Diapositive 1

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Outer Solar System (OSS)A Planetary and
Fundamental Physics Mission to Neptune, Triton
and KBO
B. Christophe on behalf of OSS Team
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OSS
Planetary Physics
Fundamental Physics
Kuiper Belt Object
Argo, New Frontiers 4 Mission to Neptune, Triton
and KBO
Odyssey, Cosmic Vision 1 Mission to test deep
space gravity
Eddingtons Parameter at 10-7
NeptuneTriton
Deep SpaceGravity at 10 pm/s2
Inline with Fundamental Physics Roadmaps Advisory
Group Report
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Deep Space Gravity Test
Accurate Navigation of S/C
Positioning
What is the S/C trajectory ?
Radio-Science
1-way or 2-ways
Laser-Science
XKa band VLBI
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Laser Science two concepts
One-way pulsed laser (proposed by E. Samain OCA)
Two-ways continuous coherent laser (proposed by
P. Wolf SYRTE)
TESA TCL Terminal
Adaptative Optics on ground
1064 nm
Mercury Ion JPL or Horace Syrte clock
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Deep Space Gravity Test
Accurate Navigation of S/C
Positioning
What is the S/C trajectory ?
Radio-Science
1-way or 2-ways
Laser-Science
XKa band VLBI
Non Gravitational Forces
Is S/C on a geodesic ?
DC Accelerometer lt 10 pm/s2
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DC Accelerometer GAP
Electrostatic accelerometer MicroSTAR based on
heritage of CHAMP, GRACE and GOCE
missions (developed by ONERA)
Perfo 1 pm/s2
Bias Rejection System rotating stage with
piezo-electric motor(developed by ZARM)
For more details, see Benjamin Lenoir Poster
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General Relativity Test / Geodesy
Deep Space Gravity (OSS)
Gravitational Wave (LISA)
Equivalence Principle (Microscope)
Orbit determination Measure of NG
Differential acceleration Drag Compensation
Variation of Laser Link Drag Compensation
GRACE / NGGM
GOCE
CHAMP
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OSS Spacecraft
Planetary instruments UV Spectrometer 5.0
kg / 12 W High Resolution Narrow Camera 9.8 kg /
14 W IR Spectrometer / Wide Angle Camera
10.1 kg /7.5 W Radio Plasma Wave 4.7 kg
/ 7.9 W Thermal Map Imager 7.0 kg / 20
W Magnetometer 3.3 kg / 3 W Dust Particle
Detector 3.5 kg / 9 W
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Self-gravity Management

• Accelerometer at S/C CoG
• S/C mass far from accelerometer
• Symmetry of tanks
• Membranes for ergol location
• Thermal Gauging Book Keeping for ergol mass

Self-gravity lt 14 pm/s2
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Conclusions

• OSS was not selected by ESA for Cosmic Vision M3
• Fundamental Physics Objectives considered strong
• Planetary Objectives considered weak (flyby
  instead orbiter)
• RTG availability considered as a risk
• Launcher cost by US considered as a strategic
  risk
• OSS allows to do pioneer work on
• Merging of Fundamental and Planetary Physics as
  recommended by FPRAT
• Adaptative optics for 2-ways laser link
• DC accelerometer with 1 pm/s2 accuracy
• S/C design for severe self-gravity requirement
• Future works should concerns
• Integration of the DC accelerometer in the S/C
• Convincing planetary community of interest of
  accelerometer

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Acknowledgement to OSS scientific supporters

• European side PI B. Christophe (ONERA)
• CESR (France)  Nicolas André
• DLR / Institute of Planetary Research (Germany)
  Ralf Jaumann, Jörn Helbert, Hauke Hussmann,
  Nicole Schmitz, Frank Sohl, Katrin Stephan
• DLR / Institute of Space System (Germany)
  Hansjörg Dittus, Marco Sharringhausen, Tim van
  Zoest
• GeoAzur / OCA (France) Gilles Métris, Etienne
  Samain
• IGEP, TU Braunschweig (Germany) Karl-Heinz
  Glassmeier, Daniel Heyner
• Imperial College (United Kingdom) Patrick
  Brown, Michelle Dougherty, Tim Sumner
• Institute for Geophysics and Meteorology / Univ.
  Köln (Germany) Martin Pätzold
• Institute for Planetology / Westfälische Wilhelms
  Universität (Germany) Harry Hiesinger
• Institut für Geowissenschaften / Max Planck
  Institute (Germany) Frank Postberg, Ralf Srama
• Institut für Physik und Astronomie / Universität
  Postdam (Germany) Jürgen Schmidt
• Instituto Superior Técnico (Portugal) Frederico
  Francisco, Paulo J.S. Gil, Jorge Páramos
• JIVE (The Netherlands) Sergei V. Progrebenko
• LATMOS (France) Jean-Louis Bertaux, François
  Leblanc, Eric Quemerais
• LESIA / Observatoire de Paris (France) Antonella
  Barucci, Baptiste Cecconi, Laurent Lamy
• LKB / ENS (France) Jean-Michel Courty, Brahim
  Lamine, Serge Reynaud
• ONERA (France)  Bruno Christophe, Bernard
  Foulon, Benjamin Lenoir, Agnès Levy, Vincent
  Michau, Clélia Robert, Marc Séchaud, Pierre
  Touboul
• Rutherford Appleton Laboratory (United Kingdom)
  Robert Bingham
• Service d'Astrophysique/IRFU CEA Saclay
  (France)  Roland Lehoucq

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