The Foreign Clast Populations of Anomalous Polymict Urelite Almahata Sitta (Asteroid 2008 TC(sub3) and Typical Polymict Ureilites: Implications for Asteroid-Meteorite ConnectionsAlmahata Sitta (AhS) is the first meteorite to originate from an asteroid (2008 TC3) that had been studied in space before it hit Earth [1,2]. It is also unique because the fallen fragments comprise a variety of types: approximately 69% ureilites (achondrites) and 31% chondrites [3]. Two models have been proposed for the origin 2008 TC3: 1) an accretionary model [3,4]; or 2) a regolith model [5,6]. Typical polymict ureilites are interpreted to represent regolith, and contain a few % foreign clasts [7,8]. The most common are dark (CC matrix-like) clasts similar to those in many meteoritic breccias [9]. A variety of other chondrites, as well as achondrites (angrites), have also been reported [7,9,10]. We have been working to determine the full diversity of these clasts [10-13] for comparison with AhS. We discuss implications for mixing of materials in the early solar system and the origin of 2008 TC3.
Document ID
20160005081
Acquisition Source
Johnson Space Center
Document Type
Abstract
Authors
Goodrich, C. A. (Lunar and Planetary Inst. Houston, TX, United States)
Treiman, A. H. (Lunar and Planetary Inst. Houston, TX, United States)
Zolensky, M. (NASA Johnson Space Center Houston, TX, United States)
Kita, N. T. (Wisconsin-Madison Univ. Madison, WI, United States)
Defouilloy, C. (Wisconsin-Madison Univ. Madison, WI, United States)
Fioretti, A. M. (Consiglio Nazionale della Ricerche Torino, Italy)
O'Brien, D. P. (Planetary Science Inst. Tucson, AZ, United States)
Jenniskens, P. (Search for Extraterrestrial Intelligence Inst. Mountain View, CA, United States)