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Vesta's elemental composition
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Feldman, W. C. Raymond, C. A. Lawrence, D. J. Toplis, M. J. McCoy, T. J. Prettyman, T. H. Yamashita, N. Beck, A. W. Russell, C. T. Titus, T. N. Mittlefehldt, D. W. McSween, H. Y. Peplowski, P. N. Reedy, R. C. |
| Copyright Year | 2014 |
| Description | Many lines of evidence (e.g. common geochemistry, chronology, O-isotope trends, and the presence of different HED rock types in polymict breccias) indicate that the howardite, eucrite, and diogenite (HED) meteorites originated from a single parent body. Meteorite studies show that this protoplanet underwent igneous differentiation to form a metallic core, an ultramafic mantle, and a basaltic crust. A spectroscopic match between the HEDs and 4 Vesta along with a plausible mechanism for their transfer to Earth, perhaps as chips off V-type asteroids ejected from Vesta's southern impact basin, supports the consensus view that many of these achondritic meteorites are samples of Vesta's crust and upper mantle. The HED-Vesta connection was put to the test by the NASA Dawn mission, which spent a year in close proximity to Vesta. Measurements by Dawn's three instruments, redundant Framing Cameras (FC), a Visible-InfraRed (VIR) spectrometer, and a Gamma Ray and Neutron Detector (GRaND), along with radio science have strengthened the link. Gravity measurements by Dawn are consistent with a differentiated, silicate body, with a dense Fe-rich core. The range of pyroxene compositions determined by VIR overlaps that of the howardites. Elemental abundances determined by nuclear spectroscopy are also consistent with HED-compositions. Observations by GRaND provided a new view of Vesta inaccessible by telescopic observations. Here, we summarize the results of Dawn's geochemical investigation of Vesta and their implications. |
| File Size | 343915 |
| Page Count | 2 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20140012596 |
| Archival Resource Key | ark:/13960/t0kt1ps09 |
| Language | English |
| Publisher Date | 2014-02-03 |
| Access Restriction | Open |
| Subject Keyword | Lunar And Planetary Science And Exploration Spectroscopy Vesta Asteroid Infrared Spectrometers Meteoritic Composition Geochemistry Meteorite Parent Bodies Framing Cameras Achondrites Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
