权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Studies of Phobos polar illumination and thermal conditions

火卫一极地光照和热条件的研究

基本信息

批准号：
317685998
负责人：
Professor Dr. Jürgen Oberst
金额：
--
依托单位：
Institut für Geodäsie und Geoinformationstechnik
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2016
资助国家：
德国
起止时间：
2015-12-31 至 2019-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/317685998?language=en
关键词：
Studies Phobos polar illumination thermal

项目摘要

We will analyze data from Mars Express obtained from 2012-2015 to update the current shape and rotation parameters for Phobos. We then use the new shape and orientation models to investigate the illumination and thermal conditions of the polar areas of this small Martian satellite.Owing to the tilt of the rotation axis with respect to the orbital plane of the Mars system, the polar areas enjoy daylight for many months during the summer seasons. Owing to the odd shape of Phobos we expect intricate patterns of illuminated areas and shadows. We will produce illumination maps, which will be compared with distribution of sunlight and darkness in images to possibly identify potential for improvement of our shape and illumination model.We also study thermal conditions near the surface of Phobos as a result of incoming sunlight and thermal radiation from nearby Mars. Owing to the slightly elliptic solar orbit of Mars and its satellites, thermal cycles over the year are expected to be quite different on the Northern and Summer hemisphere. We also consider the effect of short eclipses (with Mars blocking incoming sunlight). Using numerical models of heat conduction and applicable soil parameters, we study the penetration depth of the diurnal and seasonal heat wave, for nearside, farside, polar and equatorial areas, to constrain the minimum depths of suggested water ice reservoirs within Phobos. Our project will support missions to Phobos, which are being planned in the coming years and it will greatly improve our understanding of the daily and seasonal cycle of changing environmental conditions for different geographic areas on this small satellite.

我们将分析从2012-2015年获得的火星快车数据，以更新火卫一当前的形状和旋转参数。然后，我们使用新的形状和方向的模型来调查的照明和热条件的极地地区的这颗小火星卫星，由于旋转轴相对于火星系统的轨道平面倾斜，极地地区享受日光在夏季的许多个月。由于火卫一的奇怪形状，我们预计照明区域和阴影的复杂图案。我们将制作照明图，并将其与图像中的阳光和黑暗分布进行比较，以确定我们的形状和照明模型的改进潜力。我们还将研究火卫一表面附近的热条件，这是由于来自附近火星的阳光和热辐射。由于火星及其卫星的太阳轨道略呈椭圆形，预计全年的热循环在北方和夏季半球会有很大的不同。我们还考虑了短食的影响（火星阻挡了入射的阳光）。利用热传导的数值模型和适用的土壤参数，我们研究了昼夜和季节性热浪的穿透深度，近侧，远侧，极地和赤道地区，以限制火卫一内建议的水冰水库的最小深度。我们的项目将支持未来几年计划的火卫一飞行任务，它将大大提高我们对这颗小卫星上不同地理区域环境条件变化的每日和季节周期的了解。