The surface composition and temperature of asteroid 21 lutetia as observed by Rosetta/VIRTIS

A. Coradini, F. Capaccioni, S. Erard, G. Arnold, M. C. De Sanctis, G. Filacchione, F. Tosi, M. A. Barucci, M. T. Capria, E. Ammannito, D. Grassi, G. Piccioni, S. Giuppi, G. Bellucci, J. Benkhoff, J. P. Bibring, A. Blanco, M. Blecka, D. Bockelee-Morvan, F. CarraroR. Carlson, U. Carsenty, P. Cerroni, L. Colangeli, M. Combes, M. Combi, J. Crovisier, P. Drossart, E. T. Encrenaz, C. Federico, U. Fink, S. Fonti, L. Giacomini, W. H. Ip, R. Jaumann, E. Kuehrt, Y. Langevin, G. Magni, T. McCord, V. Mennella, S. Mottola, G. Neukum, V. Orofino, P. Palumbo, U. Schade, B. Schmitt, F. Taylor, D. Tiphene, G. Tozzi

Research output: Contribution to journalArticle

83 Scopus citations

Abstract

The Visible, InfraRed, and Thermal Imaging Spectrometer (VIRTIS) on Rosetta obtained hyperspectral images, spectral reflectance maps, and temperature maps of the asteroid 21 Lutetia. No absorption features, of either silicates or hydrated minerals, have been detected across the observed area in the spectral range from 0.4 to 3.5 micrometers. The surface temperature reaches a maximum value of 245 kelvin and correlates well with topographic features. The thermal inertia is in the range from 20 to 30 joules meter-2 kelvin -1 second-0.5, comparable to a lunarlike powdery regolith. Spectral signatures of surface alteration, resulting from space weathering, seem to be missing. Lutetia is likely a remnant of the primordial planetesimal population, unaltered by differentiation processes and composed of chondritic materials of enstatitic or carbonaceous origin, dominated by iron-poor minerals that have not suffered aqueous alteration.

Original languageEnglish (US)
Pages (from-to)492-494
Number of pages3
JournalScience
Volume334
Issue number6055
DOIs
StatePublished - Oct 28 2011

ASJC Scopus subject areas

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    Coradini, A., Capaccioni, F., Erard, S., Arnold, G., De Sanctis, M. C., Filacchione, G., Tosi, F., Barucci, M. A., Capria, M. T., Ammannito, E., Grassi, D., Piccioni, G., Giuppi, S., Bellucci, G., Benkhoff, J., Bibring, J. P., Blanco, A., Blecka, M., Bockelee-Morvan, D., ... Tozzi, G. (2011). The surface composition and temperature of asteroid 21 lutetia as observed by Rosetta/VIRTIS. Science, 334(6055), 492-494. https://doi.org/10.1126/science.1204062