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Global view of the bright material on vesta
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Schroeder, S. Tosi, F. Capaccioni, F. Raymond, C. A. Nathues, A. Blewett, D. T. Capria, M. T. Li, J.-Y. Palomba, E. Frigeri, A. Longobardo, A. Ammannito, E. Zambon, F. Russell, C. T. Fonte, S. Mittlefehldt, D. W. DeSanctis, C. Pieters, C. |
| Copyright Year | 2014 |
| Description | At 525 km in mean diameter, Vesta is the second-most massive and one of the brightest asteroids of the main-belt. Here we give a global view of the bright material (BM) units on Vesta. We classified the BMs according to the normal visual albedo. The global albedo map of Vesta allows to be divided the surface into three principal types of terrains: bright regions, dark regions and intermediate regions. The distribution of bright regions is not uniform. The mid-southern latitudes contain the most bright areas, while the northern hemisphere is poor in bright regions. The analysis of the spectral parameters and the normal visual albedo show a dependence between albedo and the strength (depth) of ferrous iron absorption bands, strong bands correspond with high albedo units. Vesta's average albedo is 0.38, but there are bright material whose albedo can exceed 0.50. Only the E-Type asteroids have albedos comparable to those of the BMs on Vesta. The Dawn mission observed a large fraction of Vesta's surface at high spatial resolution, allowing a detailed study of the morphology and mineralogy of it. In particular, reflectance spectra provided by the Visible and InfraRed spectrometer (VIR), confirmed that Vesta's mineralogy is dominated by pyroxenes. All Vesta spectra show two strong absorption bands at approx 0.9 and 1.9 micron, typical of the pyroxenes and associated with the howardite, eucrite and diogenite (HED) meteorites. |
| File Size | 822100 |
| Page Count | 2 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20140005769 |
| Archival Resource Key | ark:/13960/t8cg4qc3t |
| Language | English |
| Publisher Date | 2014-02-03 |
| Access Restriction | Open |
| Subject Keyword | Lunar And Planetary Science And Exploration Pyroxenes Vesta Asteroid Albedo Brightness Infrared Spectrometers Mineralogy Meteoritic Composition Brightness Distribution Reflectance Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
