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Spectro-Polarimetric Survey of the Lunar Surface. 김성수 경희대학교 우주탐사회 워크샵 , 2014 년 2 월. Spectro-Polarimetric Imaging. The Lunar Regolith Exposure to charged particles and micrometeor bombardment causes accumulation of nanophase reduced iron (npFe 0 ) on lunar regolith grains, - PowerPoint PPT Presentation
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Spectro-Polarimetric Surveyof the Lunar Surface
김성수경희대학교
우주탐사회 워크샵 , 2014 년 2 월
Spectro-Polarimetric Imaging
• The Lunar Regolith– Exposure to charged particles and micrometeor bombardment causes
• accumulation of nanophase reduced iron (npFe0) on lunar regolith grains,• decrease in grain size,• enrichment with glass material and agglutinates.
– Measurements of the grain-size distributions will aid in the evaluation of dusty lunar environments both for human sorties and potential sites for lunar facilities.
– Composition and grain size distribution, and the effects of space weathering are also crucial for understanding the structure and evolution of the Moon.
– The evolution of from immature to mature grains is manifested in their spectral and polarimetric properties.
– But, none of the recent or planned lunar orbiter missions are equipped with polarimetric optics.
Reference: Hines, D.C., Shkuratov, Y., Kreslavsky, M., Schneider, G., Videen, G., Sitko, M., Hammel, H.B., & Wolff, M., 2008, "Probing the Lunar Surface Using Spatially Resolved Optical and Near-IR Imaging Polarimetry with HST/ACS and HST/NICMOS", a "white paper" in response to “Lunar Science with HST” initiative solicited by STScI.
Evolution of Grain Sizes
Observed Polarizations
Observed Polarizations
Estimation of Particle Sizes
3 1.37max 10 (0.021 1.76)P d A
Observations at Lick
경희대학교 Lick 천문대
Polarimetry at 5 Bands
경희대학교 Lick 천문대
Polarimetry at 5 Bands
Polarimetry at 5 Bands
Wavelength dependency of c1 parameters
3 1.37max 10 (0.021 1.76)P d A
Thorium and Titanium maps
c1(u)/c1(i)
TitaniumThorium
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