elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Impressum | Datenschutz | Kontakt | English
Schriftgröße: [-] Text [+]

Mineralogical Mapping of Quadrangle Av-12 (sextilia) on 4 Vesta

Stephan, K. und Jaumann, R. und Tosi, F. und Titus, Timothy N. und De sanctis, M.C. und Krohn, Katrin und Matz, Klaus-Dieter und Roatsch, Thomas und Preusker, Frank und Le Corre, L. und Reddy, V. und Russell, C.T. und Raymond, C.A. (2012) Mineralogical Mapping of Quadrangle Av-12 (sextilia) on 4 Vesta. In: Copernicus. EGU 2012, 2012-04-22 - 2012-04-27, Wien, Österreich.

[img]
Vorschau
PDF
43kB

Kurzfassung

Since the arrival of the Dawn spacecraft at Vesta the Visible and InfraRed Imaging Spectrometer (VIR) has acquired hyperspectral images of Vesta's surface in the wavelength range from 0.25 to 5.1µm. As part of the analysis of Vesta's surface composition a series of 15 quadrangle maps have been produced showing the results derived from the spectroscopic analysis of the VIR data. We present the results of the spectroscopic analysis achieved for the quadrangle Av-12 (Sextilia), which covers Vesta's surface between 21°S - 66° S and 90° - 180° E. The region is dominated by the impact crater Sextila (~39°S/146°E) with its very well preserved continuous ejecta blanket, as well as two huge tectonic scarps (Argonium and Matronalia Rupes), which define the margin of Vesta's southern impact basin Rheasilvia (Krohn et al., 2012, this session). VIR spectra show clear evidence of Vesta's basaltic surface composition. However, significant variability in slope, strength and wavelength position of the prominent pyroxene absorptions near 0.9 and 1.9µm indicate multiple physical surface processes (De Sanctis et al., this session). Based on the combination of the visible albedo, spectral parameters like the depths of the pyroxene absorptions as well as color ratio composites using the VIR channels centering at 749nm/438nm (Red), 749nm/917nm (Green) and 438/749nm (Blue) Vesta's surface can be divided into different terrain types, which are mostly related to specific geological units or morphological surface features (De Sanctis et al., this session). Among these terrain types the quadrangle Av-12 can be divided very broadly into: 1) The Southern Terrain (ST), which dominates the southern part of the quadrangle V-12 and extends into the Rheasilvia impact basin, exhibits very deep pyroxene absorptions. 2) The pyroxene signature in the Mid-Latitude Terrains (MLT) located mainly between 20 and 50°S is slightly subdued in comparison to the ST but still distinct. On a local scale, fresh bright material associated to a strong pyroxene signature appears in the vicinity of several small impact craters and their ejecta, whereas others partly show low albedo ("dark") ejecta with a strongly subdued pyroxene signature. Several large impact craters like the prominent impact crater Sextilia (~20km in diameter), from which the quadrangle itself is named, shows bright material on the crater rim, probably representing fresh material excavated due to mass wasting processes. Other peculiar impact craters like Helena (~41°S/122°E) partially resemble impact craters like Sextilia but also show portions of the crater buried by low albedo material with a subdued pyroxene signature. Only one of the two prominent scarps (i.e. Matronalia Rupes) shows a pronounced spectral signature of fresh material with very deep pyroxene absorptions characteristic for the ST terrain. The authors gratefully acknowledge the support of the Dawn Instrument, Operations, and Science Teams. This work is supported by NASA through the Dawn project and the German Space Agency (DLR).

elib-URL des Eintrags:https://elib.dlr.de/80547/
Dokumentart:Konferenzbeitrag (NICHT SPEZIFIZIERT)
Titel:Mineralogical Mapping of Quadrangle Av-12 (sextilia) on 4 Vesta
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Stephan, K.katrin.stephan (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Jaumann, R.ralf.jaumann (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Tosi, F.INAF-IASF Istituto di Astrofisica Spaziale e Fisica Cosmica, Roma ItalyNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Titus, Timothy N.United States Geological Survey, Astrogeology Science Center, 2255 N. Gemini Dr., Flagstaff, AZ 86001, USANICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
De sanctis, M.C.Istituto Nazionale di Astrofisica, Rome, Italy.NICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Krohn, Katrinkatrin.krohn (at) dlr.dehttps://orcid.org/0000-0001-8518-4985NICHT SPEZIFIZIERT
Matz, Klaus-Dieterklaus-dieter.matz (at) dlr.dehttps://orcid.org/0000-0002-4148-1926NICHT SPEZIFIZIERT
Roatsch, Thomasthomas.roatsch (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Preusker, Frankfrank.preusker (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Le Corre, L.Max Planck Institute for Solar System Research, Max-Planck-Str. 2, Katlenburg-Lindau, 37191, GermanyNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Reddy, V.Department of Space Studies, University of North Dakota, Grand Forks, ND 58202, USANICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Russell, C.T.Institute of Geophysics, University of California, Los Angeles, Los Angeles, CA 90095NICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Raymond, C.A.Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109-8099, USANICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:April 2012
Erschienen in:Copernicus
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:Vesta, Dawn
Veranstaltungstitel:EGU 2012
Veranstaltungsort:Wien, Österreich
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:22 April 2012
Veranstaltungsende:27 April 2012
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Erforschung des Weltraums
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R EW - Erforschung des Weltraums
DLR - Teilgebiet (Projekt, Vorhaben):R - Projekt DAWN (alt)
Standort: Berlin-Adlershof
Institute & Einrichtungen:Institut für Planetenforschung > Planetengeologie
Hinterlegt von: Aydin, Zeynep
Hinterlegt am:11 Jan 2013 13:59
Letzte Änderung:24 Apr 2024 19:47

Nur für Mitarbeiter des Archivs: Kontrollseite des Eintrags

Blättern
Suchen
Hilfe & Kontakt
Informationen
electronic library verwendet EPrints 3.3.12
Gestaltung Webseite und Datenbank: Copyright © Deutsches Zentrum für Luft- und Raumfahrt (DLR). Alle Rechte vorbehalten.