Lunar ranging group lunar team
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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

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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


Murphy

murphy


Lunar ranging group lunar team

gsfc


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

    • FREDNETSean Casey

  • Multiple Missions that May Be Successful

    • Achieve an Array of Retroreflectors


Deployment lander

Deployment Lander


Surface deployment

Surface Deployment


Anchored deployment astrobotics honeybee

Anchored DeploymentAstrobotics & Honeybee


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

    • LatitudeOffsets 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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