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Imaging Asteroid 4 Vesta using the framing camera

Keller, H. Uwe and Nathues, Andreas and Coradini, Angioletta and Jaumann, Ralf and Jorda, Laurent and Li, Jian-Yang and Mittlefehldt, David W. and Mottola, Stefano and Raymond, C.A. and Schröder, Stefan E. (2011) Imaging Asteroid 4 Vesta using the framing camera. GSA Annual Meeting, 09.10.-12.10.11, Minneapolis, USA.

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The Framing Camera (FC) onboard the Dawn spacecraft serves a dual purpose. Next to its central role as a prime science instrument it is also used for the complex navigation of the ion drive spacecraft. The CCD detector with 1024 by 1024 pixels provides the stability for a multiyear mission and its high requirements of photometric accuracy over the wavelength band from 400 to 1000 nm covered by 7 band-pass filters. Vesta will be observed from 3 orbit stages with image scales of 227, 63, and 17 m/px, respectively. The mapping of Vesta’s surface with medium resolution will be only completed during the exit phase when the north pole will be illuminated. A detailed pointing strategy will cover the surface at least twice at similar phase angles to provide stereo views for reconstruction of the topography. During approach the phase function of Vesta was determined over a range of angles not accessible from earth. This is the first step in deriving the photometric function of the surface. Combining the topography based on stereo tie points with the photometry in an iterative procedure will disclose details of the surface morphology at considerably smaller scales than the pixel scale. The 7 color filters are well positioned to provide information on the spectral slope in the visible, the depth of the strong pyroxene absorption band, and their variability over the surface. Cross calibration with the VIR spectrometer that extends into the near IR will provide detailed maps of Vesta’s surface mineralogy and physical properties. Georeferncing all these observation will result in a coherent and unique data set. During Dawn’s approach and capture FC has already demonstrated its performance. The strong variegation observed by the Hubble Space Telescope can now be correlated with surface units and features. We will report on results obtained from images taken during survey mode covering the whole illuminated surface. Vesta is a planet-like differentiated body, but its surface gravity and escape velocity are comparable to those of other asteroids and hence much smaller than those of the inner planets or the Moon. The comparison with 21 Lutetia, recently passed by the Rosetta comet rendezvous mission, will reveal the effects of body differentiation on surface cratering and morphology and will at the same time improve our understanding of Vesta’s interior.

Item URL in elib:https://elib.dlr.de/70786/
Document Type:Conference or Workshop Item (Speech)
Title:Imaging Asteroid 4 Vesta using the framing camera
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Nathues, AndreasMax-Planck-Institut für Sonnensystemforschung, Max-Planck-Str. 3, Katlenburg-Lindau, 37191, GermanyUNSPECIFIED
Coradini, AngiolettaIstituto di Astrofisica Spaziale e Fisica Cosmica, Area Ricerca - Roma 2 Tor Vergata, Via Fosso del Cavaliere, 100, Rome, 00133, ItalyUNSPECIFIED
Jorda, LaurentLaboratoire d'Astrophysique de Marseille, 38 rue Frederic Joliot-Curie, Marseille, F-13013 f, FranceUNSPECIFIED
Li, Jian-YangDepartment of Astronomy, University of Maryland at College Park, College Park, MD 20742-242UNSPECIFIED
Mittlefehldt, David W.NASA, Johnson Space Center, mail code KR, 2101 NASA Parkway, Houston, TX 77058UNSPECIFIED
Raymond, C.A.Jet Propulsion Laboratory, Pasadena, CA 91109UNSPECIFIED
Schröder, Stefan E.Max-Planck-Institut für Sonnensystemforschung, Max-Planck-Str. 3, Katlenburg-Lindau, 37191, GermanyUNSPECIFIED
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Dawn, Vesta, meteorite, framing camera
Event Title:GSA Annual Meeting
Event Location:Minneapolis, USA
Event Type:international Conference
Event Dates:09.10.-12.10.11
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Project DAWN
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Geology
Deposited By: Pieth, Susanne
Deposited On:09 Dec 2011 14:31
Last Modified:09 Dec 2011 14:31

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