2024-03-28T17:43:26Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1674362022-03-29T10:32:52Zcom_10261_44com_10261_4com_10261_97col_10261_297col_10261_350
2018-07-09T06:34:07Z
urn:hdl:10261/167436
Opposition effect on comet 67P/Churyumov-Gerasimenko using Rosetta-OSIRIS images
Masoumzadeh, N.
Oklay, N.
Kolokolova, L.
Sierks, H.
Fornasier, S.
Barucci, M.A.
Vincent, J.B.
Tubiana, C.
Güttler, C.
Preusker, F.
Scholten, F.
Mottola, S.
Hasselmann, P.H.
Feller, C.
Barbieri, C.
Lamy, P.L.
Rodrigo Montero, Rafael
Koschny, D.
Rickman, H.
A'Hearn, M. F.
Bertaux, J.L.
Bertini, I.
Cremonese, G.
Da Deppo, V.
Davidsson, Björn J. R.
Debei, S.
De Cecco, M.
Fulle, M.
Gicquel, A.
Groussin, O.
Gutiérrez, Pedro J.
Hall, I.
Hofmann, M.
Hviid, S.F.
Ip, W. H.
Jorda, L.
Keller, H.U.
Knollenberg, J.
Kovacs, G.
Kramm, J.R.
Kührt, E.
Küppers, M.
Lara, Luisa María
Lazzarin, M.
López-Moreno, José Juan
Marzari, F.
Naletto, G.
Shi, X.
Thomas, N.
Swedish National Space Board
Ministerio de Economía y Competitividad (España)
Agenzia Spaziale Italiana
Centre National de la Recherche Scientifique (France)
German Centre for Air and Space Travel
European Space Agency
Gerasimenko
Techniques: photometric
Planets and satellites: surfaces
Comets: individual: 67P/Churyumov
Aims. We aim to explore the behavior of the opposition effect as an important tool in optical remote sensing on the nucleus of comet 67P/Churyumov-Gerasimenko (67P), using Rosetta-OSIRIS images acquired in different filters during the approach phase, July-August 2014 and the close flyby images on 14 of February 2015, which contain the spacecraft shadow. Methods. We based our investigation on the global and local brightness from the surface of 67P with respect to the phase angle, also known as phase curve. The local phase curve corresponds to a region that is located at the Imhotep-Ash boundary of 67P. Assuming that the region at the Imhotep-Ash boundary and the entire nucleus have similar albedo, we combined the global and local phase curves to study the opposition-surge morphology and constrain the structure and properties of 67P. The model parameters were furthermore compared with other bodies in the solar system and existing laboratory study. Results. We found that the morphological parameters of the opposition surge decrease monotonically with wavelength, whereas in the case of coherent backscattering this behavior should be the reverse. The results from comparative analysis place 67P in the same category as the two Mars satellites, Phobos and Deimos, which are notably different from all airless bodies in the solar system. The similarity between the surface phase function of 67P and a carbon soot sample at extremely small angles is identified, introducing regolith at the boundary of the Imhotep-Ash region of 67P as a very dark and fluffy layer.© ESO, 2017.
2018-07-09T06:34:07Z
2018-07-09T06:34:07Z
2017
2018-07-09T06:34:08Z
artículo
Astronomy and Astrophysics 599: A11 (2017)
http://hdl.handle.net/10261/167436
10.1051/0004-6361/201629734
http://dx.doi.org/10.13039/501100004794
http://dx.doi.org/10.13039/501100001859
http://dx.doi.org/10.13039/501100003329
http://dx.doi.org/10.13039/501100003981
http://dx.doi.org/10.13039/501100002946
http://dx.doi.org/10.13039/501100000844
eng
Publisher's version
Sí
openAccess
EDP Sciences