資料載入中.....
|
請使用永久網址來引用或連結此文件:
https://ir.lib.ncu.edu.tw/handle/987654321/101696
|
| 題名: | Orbital elements of the material surrounding comet 67P/Churyumov-Gerasimenko |
| 作者: | 葉永烜;Davidsson, B. J. R.;Gutiérrez, P. J.;Sierks, H.;Barbieri, C.;Lamy, P. L.;Rodrigo, R.;Koschny, D.;Rickman, H.;Keller, H. U.;Agarwal, J.;A’Hearn, M. F.;Barucci, M. A.;Bertaux, J.-L.;Bertini, I.;Bodewits, D.;Cremonese, G.;Da Deppo, V.;Debei, S.;De Cecco, M.;Fornasier, S.;Fulle, M.;Groussin, O.;Güttler, C.;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.;Lopez Moreno, J. J.;Lowry, S.;Magrin, S.;Marzari, F.;Michalik, H.;Moissl-Fraund, R.;Naletto, G.;Oklay, N.;Pajola, M.;Snodgrass, C.;Thomas, N.;Tubiana, C.;Vincent, J.-B. |
| 貢獻者: | 理學院天文研究所 |
| 關鍵詞: | astrometry;Astronomy and Astrophysics;Astrophysics;celestial mechanics;Clouds;Comet heads;Comet nuclei;Comets;comets: individual: 67P/Churyumov-Gerasimenko;Earth and Planetary Astrophysics;Grains;Orbital elements;Orbits;Photometry;Sciences of the Universe;Space and Planetary Science |
| 日期: | 2015-11-01 |
| 上傳時間: | 2026-04-21 14:41:06 (UTC+8) |
| 出版者: | EDP Sciences |
| 摘要: | 摘要： Context. We investigate the dust coma within the Hill sphere of comet 67P/Churyumov-Gerasimenko. Aims. We aim to determine osculating orbital elements for individual distinguishable but unresolved slow-moving grains in the vicinity of the nucleus. In addition, we perform photometry and constrain grain sizes. Methods. We performed astrometry and photometry using images acquired by the OSIRIS Wide Angle Camera on the European Space Agency spacecraft Rosetta. Based on these measurements, we employed standard orbit determination and orbit improvement techniques. Results. Orbital elements and effective diameters of four grains were constrained, but we were unable to uniquely determine them. Two of the grains have light curves that indicate grain rotation. Conclusions. The four grains have diameters nominally in the range 0.14–0.50 m. For three of the grains, we found elliptic orbits, which is consistent with a cloud of bound particles around the nucleus. However, hyperbolic escape trajectories cannot be excluded for any of the grains, and for one grain this is the only known option. One grain may have originated from the surface shortly before observation. These results have possible implications for the understanding of the dispersal of the cloud of bound debris around comet nuclei, as well as for understanding the ejection of large grains far from the Sun.
出版者： EDP Sciences
出版日期： 2015-11-01
出處： Astronomy & Astrophysics, 2015-11, Vol.583, p.A16-
資源來源： EDP Sciences
版權： CC0 1.0 - Universal
識別號： ISSN: 0004-6361
識別號： ISSN: 1432-0746
識別號： EISSN: 1432-0746
識別號： DOI: 10.1051/0004-6361/201525841 |
| 顯示於類別: | [天文研究所] 期刊論文
|
文件中的檔案:
| 檔案 |
描述 |
大小 | 格式 | 瀏覽次數 |
|---|
| index.html | | 0Kb | HTML | 13 | 檢視/開啟 |
|
在NCUIR中所有的資料項目都受到原著作權保護.
|
