Hilda asteroid and Retrograde and prograde motion

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Difference between Hilda asteroid and Retrograde and prograde motion

Hilda asteroid vs. Retrograde and prograde motion

The Hilda asteroids (adj. Hildian) are a dynamical group of asteroids in a 3:2 orbital resonance with Jupiter. Retrograde motion in astronomy is, in general, orbital or rotational motion of an object in the direction opposite the rotation of its primary, that is the central object (right figure).

Asteroid

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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Comet

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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Ecliptic

The ecliptic is the circular path on the celestial sphere that the Sun follows over the course of a year; it is the basis of the ecliptic coordinate system.

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Jupiter

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

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Monthly Notices of the Royal Astronomical Society

Monthly Notices of the Royal Astronomical Society (MNRAS) is a peer-reviewed scientific journal covering research in astronomy and astrophysics.

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Near-Earth object

A near-Earth object (NEO) is any small Solar System body whose orbit can bring it into proximity with Earth.

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Orbit

In physics, an orbit is the gravitationally curved trajectory of an object, such as the trajectory of a planet around a star or a natural satellite around a planet.

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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 resonance

In celestial mechanics, an orbital resonance occurs when orbiting bodies exert a regular, periodic gravitational influence on each other, usually because their orbital periods are related by a ratio of small integers.

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Perihelion and aphelion

The perihelion of any orbit of a celestial body about the Sun is the point where the body comes nearest to the Sun.

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Planet

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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Sun

The Sun is the star at the center of the Solar System.

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