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The first Moscow Solar System Symposium (1M-S3) >>

Phobos Digital Terrain Model (DTM)Phobos Digital Terrain Model (DTM) and and Coordinate Refinement for Phobos-Grunt Mission Coordinate Refinement for Phobos-Grunt Mission

Support Support

K. Willner1, J.Oberst1,2, X. Shi3, H. Hoffmann2

1) Technische Universität Berlin, Department of Geodesy and Geoinformation Sciences, Berlin, Germany

2) German Aerospace Center (DLR), Institute of Planetary Research, Berlin-Adlershof, Germany3) Shanghai Astronomical Observatory, Chinese Academy of Sciences

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March 2010 flybys – HRSC / SRC imagesMarch 2010 flybys – HRSC / SRC images

SRC image 7982 Nadir image 7982SRC image 7937

Stereo 2 image 7926

SRC image 7926 Nadir image 7926

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Flyby Data Flyby Data

• Orbits 7915,7926, 7937: Nadir, Stereo and Photometry channels

• Area covered reaches from Western rim of Stickney to approx. 230° West and from North Pole to Equator

Orbit Flyby distance

ND / S1 / S2

Resolution

P1 / P2 Resolut

ion

7915 110 km 4 m/pixel

9 m/pixel

*7926 287 km 11

m/pixel24

m/pixel*

7937 476 km 19 m/pixel

39 m/pixel

Color channel resolutions

7948 663 km 29 m/pixel7959 850 km 34 m/pixel (8 x

binning)

* used for DTM reconstruction

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Image coverage Image coverage

March 2010 flybys

• Observation geometry was similar for all flybys

• Similar coverage and light conditions for all flybys

• Proposed landing site area of Phobos Grunt is covered and illuminated

Nadir channel image orbit 7926

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Landing Site DTMLanding Site DTM

Result of DTM reconstruction – 100 m/pixel lateral resolution, relative point accuracy +/- 10m

Control network published in EPSL serves as reference

Landing site location as described in Basilevsky & Shingareva, 2010

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Perspective ViewPerspective View

N

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Properties of the Landing AreaProperties of the Landing Area

• 2 x 2 degree grid shows gentle slopes within the landing area

• Almost flat terrain at landing site 1

• Small slope at proposed landing site 2

• Small number of craters in both proposed landing sites

12

Approx. Landing SitesBasilevsky & Shingareva, 2010

N

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Effective Surface AccelerationEffective Surface Acceleration

Shi, X. et al., 2010

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Effective Surface Acceleration - 2Effective Surface Acceleration - 2

Shi, X. et al., 2010

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Coordinates of the Suggested Landing Coordinates of the Suggested Landing SitesSites

Landing Site

Longitude

Latitude

1 217.7°W 15.5°N2 212.0°W 21.5°N

Coordinates refer to the coordinate frame defined by the control network (Willner et al., 2010)

Coordinates have an accuracy of +/- 0.1°

Coordinates refer to the coordinate frame defined by the control network (Willner et al., 2010)

Coordinates have an accuracy of +/- 0.1°

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OutlookOutlook

• Add further data and improve accuracy of DTM

• Image mosaic update (currently done)

• Map update

• Registration of color channel images to DTM

• Interpretation of multispectral images

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Other Phobos ActivitiesOther Phobos Activities

ISSI Workshop Series:

Phobos and Deimos – After Mars Express,

Before Phobos Grunt

First Workshop, March 2010, next: April 2011.

http://www.issibern.ch/teams/phobosdeimos/

Planned: Publication of a „Phobos Book“

WorkshopTeam:

Jürgen Oberst (Coord.)Alexander T. BasilevskyVeronique DehantThomas C. DuxburyRobert A. JacobsonMartin PätzoldCarle M. PietersKira B. ShingarevaPeter C. ThomasWilliam ThuillotAlexander V. Zakharov

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GETEMME, GETEMME, a Mission to Explore the Martian Satellites and the a Mission to Explore the Martian Satellites and the Fundamentals of Solar System PhysicsFundamentals of Solar System Physics

• A proposal for an ESA Cosmic Vision M-Class Mission for launch in 2022 or 2020

• Rendezvous with Deimos and Phobos, deploy Laser reflectors

• Monitor precise range from the spacecraft to Deimos, Phobos and Earth for 1 Mars year for studies of satellite dynamics and fundamental physics

• Comprehensive remote sensing of Deimos and Phobos

Proposal Team:

Jürgen Oberst, Valery Lainey, Christophe Le Poncin-Lafitte (Coordinators); Stephan Ulamec, Jens Biele, Harald Hoffmann, Konrad Willner,Veronique Dehant, Pascal Rosenblatt, Alexander V. Zakharov; > 100 proposal supporters