Multiple asteroid systems (45) Eugenia and (87) Sylvia: Sensitivity to external and internal perturbations
文献类型：期刊论文
| 作者 | Beauvalet, L.1,2; Marchis, F.2,3 |
| 刊名 | ICARUS
 |
| 出版日期 | 2014-10-01 |
| 卷号 | 241页码:13-25 |
| 关键词 | Asteroids Asteroids Celestial mechanics Orbit determination Satellites of asteroids dynamics |
| 英文摘要 | Satellites of asteroids are a widely used way to determine the masses and other dynamical parameters of their systems. We make such a determination here, using data from the two triple-asteroid systems, (45) Eugenia and (87) Sylvia, that come from the Hubble Space Telescope and adaptive optics on three 8-10 m class telescopes (Keck, VLT, Gemini North). First, we determined what set of parameters can be precisely derived from a limited number of observations. Next, we deduced constraints on the inner structure of the main body of the systems. To do this, we fit our dynamical model ODIN to simulated observations to determine at what confidence level we can constrain the dynamical parameters. We deduced that the mass of the satellites is too small to be fitted with confidence, while the polar oblateness J(2) of the primary can be constrained. Then, ODIN was fitted to observations of the systems to obtain the values of the polar oblateness J(2). The difference between the theoretical value of J(2), and our estimate deduced from the motion of the satellites, suggests that Eugenia is differentiated. We explore the properties needed by a dense and spherical core, surrounded by a less dense layer, to explain this difference. The lack of agreement between the different dynamical studies of Sylvia prevents us from making any definitive conclusion, but the large range of possible solutions points to an interesting inner structure. (C) 2014 Elsevier Inc. All rights reserved. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | ADAPTIVE-OPTICS SYSTEM ; ORBITS ; BELT ; SATELLITES ; PERFORMANCE ; CONSTRAINTS ; PLANET ; MASSES ; PLUTO |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000343617900002 |
| 源URL | [http://119.78.226.72/handle/331011/18190]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 2.CNRS, UMR8028, IMCCE Observ Paris, F-75014 Paris, France 3.Carl Sagan Ctr, SETI Inst, Mountain View, CA 94043 USA |
| 推荐引用方式 GB/T 7714 | Beauvalet, L.,Marchis, F.. Multiple asteroid systems (45) Eugenia and (87) Sylvia: Sensitivity to external and internal perturbations[J]. ICARUS,2014,241:13-25. |
| APA | Beauvalet, L.,&Marchis, F..(2014).Multiple asteroid systems (45) Eugenia and (87) Sylvia: Sensitivity to external and internal perturbations.ICARUS,241,13-25. |
| MLA | Beauvalet, L.,et al."Multiple asteroid systems (45) Eugenia and (87) Sylvia: Sensitivity to external and internal perturbations".ICARUS 241(2014):13-25. |
入库方式： OAI收割
来源：上海天文台
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