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# 9 Metis

9 Metis is one of the larger main-belt asteroids. [1]

## Andrew Graham (astronomer)

Andrew Graham (April 8, 1815 – November 5, 1908), born in County Fermanagh, Ireland, was an Irish astronomer/computer.

## 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.

## Asteroid family

An asteroid family is a population of asteroids that share similar proper orbital elements, such as semimajor axis, eccentricity, and orbital inclination.

## 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.

## Chord (astronomy)

In the field of astronomy the term chord typically refers to a line crossing an object which is formed during an occultation event.

## Ecliptic coordinate system

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

## Elongation (astronomy)

In astronomy, a planet's elongation is the angle between the Sun and the planet, with Earth as the reference point.

## Equatorial coordinate system

The equatorial coordinate system is a widely used celestial coordinate system used to specify the positions of celestial objects.

## 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.

## 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.

## Inner moon

In astronomy, an inner moon is a natural satellite following a prograde, low-inclination orbit inwards of the large satellites of the parent planet.

## Iron

Iron is a chemical element with symbol Fe (from ferrum) and atomic number 26.

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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.

## Jupiter

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

## Kelvin

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

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## List of exceptional asteroids

The following is a collection of lists of exceptional asteroids in the Solar System.

## Magnitude (astronomy)

In astronomy, magnitude is the logarithmic measure of the brightness of an object, measured in a specific wavelength or passband, usually in the visible or near-infrared spectrum.

## Markree Observatory

Markree Observatory was an astronomical observatory in County Sligo, Ireland.

## Metal

A metal (from Greek μέταλλον métallon, "mine, quarry, metal") is a material (an element, compound, or alloy) that is typically hard, opaque, shiny, and has good electrical and thermal conductivity.

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## Metis (moon)

Metis (Μήτις), also known as, is the innermost moon of Jupiter.

## Metis (mythology)

Metis (Μῆτις, "wisdom," "skill," or "craft"), in ancient Greek religion, was of the Titan generation and, like several primordial figures, an Oceanid, in the sense that Metis was born of Oceanus and his sister Tethys, of an earlier age than Zeus and his siblings.

## 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.

## Nickel

Nickel is a chemical element with symbol Ni and atomic number 28.

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## Oceanid

In Greek mythology and, later, Roman mythology, the Oceanids (κεανίδες, pl.) are sea nymphs who were the three thousand daughters of the Titans Oceanus and Tethys.

## Oceanus

Oceanus (Ὠκεανός Ōkeanós) was a divine figure in classical antiquity, believed by the ancient Greeks and Romans to be the divine personification of the sea, an enormous river encircling the world.

## Olivine

The mineral olivine is a magnesium iron silicate with the formula (Mg+2, Fe+2)2SiO4.

## 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.

## Portable Document Format

Portable Document Format (PDF) is a file format used to present documents in a manner independent of application software, hardware and operating systems.

## Proper orbital elements

The proper orbital elements of an orbit are constants of motion of an object in space that remain practically unchanged over an astronomically long timescale.

## S-type asteroid

S-type asteroids, or silicaceous asteroids, are of a stony composition, hence the name.

## Silicate

A silicate is a compound containing an anionic silicon compound.

## Tethys (mythology)

In Greek mythology, Tethys (Τηθύς), daughter of Uranus and Gaia, was an archaic Titaness and aquatic sea goddess, invoked in classical Greek poetry, but not venerated in cult.

## Titan (mythology)

In Classical Greek mythology, the Titans (Greek: Τῑτάν Tītán; plural: Τῑτᾶνες Tītânes) and Titanesses (Greek: Τῑτᾱνίς Tītānís; plural: Τῑτᾱνίδες Tītānídes) were members of the second order of divine beings, descending from the primordial deities and preceding the Olympian deities.

## Year

A year is the orbital period of the Earth moving in its orbit around the Sun.

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## 113 Amalthea

113 Amalthea is a fairly typical rocky main-belt asteroid orbiting in the inner regions of the belt.

## 17 Thetis

17 Thetis is a large main-belt asteroid that was discovered by R. Luther on April 17, 1852.

## 4 Vesta

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

## References

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