RUI: Radar Studies of Carbonaceous Mainbelt Asteroids

RUI：碳质主带小行星的雷达研究

• 批准号: 9973216
• 负责人: Christopher Magri
• 金额: $ 6.87万
• 依托单位: University of Maine Farmington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-08-01 至 2002-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9973216&HistoricalAwards=false
• 关键词: RUI; Radar; Studies; Carbonaceous; Mainbelt

Abstract - Christopher Magri AST 9973216This observational program will make use of the newly upgraded radar system at the Arecibo Observatory in Puerto Rico to study carbonaceous mainbelt asteroids (MBAs). Carbonaceous asteroids are thought to be relatively unaltered from the primordial solids that condensed in the outer solar nebula. The outermost asteroids probably have complex organic molecules on their surfaces. The radar-derived data will be used to set constraints on target shape, topography, rotation state, composition, and near-surface roughness to define similarities and differences between the various taxonomic classes containing dark objects and between carbonaceous MBAs and other asteroids. The project is a logical outgrowth of recent statistical analysis of all MBAs detected by radar prior to the Arecibo upgrade. Many asteroid targets will be detected at moderate signal-to-noise ratio (SNR) using Doppler-only (continuous wave) techniques. These first-time detections will be used to build up data samples within each of the carbonaceous taxonomic classes. A smaller number of targets will produce echoes with high enough SNR that time-resolved signals can profitably be utilized. The "delay-Doppler" images that result from binning the echo, both by arrival time and by frequency, will be used as the input to shape-modeling analyses. The analyses will yield constraints on the target's pole-on silhouette for datasets with SNR approaching 100, and can also involve three-dimensional shape reconstruction for SNR values of several hundreds. The software tools to be used will include both commercial packages and radar-specific programs developed by a research group at the Jet Propulsion Laboratory.

摘要- Christopher Magri AST 9973216该观测计划将利用波多黎各阿雷西博天文台新升级的雷达系统来研究碳质主带小行星（MBA）。碳质小行星被认为是相对不变的原始固体，凝聚在太阳星云的外层。 最外层的小行星表面可能有复杂的有机分子。 雷达获得的数据将用于对目标形状、地形、旋转状态、组成和近表面粗糙度设定限制，以确定包含暗天体的各种分类类别之间以及碳质MBAs和其他小行星之间的相似性和差异。该项目是最近对阿雷西博升级之前雷达探测到的所有MBA进行统计分析的逻辑结果。许多小行星目标将使用仅多普勒（连续波）技术以中等信噪比探测。这些首次检测将用于建立每个碳质分类类别内的数据样本。较少数量的目标将产生具有足够高的SNR的回波，从而可以有利地利用时间分辨信号。通过按到达时间和频率对回波进行分箱得到的“延迟多普勒”图像将用作形状建模分析的输入。该分析将产生对SNR接近100的数据集的目标的极点轮廓的约束，并且还可以涉及SNR值为几百的三维形状重建。 将使用的软件工具将包括商业软件包和喷气推进实验室的一个研究小组开发的雷达专用程序。