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Lunar Mineralogy

Lunar Mineralogy

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Lunar Mineralogy

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  1. Lunar Mineralogy Kaylan Meinecke ASU NASA Space Grant Lunar Reconnaissance Orbiter Office Mentor: Samuel Lawrence 18 April 2009

  2. Lunar History • Apollo missions (1968-1972) • Sample collection • Incomplete information about the character and distribution of lunar materials • Limited varieties of terrain • LRO • Prepare for human exploration • Assessment of lunar crustal rock types and useable resources Astronaut Buzz Aldrin, Apollo 11 mission, 1969.

  3. Background • Hapke’s Radiative Transfer Theory • VIS/NIR • Spectral Mixing Model • Mineralogy • Chemistry • Particle size • Degree of space weathering

  4. Programming • Grid Search Algorithm • Geologically plausible reflectance spectra • Range: 0.8 – 2.3 microns • Comparisons constrained by varying degrees of space weathering

  5. Investigation • Degrees of Space Weathering • Minimum: 0.1 ppt • Maximum: 25 ppt • Results • Minimum • Each spectrum matched itself • Maximum • Matches ranged from few to many • Dependent on mineral composition distribution derived from grid search algorithm

  6. Investigation • Analysis • Minimum space weathering • Cause of matches • Degree of space weathering too constrained for significant/visible spectral differences • Maximum space weathering • Cause of matches

  7. Implications • Only compositions with lots of space weathering are affected • Do these hyper-mature compositions exist? • Tested grid search algorithm can serve as a base for larger datasets from NASA missions Chandrayaan

  8. Future Work • Adjusting data to work on multispectral data • Using other spectral interpretation techniques in conjunction with grid search algorithm • Analysis of remote sensing data from lunar and asteroid surfaces to derive mineral composition maps

  9. Sources • Lawrence, Samuel J., and Lucey, Paul G. Radiative Transfer Mixing Models of Meteoritic Assembleges. • NASA Langley Research Center's Contributions to the Apollo Program. December 1996. http://oea.larc.nasa.gov/PAIS/Apollo.html • ISRO Gears Up to Launch Country's First Unmanned Mission to Moon http://current.com/items/89321344/isro_gears_up_to_launch_country _s_first_unmanned_mission_to_moon.htm