Geomorphology and spectrophotometry of Philae's landing site on comet 67P/Churyumov-Gerasimenko

NCU Institutional Repository > 理學院 > 天文研究所 > 期刊論文 > Item 987654321/101653

jsp.display-item.identifier=請使用永久網址來引用或連結此文件: https://ir.lib.ncu.edu.tw/handle/987654321/101653

题名:	Geomorphology and spectrophotometry of Philae's landing site on comet 67P/Churyumov-Gerasimenko
作者:	葉永烜;La Forgia, F.;Giacomini, L.;Lazzarin, M.;Massironi, M.;Oklay, N.;Scholten, F.;Pajola, M.;Bertini, I.;Cremonese, G.;Barbieri, C.;Naletto, G.;Simioni, E.;Preusker, F.;Thomas, N.;Sierks, H.;Lamy, P.;Rodrigo, R.;Koschny, D.;Rickman, H.;Keller, H. U.;Agarwal, J.;Auger, A.-T.;A’Hearn, M. F.;Barucci, M. A.;Bertaux, J.-L.;Besse, S.;Bodewits, D.;Da Deppo, V.;Davidsson, B.;Debei, S.;De Cecco, M.;El-Maarry, M. R.;Ferri, F.;Fornasier, S.;Fulle, M.;Groussin, O.;Gutiérrez, P. J.;Güttler, C.;Hall, I.;Hviid, S. F.;Ip, W.-H.;Jorda, L.;Knollenberg, J.;Kramm, J. R.;Kührt, E.;Küppers, M.;Lara, L.-M.;Lopez Moreno, J. J.;Magrin, S.;Marzari, F.;Michalik, H.;Mottola, S.;Pommerol, A.;Tubiana, C.;Vincent, J.-B.
贡献者:	理學院天文研究所
关键词:	Astrophysics;Comets;comets: general;comets: individual: 67P/Churyumov-Gerasimenko;Earth and Planetary Astrophysics;Geomorphology;Landing sites;methods: data analysis;Physics;Rosetta mission;Sciences of the Universe;Slopes;Solar system;Spectra;Spectrophotometry;techniques: photometric
日期:	2015-11-01
上传时间:	2026-04-21 14:40:08 (UTC+8)
出版者:	EDP Sciences
摘要:	摘要： Context. On 12 November 2014 the European mission Rosetta succeeded in delivering a lander, named Philae, on the surface of one of the smallest, low-gravity and most primitive bodies of the solar system, the comet 67P/Churyumov-Gerasimenko (67P). Aims. The aim of this paper is to provide a comprehensive geomorphological and spectrophotometric analysis of Philae’s landing site (Agilkia) to give an essential framework for the interpretation of its in situ measurements. Methods. OSIRIS images, coupled with gravitational slopes derived from the 3D shape model based on stereo-photogrammetry were used to interpret the geomorphology of the site. We adopted the Hapke model, using previously derived parameters, to photometrically correct the images in orange filter (649.2 nm). The best approximation to the Hapke model, given by the Akimov parameter-less function, was used to correct the reflectance for the effects of viewing and illumination conditions in the other filters. Spectral analyses on coregistered color cubes were used to retrieve spectrophotometric properties. Results. The landing site shows an average normal albedo of 6.7% in the orange filter with variations of ~15% and a global featureless spectrum with an average red spectral slope of 15.2%/100 nm between 480.7 nm (blue filter) and 882.1 nm (near-IR filter). The spatial analysis shows a well-established correlation between the geomorphological units and the photometric characteristics of the surface. In particular, smooth deposits have the highest reflectance a bluer spectrum than the outcropping material across the area. Conclusions. The featureless spectrum and the redness of the material are compatible with the results by other instruments that have suggested an organic composition. The observed small spectral variegation could be due to grain size effects. However, the combination of photometric and spectral variegation suggests that a compositional differentiation is more likely. This might be tentatively interpreted as the effect of the efficient dust-transport processes acting on 67P. High-activity regions might be the original sources for smooth fine-grained materials that then covered Agilkia as a consequence of airfall of residual material. More observations performed by OSIRIS as the comet approaches the Sun would help interpreting the processes that work at shaping the landing site and the overall nucleus. 出版者： EDP Sciences 出版日期： 2015-11-01 出處： Astronomy and astrophysics (Berlin), 2015-11, Vol.583, p.A41 資源來源： EDP Sciences 版權： licence_http://creativecommons.org/publicdomain/zero 識別號： ISSN: 0004-6361 識別號： ISSN: 1432-0746 識別號： EISSN: 1432-0746 識別號： DOI: 10.1051/0004-6361/201525983
显示于类别:	[天文研究所] 期刊論文

文件中的档案:

档案	描述	大小	格式	浏览次数
index.html		0Kb	HTML	19	检视/开启

在NCUIR中所有的数据项都受到原著作权保护.

社群 sharing

数据加载中.....