RT Conference Proceedings
T1 Ir reflectante spectra of Antartic carbonaceous chondrites to better characterize the surfaces of asteroids targetted by sample return missions
A1 Trigo Rodríguez, Josep María
A1 Llorca, Jordi
A1 Madiedo Gil, José María
A1 Alonso Azcárate, Jacinto
A1 Rivkin, A. S.
A1 Fornasier, S.
A1 Belskaya, I.
A1 Binzel, R.
A1 Moyano Cambero, Carles E.
A1 Dergham, J.
A1 Cortés, J.
AB Undifferentiated carbonaceous asteroidshave experienced complex collisional histories,and a significant number are fragments of larger bodies.Meteorites arrived from these asteroids exhibit anamazing reflectance spectra diversity [1-3]. These asteroidsare now in the focus of several sample returnmissions due to the astrobiological relevance of theirexploration [4, 5]. In meteorite collections the rocksdelivered from these fascinating asteroids are calledcarbonaceous chondrites (hereafter CCs). Impacts onthese asteroids mixed together materials with differentcompositions and alteration histories. Due to their lowbulk densities and porous nature the collisions withother bodies resulted in heavy fragmentation and brecciationof their surfaces. In fact, it is now being recognizedthat most of the identified CCs in terrestrial collectionsare breccias characterized by having clasts ofdifferent lithologies [6]. Carbonaceous asteroids deliveredto the NEO region by dynamic resonances, as theselected targets of Marco Polo-R and Osiris-Rex missions,cannot be considered an exception. Theyevolved through the Main Belt as a consequence ofnon-gravitational effects, and in their long journeyuntil becoming a NEO could have experienced spaceweathering processes changing significantly their reflectanceproperties. Chemical evidence indicates thatthe number of carbonaceous asteroids sampled is lowerthan twenty. Among them, some are represented byungrouped and extremely rare CCs that are only availablethanks to the Antarctic recovery effort made bydifferent teams during the last decades. Due to this wehave started a project to increase the number of highresolution reflectance spectra of CCs, with three maingoals: 1) To identify the main features that could beused for remote characterization of their parent bodies;2) To analyze the relevance of grain size in the reflectancespectra and exemplify its influence in regolithcoveredcarbonaceous asteroids, and 3) To performexperiments to simulate space weathering processesand their influence in the reflectance properties ofprimitive bodies
YR 2012
FD 2012
LK http://hdl.handle.net/10272/9215
UL http://hdl.handle.net/10272/9215
LA eng
DS Repositorio Institucional de la Universidad de Huelva
RD 30 may 2026