A-type asteroids are relatively uncommon inner-belt
A-type asteroids are so rare that as of 2005 only 17 had been discovered.
External links
* [http://www.lpi.usra.edu/meetings/lpsc2005/pdf/1375.pdf A technical report on A-Type Asteroids]
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P-type asteroid — P type asteroids have low albedo and a featureless reddish electromagnetic spectrum. It has been suggested that they have a composition of organic rich silicates, carbon and anhydrous silicates, possibly with water ice in their interior. P type… … Wikipedia
C-type asteroid — C type asteroids are carbonaceous asteroids. They are the most common variety forming around 75% of known asteroidsFact|date=July 2008, and an even higher percentage in the outer part of the belt beyond 2.7 AU, which is dominated by this asteroid … Wikipedia
S-type asteroid — S type asteroids are of a silicaceous ( stony ) composition, hence the name. Approximately 17% of asteroids are of this type, making it the second most common after the C type. CharacteristicsS types are moderately bright (with an albedo of 0.10… … Wikipedia
E-type asteroid — E type asteroids are asteroids thought to have enstatite achondrite surfaces. They form a large proportion of asteroids inward of the main belt known as Hungaria asteroids,cite book |author=McSween, Harry Y. |authorlink= |editor= |others=… … Wikipedia
D-type asteroid — D type asteroids have a very low albedo and a featureless reddish electromagnetic spectrum[citation needed]. It has been suggested that they have a composition of organic rich silicates, carbon and anhydrous silicates, possibly with water ice in… … Wikipedia
M-type asteroid — M type asteroids are asteroids of unknown composition; they are moderately bright (albedo 0.1 ndash;0.2). Some, but not all, are made of nickel iron, either pure or mixed with small amounts of stone. These are thought to be pieces of the metallic … Wikipedia
X-type asteroid — The X group of asteroids collects together several types with similar spectra, but probably quite different compositions.Tholen classificationIn the Tholen classification the X group contains the types: * E type * M type, the largest grouping * P … Wikipedia
K-type asteroid — K type asteroids are relatively uncommon asteroids with a moderately reddish spectrum shortwards of 0.75 mu;m, and a slight bluish trend longwards of this. They have a low albedo. Their spectrum resembles that of CV and CO meteorites. These… … Wikipedia
F-type asteroid — F type asteroids are a relatively uncommon type of carbonaceous asteroid, falling into the wider C group. CharacteristicsGenerally similar to the B type asteroids, but lacking the water absorption feature around 3 μm indicative of hydrated… … Wikipedia
J-type asteroid — J type asteroids are asteroids with spectra similar to that of Diogenite meteorites and so, presumably, to the deeper layers of the crust of 4 Vesta. Their spectra are rather similar to that of the V type asteroids but have a particularly strong… … Wikipedia
R-type asteroid — R type asteroids are moderately bright, relatively uncommon inner belt asteroids that are spectrally intermediate between the V and A type asteroids. The spectrum shows distinct olivine and pyroxene features at 1 and 2 micrometres, with a… … Wikipedia
