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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 (m) of a celestial object is a measure of its brightness as seen by an observer on Earth, adjusted to the value it would have in the absence of the atmosphere.

## Asteroid

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

## Asteroid belt

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

## Astronomical unit

The astronomical unit (symbol au, AU or ua) is a unit of length, roughly the distance from the 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 who contributed significantly to many fields, including number theory, algebra, statistics, analysis, differential geometry, geodesy, geophysics, mechanics, electrostatics, astronomy, matrix theory, and optics.

## Ceres (dwarf planet)

Ceres (minor-planet designation: 1 Ceres) is the largest object in the asteroid belt, which lies between the orbits of Mars and Jupiter.

## 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 positions and orbits of Solar System objects.

## Gamma Ceti

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

## 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.

## Geometric mean

In mathematics, the geometric mean is a type of mean or average, which indicates the central tendency or typical value of a set of numbers by using the product of their values (as opposed to the arithmetic mean which uses their sum).

## 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)

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

## 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 that mostly consist of the elements nickel (Ni) and iron (Fe).

## Isotope

Isotopes are variants of a particular chemical element which differ in neutron number, although all isotopes of a given element have the same number of protons in each atom.

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## Julian day

Julian day is the continuous count of days since the beginning of the Julian Period 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.

## Kelvin

The kelvin is a unit of measure for temperature based upon an absolute scale.

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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.

## 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 a source such as an asteroid or a comet, which originates in outer space and survives its impact with the Earth's surface.

## Moon

The Moon (in Greek: Selene, in Latin: Luna) is Earth's only natural satellite.

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## Natural satellite

A natural satellite or moon is a celestial body that orbits another body (a planet, dwarf planet, or small Solar System body), which is called its primary, and that is not artificial.

## 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 is the angle between a reference plane and the orbital plane or axis of direction of an object in orbit around another object.

## 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.

Retrograde motion is motion in the direction opposite to the movement of something else and the contrary of direct or prograde motion.

## Rubble pile

In astronomy, a rubble pile is an object 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, or silicaceous asteroids, are of a stony composition, hence the name.

## Secular resonance

A secular resonance is a type of orbital resonance.

## Silicate

A silicate is a compound containing an anionic silicon compound.

## Titan (moon)

Titan (or Saturn VI) 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 it is one of the largest asteroids in the Solar System.

## 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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