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Francesca demeo11/28/2023 ![]() ![]() Facebook gives people the power to share and makes the world more open and connected. Review the relevance of asteroids and their compositions in their greaterĬontext within our Solar System and beyond. Join Facebook to connect with Francesca De Meo and others you may know. State of understanding of these questions to form the big picture of theįormation and evolution of asteroids in the Main Belt. This chapter also reviews the major outstanding questions relating toĪsteroid compositions and distributions and summarizes the progress and current Of the heliocentric distribution of asteroid compositions seen in the Main Belt Reviews the advancements on the fronts of asteroid compositionalĬharacterization, meteorite measurements, and dynamical theories in the context Through evolutionary processes after Solar System formation. She was fascinated by it as a kid, and eventually studied it through high school all the way to post-doc, as an astronomer specializing in asteroids. Planetesimals are primordial, but instead those belts were formed and sculpted Amazon Marketplace seller Francesca DeMeo loves space. An expert in spectral studies of small bodies, she. The entire Solar System?" No longer is the leading theory that two belts of DeMeo, a postdoctoral researcher at MIT who completed her 2010 Ph.D. Has changed from "What was the original compositional gradient of the Asteroidīelt?" to "What was the original compositional gradient of small bodies across Put in context with meteorite measurements and dynamical models, a newĪnd more complete picture of Solar System evolution has emerged. Of data has allowed us to create a new global picture of the Main Asteroidīelt. Over 100,000 with some measurement of physical characterization. DeMeo and 4 other authors Download PDF Abstract: The past decade has brought major improvements in large-scale asteroidĭiscovery and characterization with over half a million known asteroids and Our Themis group results are as expected and are consistent with previous work, but our Pallas group results are new and, in some cases, in conflict with previous work.Download a PDF of the paper titled The Compositional Structure of the Asteroid Belt, by Francesca E. Allowing for reasonable uncertainties in the spectral matches, we find no need to invoke mineralogies that do not exist in the meteorite collection to explain B-type spectra or their negative slopes. The Themis group objects show a trend of analogs from the CI, CM, CR, CI-Unusual, and CM-Unusual meteorites (as expected from the work of Hiroi et al. Only three of the seven Pallas-like objects are determined to be dynamically related (2, 1508, and 6411). Join Facebook to connect with Francesca Gino Demeo and others you may know. The Pallas group objects show a trend of analogs from the CV, CO, and CK meteorite groups. View the profiles of people named Francesca Gino Demeo. The asteroid spectra are compared to mineral and meteorite spectra from the Reflectance Experiment Laboratory library of 15,000 samples, in a least squares search for particulate analogs, constrained by spectral brightness. The spectra fall naturally into three groups: (1) those with negative (blue) spectral shapes like 2 Pallas (7 objects), (2) those with concave curve shapes like 24 Themis (11 objects), and (3) everything else (4 objects). What causes this? Visible to near-infrared reflectance spectra (0.4-2.5 mm) are assembled for 22 B-type asteroids. ![]() B-type asteroids have a negative slope from similar to 0.5 to similar to 1.1 mm and beyond.
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