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Lunar Ranging Group LUNAR Team. Gravitational Physics Lunar Physics Lunar Laser Ranging 12 April 2011 Pasadena, California. Overall Schedule. University of Califonia , San Diego Tom Murphy Via Telephone Goddard Space Flight Centrer Stephen Merkowitz / Alix Preston Via Telephone

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lunar ranging group lunar team

Lunar Ranging GroupLUNAR Team

Gravitational Physics

Lunar Physics

Lunar Laser Ranging

12 April 2011

Pasadena, California

overall schedule
Overall Schedule
  • University of Califonia, San Diego
    • Tom Murphy
    • Via Telephone
  • Goddard Space Flight Centrer
    • Stephen Merkowitz / Alix Preston
    • Via Telephone
  • University of Maryland, College Park
    • Doug Currie
decadal survey submissions
Decadal Survey Submissions
  • Astronomy and AstroPhysics Decadal Survey
    • Gravitational and Particle Physics Panel Report
    • Many Excellent Comments on the Value of LLR
  • Planetary Sciences Decadal Survey
    • Lunar Geophysical Network
      • Recommended for New Frontier Mission
      • Would Place Four Retroreflectors on the Moon
topics umd
Topics UMd
  • Talks
  • Decadal
  • Computer Simulations
    • Result
  • Review Deployment & Roles
  • GLXP
    • Candidates
    • Functions
  • Deployment
    • Lander
    • Surface
    • Drilling
  • Lifetime
    • Murphy
    • Sun Shade
    • Dust Bombardment
  • Future Talks & Activities
    • Dust
    • ILRS
      • Status and Suggestions
      • Ground Stations
    • Tests at Frascati
    • NLSI
      • Talk
      • Demonstration
conference proceedings
Conference Proceedings
  • Currie, D. G., , the LLRRA-21/LSSO Team & the MoonLIGHT/INFN-LNF Team 2010, “A Lunar Laser Ranging RetroReflector Array for the 21st Century” 40th Lunar and Planetary Science Conference, The Woodlands, TX 1
  • Currie, D. G., Zacny, K., 2010 Regolith Drilling for the Lunar Laser Ranging Retroreflector Array for the 21st Century, LUNAR Workshop, Cambridge MA
  • Currie, D. G., Zacny, K., the LLRRA-21/LSSO Team & the MoonLIGHT/INFN-LNF Team 2010 ”A Lunar Laser Ranging RetroReflector Array for the 21st Century” Lunar Exploration Analysis Group Washington DC.
  • Dell\'Agnello, S., DelleMonache, G. O., Currie, D. G., et. All, G., & McElfresh D. “The Moon as a test body for General Relativity and new gravitational theories” presented at the conference European Planetary Science Congress 2010 (ESPC2010) at the Angelicum Centre – Pontifical University of Saint Thomas Aquinas, Rome, Italy.
  • Dell’Agnello, S. , Currie, D. G. , DelleMonacheG. O. , et al Cantone, C. Garattini, M. Martini, M. Intaglietta, N. Lops C. , March, R , Tauraso, R, Bellettini G. , Maiello, M , Berardi, S. , Porcelli, L.; "Next Generation Lunar Laser Ranging and its GNSS Applications"; IEEE Aerospace Conference, Big Sky (MT),
  • Peron, R.; Bellettini, G.; Berardi, S.; Boni, A.; Cantone, C.; Coradini, A.; Currie, D. G.; Dell\'Agnello, S.; DelleMonache, G. O.; , et al. “Advanced instrumentation for Solar System gravitational physics” EGU General Assembly 2010, held 2-7 May, 2010 in Vienna, Austria,
  • Currie, D. G., DelleMonache & G. O. Dell’Agnello, S. 2010 “A Lunar Laser Retroreflector for the FOR the 21ST Century (LLRRA-21): Selenodesy, Science and Status” 2010 American Geophysical Union Fall Meeting San Francisco, CA
  • Currie, D. G., Dell’Agnello, S. & DelleMonache, G. O. 2011 “LUNAR LASER RANGING: FLIGHT HARDWARE SIMULATION, TESTING AND STATUS”. Lunar and Planetary Science Conference, The Woodlands, TX ,
talks colloquia and public presentations
Talks, Colloquia and Public Presentations
  • Talks at Scientific Conferences
  • Currie, D. G., & the LLRRA-21 Teams 2011 “A LUNAR LASER RANGING RETRO-REFLECTOR ARRAY for the 21st CENTURY” 2nd Lunar Laser Ranging Workshop, International Space Sciences Institute, Bern Switzerland
  • Currie, D. G., & The LLRRA-21 Teams 2010 “A LUNAR LASER RANGING RETRO-REFLECTOR ARRAY for the 21st CENTURY” LUNAR Workshop Boulder CO
  • Currie, D. G., Dell’Agnello, S. & DelleMonache, G. O. 2010 A Lunar Laser Ranging Retroreflector Array for the 21st Century ISOT 2010 International Symposium on Optomechatronic Technologies, Toronto, Canada
  • Currie, D. G., & the LLRRA-21 Teams 2011 “A LUNAR LASER RANGING RETRO-REFLECTOR ARRAY for the 21st CENTURY” 2nd Lunar Laser Ranging Workshop, International Space Sciences Institute, Bern Switzerland
  • Dell’Agnello, S.; Currie, D. G.; DelleMonache, G. O.; Lops, C.; M. Martini 2010 “LLRRA21/MoonLIGHT: a 2nd Generation Lunar Laser Ranging Array for Precision Gravity Tests and Lunar Science Measurements” at the Conference Global Lunar Conference – Beijing, China.
  • Ddd 31 May-3 June 2010 talk
  • Colloquia and Public Presentations
  • Currie, D. G. 2011 2nd NLSI Commerce Virtual Lecture A Lunar Laser Ranging Retroreflector for the 21st Century
computer simulations
Computer Simulations
  • Problems
    • Commercial Software Issues
    • Computer Failures
    • 300 Million Beer’s Law Calculations for Each
  • Computer simulation Objectives
    • End to End Simulation
  • Technical Objectives
    • Selection of Thermal Coatings
    • Effects of Shorter Sun Shade
      • GLXP Candidates for Size / Angular Tolerances
  • Eclipse Effects
    • For LLRRA-21, not Apollo
computer simulations 500 time steps over a lunation
Computer Simulations500 Time Steps Over a Lunation
  • HeatLoad3D
    • IDL – University of Maryland
    • Evaluates Solar Heat Loads in CCR at ~ a Million Nodes
  • Thermal Desktop
    • Commercial - Cullimorgan and Ring Technologies
    • Combine CCR Heat Loads with Solar Inputs to Temperature at 1733 Nodes
  • TempToPhase
    • IDL – University of Maryland
    • Converts Temperatures from thermal Desktop into Phase Errors
  • Code V
    • Commercial -
    • Combines Thermal Phase Errors with TIR Phases and Effect of Offset Angles
  • Analysis
    • IDL – University of Maryland
    • Converts Far Field Diffraction Patterns into Useful Operational Results
frascati testing
Frascati Testing
  • Thermal Vacuum Tests
    • Optical Table for Far Field Diffraction Pattern
    • InfraRed Camera for Temperature Meaurements
    • Optical Simulator for “Sun”
    • Thermal Sensors on CCR
  • Images of Chamber and CCR Face
different deployment versions single shot range accuracy
Different Deployment VersionsSingle Shot Range Accuracy
  • Current Single Shot Accuracy is ~20 mm
  • If Mounted on Lander
    • Thermal Expansion of Lander
    • Heat Flux from Lander
    • Single Shot Accuracy of 1-3 millimeters
  • If a Surface Deployment
    • Thermal Expansion of Regolith
    • Heat Flux from Lander
    • Sub-Millimeter Single Shot Accuracy
  • If an Anchored Deployment
    • Anchored at ~1 meter depth
    • Better than 100 micron Single Shot Accuracy
google lunar x prize
Google Lunar X Prize
  • Prize by Google Corporation for 30 M$
    • Only Private Money for GLXP Objectives
  • Can Be Government Money
    • For Other Objectives – Like LLRRA-21
  • Currently Working with:
    • Lunar Express, Hai Li
    • Astrobotics David Gump
    • Moon Express Bob Richards
    • NextGreatLeap Michael Joyce
    • Penn State University Miles Smith
    • FREDNET Sean Casey
  • Multiple Missions that May Be Successful
    • Achieve an Array of Retroreflectors
lifetime of llrra 21
Lifetime of LLRRA-21
  • Degradation of Laser Returns
    • Tom Murphy and APOLLO Station
    • Factor of 9.6 over 40 years
  • Amelioration of Problem
    • Sun Shade
      • Blocks Dust Deposition
      • Block Micrometeorite Bombardment
  • But What is the Real Reason for Degradation?
    • For Micrometeorite Bombardment
    • Test at Horanyi’s Dust Accelerator
signal level for one llrra 21
Signal Level for One LLRRA-21
  • Briefly
    • LLRRA-21 Signal ~ Equal to Apollo 15 Array
    • Therefore Can Works with Sub-Meter Telescopes
      • Will Need to Upgrade of Laser, Timing Electronics
      • McDonald at 0.67 meter Currently successfully Ranges to A15
    • Long Life - Dust Issues Handled with SunShade
  • More Precisely – IsoThermal
    • Station Angle LLRRA-21 Signal Return
    • Latitude Offsets w.r.t. A15
    • 45 Yes 78%
    • 45 No 58%
    • 00 Yes 88%
    • 00 No 71%
future objectives
Future Objectives
  • Schedule: >> Driven by the Google Lunar X Prize Launch
    • April/December 2013 i.e., Astrobotics
    • Need to Finalize the Design
    • Need to Attain Sufficient TRL to Obtain Funding i.e., T/V/O Test
    • Need to Fabricate/Test/Integrate Flight Hardware
  • Simulations to Optimize Thermal Coatings
    • To Control Thermal Gradients and thus Signal
    • Optimize within Limits of Pracitical Coatings
    • Different Choices for Different GLXP Missions
  • Interactions with GLXP Teams
    • Each has Different Physical & Organizational Structures
    • Therefore Each Requires Somewhat Different Thermal Design
    • Each Requires Different Emplacement Procedures
future talks activities
Future Talks & Activities
  • Evaluate Dust Bombardment
    • MihalyHoranyi – Dust Accelerator - Early May
  • International Laser Ranging Service Meeting – Late May
    • Present Status of LLRRA-21 to Actual Ranging Groups
    • Collect Suggestions from Operators
    • Present What is Needed for Ground Stations for LLRRA-21
  • Thermal/Vacuum/Optical Tests at Frascati
    • Early June – TRL 6.5 -> TRL 7.0
  • NASA Lunar Science Institute – Mid July
    • Talk on LLRRA-21 Hardware and GLXP Mission Status
    • Report on Honeybee Grant on Pneumatic Drill for LLRRA-21
    • Demonstration of Pneumatic Drilling
      • Probably Mounted on Astrobotic Lander
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