Outer Solar System (OSS) A Planetary and Fundamental Physics Mission to Neptune, Triton and KBO B....
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Transcript of Outer Solar System (OSS) A Planetary and Fundamental Physics Mission to Neptune, Triton and KBO B....
Outer Solar System (OSS)A Planetary and Fundamental Physics Mission to Neptune, Triton and KBO
B. Christophe on behalf of OSS Team
2
OSS
Eddington’s Parameter at 10-7
Deep SpaceGravity at 10 pm/s2
NeptuneTriton
Kuiper Belt Object
Od
ysse
y, C
osm
ic V
isio
n 1
Mis
sion
to
test
dee
p sp
ace
grav
ityA
rgo
, New
Fro
ntiers 4
Mission to N
eptune, Triton and K
BO
Planetary PhysicsFundamental Physics
Inline with Fundamental Physics Roadmaps Advisory Group Report
3
Deep Space Gravity Test
Accurate Navigation of S/CAccurate Navigation of S/C
Radio-Science
Laser-Science
PositioningPositioning
1-way or2-waysX+Ka band
VLBI
What is the S/C trajectory ?What is the S/C trajectory ?
4
Laser Science: two concepts
One-way pulsed laser(proposed by E. Samain – OCA)
Two-ways continuous coherent laser(proposed by P. Wolf – SYRTE)
Clock
Spectral Filter
Linear Photo-
Detection
Coarse Timing (FPGA)
Res = 10 ns
Temporal Filter (x pseudo
random code)
Calculator
Fine Timing(Vernier)
Res = 10 ps
Frequency Synthesis
Telemetry
Laser pulse
Clock
Spectral Filter
Linear Photo-
Detection
Coarse Timing (FPGA)
Res = 10 ns
Temporal Filter (x pseudo
random code)
Calculator
Fine Timing(Vernier)
Res = 10 ps
Frequency Synthesis
Telemetry
Laser pulse
TESA TCL Terminal
PLL Laser
USO
100 MHzfrom ground
to ground
PBS
1064 nmMercury Ion JPL or Horace Syrte clock
Adaptative Optics on ground
5
Deep Space Gravity Test
Accurate Navigation of S/CAccurate Navigation of S/C
Radio-Science
Laser-Science
PositioningPositioning
1-way or2-ways
Non Gravitational ForcesNon Gravitational Forces
DC Accelerometer< 10 pm/s2
X+Ka bandVLBI
Is S/C on a geodesic ?Is S/C on a geodesic ?
What is the S/C trajectory ?What is the S/C trajectory ?
6
DC Accelerometer GAP
Noise of MicroSTAR
1.E-13
1.E-12
1.E-11
1.E-10
1.E-09
1.E-08
1.E-05 1.E-04 1.E-03 1.E-02 1.E-01 1.E+00
Frequency (Hz)
No
ise
(m
/s2 /H
z1/
2 )
Total
Detector
Wire damp
ADC
CPD
Meas
Recomb
PID
Electrostatic accelerometer MicroSTAR based on heritage of
CHAMP, GRACE and GOCE missions(developed by ONERA)
Bias Rejection System rotating stage with piezo-electric motor
(developed by ZARM)
Perfo ~ 1 pm/s2
For more details, see Benjamin Lenoir Poster
7
General Relativity Test / Geodesy
Deep Space Gravity(OSS)
Gravitational Wave(LISA)
Equivalence Principle(Microscope)
GRACE / NGGMCHAMP GOCE
Orbit determinationMeasure of NG
Variation of Laser LinkDrag Compensation
Differential accelerationDrag Compensation
8
OSS Spacecraft
RPW (x3)
MAG
Imaging instruments
Laser telescope
HGA
Towards Earth
Towards ram
Boresights direction for planetary observation GAP on
settable plate
ASRG
ASRG
4 tanks symmetric wrt GAP,
interconnected fluid
Imaging instruments
Fundamental Physics Inst.
DC Accelerometer : 3.5 kg / 3 WRadio-Science: 3.5 kg / 40 WUSO: 1.5 kg / 5.5 W1-way Laser Science: 14.5 kg / 20 W2-ways Laser Science:25 kg / 80 W
Planetary instruments
UV Spectrometer: 5.0 kg / 12 WHigh Resolution Narrow Camera: 9.8 kg / 14 WIR Spectrometer / Wide Angle Camera:
10.1 kg /7.5 WRadio Plasma Wave: 4.7 kg / 7.9 WThermal Map Imager: 7.0 kg / 20 WMagnetometer: 3.3 kg / 3 WDust Particle Detector: 3.5 kg / 9 W
S/C Data Sheet
Mass: 540 kg (48 kg payload)Available Power: 294 W BoL, 250 W EoLComm: 2.1 m antenna, Band KaAttitude Control: 3 axis (±0.03°)Propulsion: 4 tanks of hydrazine
9
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 < 14 pm/s2
10
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
11 11
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• SYRTE / Observatoire de Paris (France): Peter Wolf• Universidade do Porto (Portugal): Orfeu Bertolami• University of Oxford (UK): Leigh Fletcher• ZARM (Germany) : Claus Lämmerzahl, Hanns Selig
• US side: co-PI L. Spilker (JPL)• Cornell University: Dr. Don Banfield• JPL / NASA: Dr. John D. Anderson (retired), Dr. Sami W. Asmar, Dr. Glenn Orton, Dr. Kim R. Reh, Dr. Linda J. Spilker, Dr. Thomas R. Spilker• Lowell Observatory: Dr. Will Grundy• Planetary Science Institute: Dr. Candice Hansen• UCLA: Dr. Johnatan Aurnou, Dr. Ravit Helled, Dr. Kunio Sanayagi