Lect3 Taxonomy (09-29-09)

Lect3 Taxonomy (09-29-09) - - HW due Oct. 8 Asteroids III...

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- HW due Oct. 8 Asteroids III Gaffey Abstract and Sections 1, 4, 5, 6 -HW due Oct. 15 Asteroids III Rivkin Abstract and Sections 1, 4, 5, 6, 7, 8
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Asteroid Taxonomy and Mineralogy
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Outline of Asteroid Taxonomy/ Mineralogy I. Background II. C, S and M Classes (1970’s) III. Tholen Classes (1984) IV. Other Classifications, including S subclasses V. Distribution of Asteroid Types VI. Mineralogical Interpretation of Taxonomy VII. What does all this mean?
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Background Is it possible to do mineralogy of asteroids remotely? Asteroid 4 Vesta (Gaffey, 1997) Reflectance Spectroscopy
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Background Is it possible to do mineralogy of asteroids remotely? Yes! But in some cases its relatively easy and in others its almost impossible Asteroid 4 Vesta (Gaffey, 1997) Reflectance Spectroscopy
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Background Measurement of amount of light as function of wavelength Requires some tool (e.g., grating) to separate different wavelengths, to make it possible to measure single wavelength Alternative: filters Pro: Get more signal than with spectrometer Con: Only get broad “colors” Which does one use and when? Filter “Color” Center λ (nm) U Ultraviole t 350 B Blue 450 V Visible 550 R Red 650 I Infrared 700-1000
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Reasons for reflectance spectroscopy of asteroids Classification Mineralogy Connection between meteorite types, asteroid types Comparison of 4 Vesta with meteorites (Gaffey, 1997)
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Difference between Taxonomy and Mineralogy Taxonomy: Classification into groups depending on observed spectra Mineralogy: Interpretation of those spectra in terms of specific minerals
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II. Asteroid Classes C, S and M In the 1970’s Chapman et al. come up with C, S
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Lect3 Taxonomy (09-29-09) - - HW due Oct. 8 Asteroids III...

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