PROVISIONAL DESIGNATION OF ASTEROIDS

PROVISIONAL DESIGNATION OF ASTEROIDS

Guide of PROVISIONAL DESIGNATION OF ASTEROIDS

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Asteroid - Wikipedia, the free encyclopedia
Encyclopedia article covers history, groups of asteroids, spectral types. Tables of largest and notable asteroids.

In our, asteroids are the best known class of (or planetoid )

The vast majority of the asteroids are found within the main, with orbits between those of and

It is thought that asteroids are remnants of the, and in this region the incorporation of protoplanetary remnants into the planets was prevented by large gravitational perturbations induced by during the formative period of the solar system

Some asteroids have

Contents [] Asteroids in the solar system Left to right:, Earth's

Hundreds of thousands of asteroids have been discovered within the solar system and the present rate of discovery is about 5000 per month

Current estimates put the total number of asteroids above 1 km in diameter in the solar system to be between 1.1 and 1.9 million

Two other large inner solar system belt asteroids are and ; both have diameters of ~500 km

The mass of all the asteroids of the Main Belt is estimated to be about 3.0-3.6×10 21 & kg , or about 4% of the mass of our moon

Adding in the next three most massive asteroids, (9%), (7%), and (3%), bring this figure up to 51%; while the three after that, (1.2%), (1.0%), and (0.9%), only add another 3% to the total mass



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Asteroid (and Comet) groups
Graphs and animations showing major asteroid groups and families.

Asteroids positions are computed for Apr

There are three general representations of the groups below: views of the solar system with respect to an external observer, animations showing the particular groups individually, and positions of asteroids in an orbital elements space, respectively

with asteroids coded by taxonomical classes , with objects with objects without curves with objects with objects Inner solar system - views from outside Two groups at these views have specific distribution in space - Trojans and Hilda group

Trojan asteroids lie in regions around Jupiter-Sun Lagrangian points, 60° ahead and behind of Jupiter

Hilda asteroids are in a 3:2 resonance of mean motion with Jupiter (that means the orbital period of asteroids and that of Jupiter have ratio of 2:3)

Near-Earth asteroids - views from outside Top view for the next two years

absolute magnitude Near-Earth Asteroids Note the observational bias towards larger objects at farther distances from the Sun (at 'All objects' and 'q vs

When showing the inclinations between asteroids' and Jupiter's orbits (i_J) instead of inclinations between asteroids' orbits and ecliptic (i) the 'wave' disappear

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PROVISIONAL DESIGNATION OF ASTEROIDS ?

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Asteroids with satellites
Lists of known or suspected asteroids with satellites. Also history, graphs, links.

Asteroids with Satellites by Wm

These systems include the following: 28 near-Earth asteroids, 5 Mars crossing asteroids, 38 main-belt asteroids (one with two satellites), 2 Jupiter Trojan asteroids, and 24 trans-Neptunian objects (one with two satellites) (not counting Pluto)

History: The first observations purporting to reveal asteroid satellites were lightcurve measurements during stellar occultations by asteroids, such as those of (6) Hebe in 1977 and (532) Herculina in 1978

Lightcurve measurements have been analyzed to indicate the signature of eclipsing binaries for several near-Earth asteroids

Near-Earth objects: The near-Earth binary asteroids include 6 Atens, 15 Apollos, and 7 Amors

These near-Earth asteroids are all close binaries

Many other near-Earth asteroids have high rotation rates--close to the limit where fission will occur--and a few other such objects are double-lobed, like contact binaries

Together, the evidence implies that binary near-Earth asteroids may be common

Main belt objects: The companions of main-belt asteroids discovered to date show a wider variety both in terms of separations between components and in terms of relative sizes


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The full text in English.


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