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Shape model and rotational state of dwarf planet Ceres from Dawn FC stereo images

Preusker, Frank and Scholten, Frank and Matz, Klaus-Dieter and Roatsch, Thomas and Elgner, Stephan and Jaumann, Ralf and Joy, Steve P. and Polanskey, Carol A. and Raymond, Carol A. and Russell, Christopher T. (2015) Shape model and rotational state of dwarf planet Ceres from Dawn FC stereo images. European Planetary Science Congress, 27 Oct - 02 Nov 2015, Nantes, France.

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Official URL: http://meetingorganizer.copernicus.org/EPSC2015/EPSC2015-186-1.pdf


In February 2015 during the Ceres Approach phase, 76 clear filter images were acquired to investigate the rotational characteristics of Ceres. During two observation sequences (RC1 and RC2) the entire illuminated surface of Ceres was mapped in visible wavelengths as a rotational movie with a nominal image scale of about 8 km/pixel and 4 km, respectively. We applied our stereo-photogrammetric processing described above and derived a 3D control point network. From that we determined the spin rate of Ceres to be 952.1532 degree/day, which perfectly matches the previous determination from ground-based data [7]. Additionally we refined Ceres’s spin axis orientation to be: right ascension = 291.62° ± 0.2°, declination = 66.47° ± 0.1°, which matches within error the values formerly determined from Earth-based observations [8]. Finally we adjusted the nominal orientation and applied dense multi-image matchingto compute a dense surface point cloud. From that we derived a first surface model of Ceres (see Figure 1) with a lateral spacing of about 4 km/pixel and mean point accuracy of 800 m. The reference coordinate system used to depict the shape model is defined by spin axis orientation (values above) and the prime meridian definition with W0=170.90° [8]. This reference frame will be finally fixed using Survey orbit observations.

Item URL in elib:https://elib.dlr.de/101355/
Document Type:Conference or Workshop Item (Speech)
Title:Shape model and rotational state of dwarf planet Ceres from Dawn FC stereo images
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Preusker, Frankfrank.preusker (at) dlr.deUNSPECIFIED
Scholten, Frankfrank.scholten (at) dlr.deUNSPECIFIED
Matz, Klaus-Dieterklaus-dieter.matz (at) dlr.deUNSPECIFIED
Roatsch, Thomasthomas.roatsch (at) dlr.deUNSPECIFIED
Elgner, Stephanstephan.elgner (at) dlr.deUNSPECIFIED
Jaumann, RalfRalf.Jaumann (at) dlr.deUNSPECIFIED
Joy, Steve P.Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109-8099, USAUNSPECIFIED
Polanskey, Carol A.Jet Propulsion Laboratory, California Institute of Technology, Pasadena CA 91109, USAUNSPECIFIED
Raymond, Carol A.Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States.UNSPECIFIED
Russell, Christopher T.Institute of Geophysics, University of California, Los Angeles, Los Angeles, CA 90095UNSPECIFIED
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:Dawn, Ceres, FC, shape model
Event Title:European Planetary Science Congress
Event Location:Nantes, France
Event Type:international Conference
Event Dates:27 Oct - 02 Nov 2015
Organizer:Copernicus Meetings
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 Geodesy
Institute of Planetary Research > Planetary Geology
Deposited By: Scholten, Dipl.-Ing. Frank
Deposited On:05 Jan 2016 13:00
Last Modified:31 Jul 2019 19:58

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