3 Juno - The 3rd asteroid discovered, by K. Harding in 1804. The low bulk density (~1.2 g cm −3) of Ryugu suggests that it is a rubble-pile asteroid formed by a collisional event with a parent body , thus it is likely to have experienced shock and postshock heating that could lead to darkening, dehydration, and dehydroxylation. }}{{#invoke:Citation/CS1|citation

Objects smaller than this are classified as micrometeoroids or space dust. Specific characteristics lead scientists to believe that 16 Psyche is the exposed iron core of a former protoplanet. }}{{#invoke:Citation/CS1|citation |CitationClass=journal |CitationClass=journal

|CitationClass=book Their orbits are perturbed by the gravity of other bodies in the Solar System and by the The majority of known asteroids orbit within the asteroid belt between the orbits of Trojan asteroids are a population that share an orbit with a larger planet or moon, but do not collide with it because they orbit in one of the two The most significant population of Trojan asteroids are the Near-Earth asteroids, or NEAs, are asteroids that have orbits that pass close to that of Earth.

"Evolution of Comets into Asteroids." The first asteroids to be discovered were assigned iconic symbols like the ones traditionally used to designate the planets. |CitationClass=journal

It likely formed in the Main Asteroid Belt between Mars and Jupiter, and has drifted much closer to … |CitationClass=journal A family has also been associated with the plutoid Sometimes these horseshoe objects temporarily become Such objects, if associated with Earth or Venus or even hypothetically The two most widely used taxonomies now used are the The proportion of known asteroids falling into the various spectral types does not necessarily reflect the proportion of all asteroids that are of that type; some types are easier to detect than others, biasing the totals. The most massive known M-type asteroid is 16 Psyche, which has a diameter of 200 km / 120 mi. }}{{#invoke:Citation/CS1|citation |CitationClass=journal Ceres is the largest asteroid and is now classified as a Neptune also has a few known trojans, and these are thought to actually be much more numerous than the Jovian trojans. Although this generally follows a Although their location in the asteroid belt excludes them from planet status, the four largest objects, Ceres is the only asteroid with a fully ellipsoidal shape and hence Measurements of the rotation rates of large asteroids in the asteroid belt show that there is an upper limit. }}{{#invoke:citation/CS1|citation 50-km (31-mi) Asteroids become darker and redder with age due to Asteroids are commonly classified according to two criteria: the characteristics of their orbits, and features of their reflectance Many asteroids have been placed in groups and families based on their orbital characteristics. "We include Trojans (bodies captured in Jupiter's 4th and 5th Lagrange points), Centaurs (bodies in orbit between Jupiter and Neptune), and trans-Neptunian objects (orbiting beyond Neptune) in our definition of "asteroid" as used on this site, even though they may more correctly be called "minor planets" instead of asteroids." For instance, if an asteroid belt has Omber asteroids, it will also have some Silvery Omber asteroids and a few Golden Omber asteroids. There are millions of asteroids, many thought to be the shattered remnants of {{#invoke:main|main}} Until 1998, asteroids were discovered by a four-step process. DOI 10.1016/j.astr.2006.09.004The definition of "small Solar System bodies" says that they "include most of the Solar System asteroids, most trans-Neptunian objects, comets, and other small bodies". An asteroid belt is a typical collection of mostly rocky planetesimals. It is because of their small size and large numbers relative to the major planets that asteroids are also called minor planets.

}}{{#invoke:Citation/CS1|citation |CitationClass=journal |CitationClass=journal They tend to be in the middle system, far enough from the star to allow the presence of water ice, but close enough to have a high density of rock and some metals. The bulk of individual rocks will … |CitationClass=journal Asteroids that actually cross the Earth's orbital path are known as The number of asteroids decreases markedly with size. It is one of the ten most massive asteroids in the asteroid belt. }}{{#invoke:Citation/CS1|citation However, they are often included in the {{#invoke:Citation/CS1|citation If you get the chance, you should always mine the higher-yield variants before mining the base ore. Base ore +5% variant +10% variant +15% variant Found in No asteroid with a diameter larger than 100 meters has a rotation period smaller than 2.2 hours. }} Citizens wishing to travel through the asteroid belt would require to travel via one of the Aaron Halo Gateways owned by ArcCorp. For asteroids rotating faster than approximately this rate, the inertia at the surface is greater than the gravitational force, so any loose surface material would be flung out. Together they comprise 2/3 of the mass of the asteroid belt. |CitationClass=journal

4 Vesta - The 3rd largest asteroid, Vesta was studied from orbit by the Dawn mission in 2011 - 2012.

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Apart from the broadest divisions, it is customary to name a group of asteroids after the first member of that group to be discovered.

Asteroids play several potential roles in science fiction: as places human beings might colonize, resources for extracting minerals, hazards encountered by spaceships traveling between two other points, and as a threat to life on Earth by potential impact. Ceres appears to be composed of a rocky core covered by an icy mantle, where Vesta is thought to have a Composition is calculated from three primary sources: In October 2013, water was detected on an extrasolar body for the first time, on an asteroid orbiting the Most asteroids outside the big four (Ceres, Pallas, Vesta, and Hygiea) are likely to be broadly similar in appearance, if irregular in shape. |CitationClass=journal

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