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Insights from the correlation of the preliminary Geologic and Mineralogic maps of Vesta from the Dawn mission data

Frigeri, A. and De Sanctis, M.C. and Ammannito, E. and Yingst, R. Aileen and Mest, S. and Garry, W.B. and Magni, G. and Palomba, E. and Petro, N.E. and Tosi, F. and Williams, D.A. and Zambon, F. and Jaumann, R. and Pieters, C. and Raymond, C.A. and Russell, C.T. (2012) Insights from the correlation of the preliminary Geologic and Mineralogic maps of Vesta from the Dawn mission data. In: Copernicus. EGU 2012, 22.04-27.04.2012, Wien, Österreich.

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Abstract

The Dawn mission to Vesta has greatly improved the quality and resolution of data available to explore the asteroid. Prior to the Dawn mission the best data available was the one from Hubble Space Telescope with a maximum resolution of 50 km per pixel. The survey phase of the mission has pushed spatial resolution up to about 100 meters per pixel by the Framing Camera on-board Dawn, and 700 meters per pixel for the VIR spectrometer, spanning the spectral range from the visible to infrared at 0.25-1 μm and 1-5 μm. The frames of the FC and VIR have been processed and mosaicked. A preliminary Geologic map has been produced by mapping units and structures over the FC mosaic and the DTM derived from stereo processing of visible imagery. We will present some examples of correlation between the preliminary geologic and VIR-derived mineralogic maps. The Dawn mission team is using Geographic Information System tools for locating frames and for data exchange among the team. The use of GIS tools and data formats significantly improves our ability to create and interpret geologic maps, and also improves the interoperability of high level data products among the instruments' team. VIR data have been synthesized into a series of spectral indicators that give indications on the mineralogical composition and the physical state of the surface. We ingested in GIS the the preliminary geologic map as units and structures and we projected the mosaics of spectral indicators in a common coordinate reference system. The first spectral indicators we started to look at were the Band Depth computed on pyroxene Band II and the Band Center also computed on Band II. The comparison of the preliminary geologic map and the mosaics of spectral indicators extracted from VIR data show promising aspects on both the geologic and mineralogic aspects. Geologic units are made up of bodies of rock that are interpreted to have been formed by a particular process or set of related processes over a discrete interval of time, so the morphology and the topography are the primary sources for the crafting of a geologic map. Mineralogy as interpreted from spectroscopy provides unique information in interpreting unit boundaries and the processes that formed those units. In particular, spectral indicators synthesize the complex methods of data reduction, making mineralogic measurements accessible to non-spectroscopists. This way, within a digital mapping context in GIS, including the spectral indicators in the stack of imagery and topographic layers enriches the observation possibilities of the geologic mapper. However, caution must be used to ensure that surface mineralogic expression are not misinterpreted as geologic units, and only the combined effort of geologic mappers and spectroscopists will develop good practices in the use of spectral indicators. We believe that the combined observation of image mosaics, topography and mineralogic parameters will greatly improve the interpretative process of geologic mapping and thus the quality of the next series of forthcoming geologic maps of Vesta. The authors gratefully acknowledge the support of the Dawn Instrument, Operations, and Science Teams. This work is supported by an Italian Space Agency (ASI) grant and by NASA through the Dawn project and a Dawn at Vesta Participating Scientist grant.

Item URL in elib:https://elib.dlr.de/80585/
Document Type:Conference or Workshop Item (UNSPECIFIED)
Title:Insights from the correlation of the preliminary Geologic and Mineralogic maps of Vesta from the Dawn mission data
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Frigeri, A.National Institute of Astrophysics, Rome, ItalyUNSPECIFIED
De Sanctis, M.C.Istituto Nazionale di Astrofisica, Rome, Italy.UNSPECIFIED
Ammannito, E.INAF, Istituto di Fisica Dello Spazio Interplanetario, Roma, ItalyUNSPECIFIED
Yingst, R. AileenPlanetary Science Institute, Tucson, AZ, United States.UNSPECIFIED
Mest, S.Planetary Science Institute, 1700 E. Ft. Lowell, Suite 106, Tucson, AZ, 85719, USAUNSPECIFIED
Garry, W.B.PSI, Tucson, AZ, United States.UNSPECIFIED
Magni, G.INAF/Instituto di Astrofisica Spaziale e Fisica Cosmica, Rome, ItalyUNSPECIFIED
Palomba, E.Institute for Interplanetary Space Physics - INAF, Rome, ItalyUNSPECIFIED
Petro, N.E.NASA Goddard Space Flight Center, Greenbelt, MD, United States.UNSPECIFIED
Tosi, F.INAF-IASF Istituto di Astrofisica Spaziale e Fisica Cosmica, Roma ItalyUNSPECIFIED
Williams, D.A.Arizona State UniversityUNSPECIFIED
Zambon, F.INAF-IAPS, Via del Fosso del Cavaliere 100, I-00133 Rome, ItalyUNSPECIFIED
Jaumann, R.ralf.jaumann (at) dlr.deUNSPECIFIED
Pieters, C.Brown University, Providence, RI, USAUNSPECIFIED
Raymond, C.A.Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109-8099, USAUNSPECIFIED
Russell, C.T.Institute of Geophysics, University of California, Los Angeles, Los Angeles, CA 90095UNSPECIFIED
Date:April 2012
Journal or Publication Title:Copernicus
Open Access:No
In DOAJ:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Vesta, Dawn, Mineralogy, Geology
Event Title:EGU 2012
Event Location:Wien, Österreich
Event Type:international Conference
Event Dates:22.04-27.04.2012
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Projekt DAWN
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Geology
Deposited By: Aydin, Zeynep
Deposited On:14 Jan 2013 06:57
Last Modified:12 Dec 2013 21:58

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