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Capaccioni, F.; Coradini, A.; Filacchione, G.; Erard, S.; Arnold, G.; Drossart, P.; De Sanctis, M. C.; Bockelee-Morvan, D.; Capria, M. T.; Tosi, F.; Leyrat, C.; Schmitt, B.; Quirico, E.; Cerroni, P.; Mennella, V.; Raponi, A.; Ciarniello, M.; MeCord, T.; Moroz, L.; Palomba, E.; Ammannito, E.; Barucci, M. A.; Bellucci, G.; Benkhoff, J.; Bibring, J. P.; Blanco, A.; Blecka, M.; Carlson, R.; Carsenty, U.; Colangeli, L.; Combes, M.; Combi, M.; Crovisier, J.; Encrenaz, T.; Federico, C.; Fink, U.; Fonti, S.; Ip, W. H.; Irwin, P.; Jaumann, R.; Kuehrt, E.; Langevin, Y.; Magni, G.; Mottola, S.; Orofino, V.; Palumbo, P.; Piccioni, G.; Schade, U.; Taylor, F.; Tiphene, D.; Tozzi, G. P.; Beck, P.; Biver, N.; Bonal, L.; Combe, J.-Ph; Despan, D.; Flamini, E.; Fornasier, S.; Frigeri, A.; Grassi, D.; Gudipati, M.; Longobardo, A.; Markus, K.; Merlin, F.; Orosei, R.; Rinaldi, G.; Stephan, K.; Cartacci, M.; Cicchetti, A.; Giuppi, S.; Hello, Y.; Henry, F.; Jacquinod, S.; Noschese, R.; Peter, G.; Politi, R.; Reess, J. M.; Semery, A.
Science (American Association for the Advancement of Science), 01/2015, Letnik: 347, Številka: 6220Journal Article
The VIRTIS (Visible, Infrared and Thermal Imaging Spectrometer) instrument on board the Rosetta spacecraft has provided evidence of carbon-bearing compounds on the nucleus of the comet 67P/Churyumov-Gerasimenko. The very low reflectance of the nucleus (normal albedo of 0.060 ± 0.003 at 0.55 micrometers), the spectral slopes in visible and infrared ranges (5 to 25 and 1.5 to 5% kÅ −1 ), and the broad absorption feature in the 2.9-to-3.6–micrometer range present across the entire illuminated surface are compatible with opaque minerals associated with nonvolatile organic macromolecular materials: a complex mixture of various types of carbon-hydrogen and/or oxygen-hydrogen chemical groups, with little contribution of nitrogen-hydrogen groups. In active areas, the changes in spectral slope and absorption feature width may suggest small amounts of water-ice. However, no ice-rich patches are observed, indicating a generally dehydrated nature for the surface currently illuminated by the Sun.
