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# 6 Hebe

6 Hebe is a large main-belt asteroid, containing around half a percent of the mass of the belt. [1]

## Apparent magnitude

The apparent magnitude of a celestial object is a number that is a measure of its brightness as seen by an observer on Earth.

## Asteroid

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

## Asteroid belt

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

## Astronomical unit

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

## 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.

## Carl Friedrich Gauss

Johann Carl Friedrich Gauss (Gauß; Carolus Fridericus Gauss; 30 April 177723 February 1855) was a German mathematician and physicist who made significant contributions to many fields, including algebra, analysis, astronomy, differential geometry, electrostatics, geodesy, geophysics, magnetic fields, matrix theory, mechanics, number theory, optics and statistics.

## 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.

## Chondrite

Chondrites are stony (non-metallic) meteorites that have not been modified due to melting or differentiation of the parent body.

## Ecliptic coordinate system

The ecliptic coordinate system is a celestial coordinate system commonly used for representing the apparent positions and orbits of Solar System objects.

## Gamma Ceti

Gamma Ceti (γ Ceti, abbreviated Gam Cet, γ Cet) is a triple star system in the equatorial constellation of Cetus.

## H chondrite

The H type ordinary chondrites are the most common type of meteorite, accounting for approximately 40% of all those catalogued, 46% of the ordinary chondrites, and 44% of the chondrites.

## Hebe (mythology)

Hebe (Ἥβη) in ancient Greek religion, is the goddess of youth (Roman equivalent: Juventas).

## Heebie-jeebies (idiom)

Heebie-jeebies or Heebie Jeebies is an American English idiom used to describe a particular type of anxiety usually related to a certain person or place.

## IIE iron meteorite

The iron meteorites of the IIE chemical type are octahedrites of various coarseness, most of which contain numerous inclusions of recrystallized stony silicates.

## Iron–nickel alloy

An iron–nickel alloy or nickel–iron alloy, abbreviated FeNi or NiFe, is a group of alloys consisting primarily of the elements nickel (Ni) and iron (Fe).

## Isotope

Isotopes are variants of a particular chemical element which differ in neutron number.

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## Julian day

Julian day is the continuous count of days since the beginning of the Julian Period and is used primarily by astronomers.

## Julian year (astronomy)

In astronomy, a Julian year (symbol: a) is a unit of measurement of time defined as exactly 365.25 days of SI seconds each.

## Karl Ludwig Hencke

Karl Ludwig Hencke (8 April 1793 – 21 September 1866) was a German amateur astronomer and discoverer of minor planets.

## Kelvin

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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## Kirkwood gap

A Kirkwood gap is a gap or dip in the distribution of the semi-major axes (or equivalently of the orbital periods) of the orbits of main-belt asteroids.

## Light curve

In astronomy, a light curve is a graph of light intensity of a celestial object or region, as a function of time.

## Mars

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

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## Meteorite

A meteorite is a solid piece of debris from an object, such as a comet, asteroid, or meteoroid, that originates in outer space and survives its passage through the atmosphere to reach the surface of a planet or moon.

## Moon

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

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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).

## Occultation

An occultation is an event that occurs when one object is hidden by another object that passes between it and the observer.

## Orbital inclination

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

## Ordinary chondrite

The ordinary chondrites (sometimes called the O chondrites) are a class of stony chondritic meteorites.

## Planetary differentiation

In planetary science, planetary differentiation is the process of separating out different constituents of a planetary body as a consequence of their physical or chemical behaviour, where the body develops into compositionally distinct layers; the denser materials of a planet sink to the center, while less dense materials rise to the surface, generally in a magma ocean.

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).

## Rubble pile

In astronomy, a rubble pile is a celestial body that is not a monolith, consisting instead of numerous pieces of rock that have coalesced under the influence of gravity.

## S-type asteroid

S-type asteroids are asteroids with a spectral type that is indicative of a silicaceous (i.e. stony) mineralogical composition, hence the name.

## Secular resonance

A secular resonance is a type of orbital resonance of two bodies with a synchronized precession.

## Silicate

In chemistry, a silicate is any member of a family of anions consisting of silicon and oxygen, usually with the general formula, where 0 ≤ x Silicate anions are often large polymeric molecules with an extense variety of structures, including chains and rings (as in polymeric metasilicate), double chains (as in, and sheets (as in. In geology and astronomy, the term silicate is used to mean silicate minerals, ionic solids with silicate anions; as well as rock types that consist predominantly of such minerals. In that context, the term also includes the non-ionic compound silicon dioxide (silica, quartz), which would correspond to x.

## Titan (moon)

Titan is the largest moon of Saturn.

## 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.

## 243 Ida

243 Ida is an asteroid in the Koronis family of the asteroid belt.

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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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## 5 Astraea

5 Astraea is a large asteroid from the asteroid belt.

## 7 Iris

7 Iris is a large main-belt asteroid orbiting the Sun between Mars and Jupiter.

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## References

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