital period is the time a given astronomical object takes to complete one orbit around another object, and applies in astronomy usually to planets or asteroids orbiting the Sun, moons orbiting planets, exoplanets orbiting other stars, or binary stars.

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Orders of magnitude (mass)

To help compare different orders of magnitude, the following lists describe various mass levels between 10−40 kg and 1053 kg.

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Ottawa Citizen

The Ottawa Citizen is an English-language daily newspaper owned by Postmedia Network in Ottawa, Ontario, Canada.

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The Portable Document Format (PDF) is a file format developed in the 1990s to present documents, including text formatting and images, in a manner independent of application software, hardware, and operating systems.

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Phoebe (moon)

Phoebe (Greek: Φοίβη Phoíbē) is an irregular satellite of Saturn with a mean diameter of 213 km.

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The number is a mathematical constant.

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A planet is an astronomical body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has cleared its neighbouring region of planetesimals.

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Planetary system

A planetary system is a set of gravitationally bound non-stellar objects in or out of orbit around a star or star system.

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Planetesimals are solid objects thought to exist in protoplanetary disks and in debris disks.

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Planets beyond Neptune

Following the discovery of the planet Neptune in 1846, there was considerable speculation that another planet might exist beyond its orbit.

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Plasticity (physics)

In physics and materials science, plasticity describes the deformation of a (solid) material undergoing non-reversible changes of shape in response to applied forces.

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In astronomy, the plutinos are a dynamical group of trans-Neptunian objects in the outermost region of the Solar System that orbit in 2:3 mean-motion resonance with Neptune.

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Pluto (minor planet designation: 134340 Pluto) is a dwarf planet in the Kuiper belt, a ring of bodies beyond Neptune.

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A plutoid or ice dwarf is a trans-Neptunian dwarf planet, i.e. a body orbiting beyond Neptune that is massive enough to be rounded in shape.

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In geology, a pluton is a body of intrusive igneous rock (called a plutonic rock) that is crystallized from magma slowly cooling below the surface of the Earth.

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Resonant trans-Neptunian object

In astronomy, a resonant trans-Neptunian object is a trans-Neptunian object (TNO) in mean-motion orbital resonance with Neptune.

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Rhea (moon)

Rhea (Ῥέᾱ) is the second-largest moon of Saturn and the ninth-largest moon in the Solar System.

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Rheasilvia is the most prominent surface feature on the asteroid Vesta and is thought to be an impact crater.

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Rotation period

In astronomy, the rotation period of a celestial object is the time that it takes to complete one revolution around its axis of rotation relative to the background stars.

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Saturn is the sixth planet from the Sun and the second-largest in the Solar System, after Jupiter.

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Scattered disc

The scattered disc (or scattered disk) is a distant circumstellar disc in the Solar System that is sparsely populated by icy small solar system bodies, and are a subset of the broader family of trans-Neptunian objects.

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A shape is the form of an object or its external boundary, outline, or external surface, as opposed to other properties such as color, texture or material composition.

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Small Solar System body

A small Solar System body (SSSB) is an object in the Solar System that is neither a planet, nor a dwarf planet, nor a natural satellite.

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Solar System

The Solar SystemCapitalization of the name varies.

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In everyday use and in kinematics, the speed of an object is the magnitude of its velocity (the rate of change of its position); it is thus a scalar quantity.

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A spheroid, or ellipsoid of revolution, is a quadric surface obtained by rotating an ellipse about one of its principal axes; in other words, an ellipsoid with two equal semi-diameters.

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Steven Soter

Steven Soter is an astrophysicist currently holding the positions of scientist-in-residence for New York University's Environmental Studies Program and of Research Associate for the Department of Astrophysics at the American Museum of Natural History.

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Temperature is a physical quantity expressing hot and cold.

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Terrestrial planet

A terrestrial planet, telluric planet, or rocky planet is a planet that is composed primarily of silicate rocks or metals.

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Tethys (moon)

Tethys (or Saturn III) is a mid-sized moon of Saturn about across.

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Tidal heating

Tidal heating (also known as tidal working or tidal flexing) occurs through the tidal friction processes: orbital energy is dissipated as heat in either the surface ocean or interior of a planet or satellite.

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Tidal locking

Tidal locking (also called gravitational locking or captured rotation) occurs when the long-term interaction between a pair of co-orbiting astronomical bodies drives the rotation rate of at least one of them into the state where there is no more net transfer of angular momentum between this body (e.g. a planet) and its orbit around the second body (e.g. a star); this condition of "no net transfer" must be satisfied over the course of one orbit around the second body.

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Titan (moon)

Titan is the largest moon of Saturn.

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Titania (moon)

No description.

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Trans-Neptunian object

A trans-Neptunian object (TNO, also written transneptunian object) is any minor planet in the Solar System that orbits the Sun at a greater average distance (semi-major axis) than Neptune, 30 astronomical units (AU).

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Triton (moon)

Triton is the largest natural satellite of the planet Neptune, and the first Neptunian moon to be discovered.

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Umbriel (moon)

Umbriel is a moon of Uranus discovered on October 24, 1851, by William Lassell.

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Uranus is the seventh planet from the Sun.

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Veneneia is the second-largest crater on asteroid 4 Vesta, at 52°S latitude.

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Venus is the second planet from the Sun, orbiting it every 224.7 Earth days.

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2 Pallas

Pallas, minor-planet designation 2 Pallas, is the second asteroid to have been discovered (after Ceres), and is one of the largest asteroids in the Solar System.

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4 Vesta

Vesta, minor-planet designation 4 Vesta, is one of the largest objects in the asteroid belt, with a mean diameter of.

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50000 Quaoar

50000 Quaoar, provisional designation, is a non-resonant trans-Neptunian object (cubewano) and possibly a dwarf planet in the Kuiper belt, located in the outermost region of the Solar System.

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90377 Sedna

90377 Sedna is a large minor planet in the outer reaches of the Solar System that was,, at a distance of about 86 astronomical units (AU) from the Sun, about three times as far as Neptune.

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90482 Orcus

90482 Orcus, provisional designation, is a trans-Neptunian object from the Kuiper belt with a large moon, Vanth.

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Belt planet, Dwarf (astronomy), Dwarf Planet, Dwarf Planets, Dwarf planets, Dwarf-planet, Dwarfplanet, Planetary dwarf, Planette, Plutonic planet, Plutonic planets, Potato Radius, Potato radius, Solar system dwarf planets.


[1] https://en.wikipedia.org/wiki/Dwarf_planet

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