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[7] [8] For a more complete list, see List of Solar System objects by size. The inner asteroid belt (defined as the region interior to the 3:1 Kirkwood gap at 2.50 AU) has few large asteroids. Of those in the above list, only 4 Vesta , 19 Fortuna , 6 Hebe , 7 Iris and 9 Metis orbit there.
This list includes few examples since there are about 589 asteroids in the asteroid belt with a measured radius between 20 and 49 km. [171] Many thousands of objects of this size range have yet to be discovered in the trans-Neptunian region.
This asteroid belt is also called the main asteroid belt or main belt to distinguish it from other asteroid populations in the Solar System. [ 1 ] The asteroid belt is the smallest and innermost known circumstellar disc in the Solar System.
The four largest asteroids constitute half the mass of the asteroid belt. Ceres is the only asteroid that appears to have a plastic shape under its own gravity and hence the only one that is a dwarf planet. [74] It has a much higher absolute magnitude than the other asteroids, of around 3.32, [75] and may possess a surface layer of ice. [76]
42 of the largest objects in the asteroid belt. If possible, asteroids should always be placed into one of the numerous sub-categories, in line with the category information given in the minor-planet catalog. Used sources: Small Body Data Ferret (Nesvorný) and AstDys (Milani and Knežević).
C. List of asteroid close approaches to Earth in 2011; List of asteroid close approaches to Earth in 2012; List of asteroid close approaches to Earth in 2013
Outer asteroid belt between the 5:2 and 2:1 Jupiter orbital resonances. The largest member is 10 Hygiea. This group is apparently split into the: Main-belt IIIa asteroids which have a semi-major axis between 2.82 AU and 3.03 AU, an eccentricity less than .35, and an inclination less than 30°.
The asteroid and comet belts orbit the Sun from the inner rocky planets into outer parts of the Solar System, interstellar space. [16] [17] [18] An astronomical unit, or AU, is the distance from Earth to the Sun, which is approximately 150 billion meters (93 million miles). [19]