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| 題名: | On the nucleus structure and activity of comet 67P/Churyumov-Gerasimenko |
| 作者: | 葉永烜;Sierks, H.;Barbieri, C.;Lamy, P. L.;Rodrigo, R.;Koschny, D.;Rickman, H.;Keller, H. U.;Agarwal, J.;A'Hearn, M. F.;Angrilli, F.;Auger, A.-T.;Barucci, M. A.;Bertaux, J.-L.;Bertini, I.;Besse, S.;Bodewits, D.;Capanna, C.;Cremonese, G.;Da Deppo, V.;Davidsson, B.;Debei, S.;De Cecco, M.;Ferri, F.;Fornasier, S.;Fulle, M.;Gaskell, R.;Giacomini, L.;Groussin, O.;Gutierrez-Marques, P.;Gutiérrez, P. J.;Güttler, C.;Hoekzema, N.;Hviid, S. F.;Ip, W.-H.;Jorda, L.;Knollenberg, J.;Kovacs, G.;Kramm, J.-R.;Kührt, E.;Küppers, M.;La Forgia, F.;Lara, L. M.;Lazzarin, M.;Leyrat, C.;Moreno, J. J. Lopez;Magrin, S.;Marchi, S.;Marzari, F.;Massironi, M.;Michalik, H.;Moissl, R.;Mottola, S.;Naletto, G.;Oklay, N.;Pajola, M.;Pertile, M.;Preusker, F.;Sabau, L.;Scholten, F.;Snodgrass, C.;Thomas, N.;Tubiana, C.;Vincent, J.-B.;Wenzel, K.-P.;Zaccariotto, M.;Pätzold, M. |
| 貢獻者: | 理學院天文研究所 |
| 關鍵詞: | Astrophysics;bulk density;Comet nuclei;Comets;Earth and Planetary Astrophysics;image analysis;Imaging;Lobes;mass;momentum;Morphology;Necks;Nuclei;Onboard;Planetology;RESEARCH ARTICLE ABSTRACTS;Sciences of the Universe;Sublimation |
| 日期: | 2015-01-23 |
| 上傳時間: | 2026-04-21 14:32:17 (UTC+8) |
| 出版者: | American Association for the Advancement of Science;Washington: American Association for the Advancement of Science (AAAS) |
| 摘要: | 摘要： Images from the OSIRIS scientific imaging system onboard Rosetta show that the nucleus of 67P/Churyumov-Gerasimenko consists of two lobes connected by a short neck. The nucleus has a bulk density less than half that of water. Activity at a distance from the Sun of >3 astronomical units is predominantly from the neck, where jets have been seen consistently. The nucleus rotates about the principal axis of momentum. The surface morphology suggests that the removal of larger volumes of material, possibly via explosive release of subsurface pressure or via creation of overhangs by sublimation, may be a major mass loss process. The shape raises the question of whether the two lobes represent a contact binary formed 4.5 billion years ago, or a single body where a gap has evolved via mass loss.
出版者： Washington: American Association for the Advancement of Science (AAAS)
出版日期： 2015-01-23
出處： Science, 2015-01, Vol.347 (6220), p.1044--389
資源來源： American Association for the Advancement of Science
版權： Copyright © 2015 American Association for the Advancement of Science
版權： Copyright © 2015, American Association for the Advancement of Science
版權： CC0 1.0 - Universal
識別號： ISSN: 0036-8075
識別號： ISSN: 1095-9203
識別號： EISSN: 1095-9203
識別號： DOI: 10.1126/science.aaa1044
識別號： CODEN: SCIEAS |
| 顯示於類別: | [天文研究所] 期刊論文
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