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- W2984123314 abstract "Although S-type asteroids are the most common among the inner-part main belt asteroids as well as near-Earth asteroids, reddened reflectance spectra and derived mineralogy of S-type asteroids are different from those of ordinary chondrites, the most common meteorites. Space weathering is thought to be able to explain these spectral mismatches between asteroid types and meteorite classes. Recent asteroid surveys suggest a strong link between Stype asteroids and ordinary chondrites. Multispectral observation of Ida by Galileo spacecraft showed that relatively fresh surface such as crater interiors and ejecta have reflectance like ordinary chondrites. Moreover NEAR-Shoemaker mission revealed, thanks to X-ray and near-infrared spectrometer measurements, an ordinary chondrite composition of 433 Eros despite a reddened S-type spectrum, suggesting once again that the space weathering has altered the surface optical properties. The detailed mechanism of space weathering has been remained to be unsolved until recently, when the laboratory experiments using high-energy pulse laser irradiation showed that the reflectance change forming S-type spectra is caused by formation of nanophase iron particles within vapourdeposited rim around regolith particles. It was suggested that the degree of space weathering, i.e., redness of spectral slope, can be used to discuss the age of asteroids. And recently relation between the color and age of S asteroid groups are found through Sloan Digital Sky Survey project. Here we have an excellent target. Using numerical integration of asteroid orbits, Nesvorny et al. recently revealed a new-born group of asteroids named Karin cluster group, which is thought to be remnants of a recent breakup of only 5.8 million years ago. In the present study, we observed the brightest asteroids 832 Karin in this group in order to investigate whether the new asteroid really has fresh and unreddened surface." @default.
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- W2984123314 date "2004-11-01" @default.
- W2984123314 modified "2023-10-15" @default.
- W2984123314 title "Mature and Fresh Surfaces on New-Born Asteroid Karin" @default.
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