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IN OCTOBER 2008 A SMALL ASTEROID WITH AN F-TYPE REFLECTANCE SPECTRUM 2008 TC3 EXPLODED OVER THE NUBIAN DESERT AND DEPOSITED MATERIAL IN A STREWN FIELD IN NORTHERN SUDAN. SEARCHES TO-DATE HAVE LED TO COLLECTION OF>600 STONES THOUGHT TO BE DERIVED FROM 2008 TC3. THESE MATERIALS ARE NAMED ALMAHATA SITTA (AHS) AND REPRESENT THE FIRST RECOVERED METEORITE FROM A SPECTRALLY OBSERVED ASTEROID. THE DISCOVERY TRACKING SPECTRAL ANALYSIS AND RECOVERY OF MATERIAL FROM 2008 TC3/AHS WAS A REMARKABLE SERIES OF EVENTS AND A TESTAMENT TO THE BENEFITS OF CROSS-DISCIPLINARY AND INTERNATIONAL COOPERATION. BUT THE LIST OF REMARKABLE THINGS ABOUT THIS OBJECT DOES NOT END THERE. THE FIRST AHS SAMPLES STUDIED SHOWED AN ANOMALOUS TYPE OF MATERIAL BELONGING TO THE CLASS OF UREILITE METERORITES.UREILITES ARE ONE OF THE LEAST UNDERSTOOD CLASSES OF PRIMITIVE ACHONDRITES AND ARGUABLY ONE OF THE MOST IMPORTANT FOR UNDERSTANDING EARLY SOLAR SYSTEM PROCESSES THAT BRIDGE THE CHONDRITE-TO-ACHONDRITE TRANSITION. THUS THE ADVENT OF A NEW TYPE OF UREILITE POTENTIALLYPROVIDING NEW INFORMATION IN THE FORM OF FRESH UNWEATHERED MATERIAL IS CERTAINLY WELCOME. ENSUING STUDIES OF MORE SAMPLES SHOWED A GREAT DIVERSITY OF UREILITE MATERIALS LEADING TO CLASSIFICATION OF AHS AS AN ANOMALOUS POLYMICT UREILITE. EVEN MORE REMARKABLY HOWEVER ~20-30% OF THE RECOVERED CLASTS WERE FOUND TO BE NON-UREILITIC INSTEAD REPRESENTING A VARIETY OF DIFFERENT CHONDRITE TYPES.THUS 2008 TC3/AHS APPEARS TO BE A NEW TYPE OF BRECCIA UNLIKE ANY METEORITE KNOWN TO DATE. NEVERTHELESS THERE ARE STRONG INDICATIONS THAT 2008 TC3/AHS "NORMAL" POLYMICT UREILITES AND MAIN GROUP UREILITES SHARE A COMMONLINEAGE. WE HYPOTHESIZE THAT THE IMMEDIATE PARENT OF 2008 TC3/AHS WAS ALSO THE IMMEDIATE PARENT OF ALL UREILITIC MATERIAL THAT HAS BEEN SAMPLED IN RECENT TIMES BY METEORITES ON EARTH AND THAT USING 2008 TC3/AHS AS A STARTING POINT WE CAN TRACE THE HISTORY OF THISMATERIAL BACK THROUGH MANY STAGES OF SOLAR SYSTEM HISTORY TO ACCRETION OF THE ORIGINAL UREILITE PARENT BODY. THE GOAL OF THE PROPOSED RESEARCH IS TO BRING OUR COMBINED EXPERTISE IN UREILITE PETROLOGY AND GEOCHEMISTRY ACCRETION MODELING ASTEROID DYNAMICS AND CRATERING AND REGOLITH EVOLUTION TO BEAR ON 4 MAJOR STAGES IN THE HISTORY OF UREILITIC MATERIAL IN THE SOLAR SYSTEM: 1) ACCRETION AND EARLY DIFFERENTIATION; 2) PARENT BODY BREAKUP AND FORMATION OF OFFSPRING BODIES; 3) DYNAMICAL EVOLUTION OF UREILITIC ASTEROIDS; AND 4) DEVELOPMENT OF A COMPLEX REGOLITH ON THE 2008 TC3 PARENT.

$300,643FY2014National Aeronautics and Space AdministrationNASA

Planetary Science Institute, Tucson AZ

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