arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.09289astro-ph.IMcs.SYeess.SY
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用于X射线观测的虚拟望远镜

Virtual Telescope for X-Ray Observations

Kyle Rankin, John Krizmanic, Neerav Shah, Steven Stochaj, Asal Naseri

摘要:

由美国宇航局选择的天体物理科学小卫星研究,虚拟望远镜的X射线观测(VTXO)是一个小卫星任务正在开发的美国宇航局戈达德太空飞行中心(GSFC)和新墨西哥州立大学(NMSU)。VTXO将进行X射线观测,其角分辨率约为50毫角秒,比目前最先进的X射线望远镜所能达到的分辨率高一个数量级。VTXO的高角分辨率使其能够在紧凑型X射线源中测量更靠近中央引擎的环境。该分辨率将通过使用相位菲涅尔透镜(PFL)光学器件来实现,该相位菲涅尔透镜(PFL)光学器件在X射线波段中提供近衍射极限成像。然而,PFL需要长焦距以实现其成像性能,对于VTXO,这要求望远镜光学器件和相机将具有1 km的间隔。由于在太空中建造如此大的结构是不现实的,因此适用于VTXO的解决方案是将相机和光学器件放置在两个独立的航天器上,并以必要的间距编队飞行。这需要厘米级的控制,和亚毫米级的两个航天器的相对横向位置的知识。本文将介绍VTXO目前的基线,特别强调飞行任务的飞行动力学设计。

英文摘要:

Selected by NASA for an Astrophysics Science SmallSat study, The Virtual Telescope for X-Ray Observations (VTXO) is a small satellite mission being developed by NASAs Goddard Space Flight Center (GSFC) and New Mexico State University (NMSU). VTXO will perform X-ray observations with an angular resolution around 50 milliarcseconds, an order of magnitude better than is achievable by current state of the art X-ray telescopes. VTXOs fine angular resolution enables measuring the environments closer to the central engines in compact X-ray sources. This resolution will be achieved by the use of Phased Fresnel Lenses (PFLs) optics which provide near diffraction-limited imaging in the X-ray band. However, PFLs require long focal lengths in order to realize their imaging performance, for VTXO this dictates that the telescopes optics and the camera will have a separation of 1 km. As it is not realistic to build a structure this large in space, the solution being adapted for VTXO is to place the camera, and the optics on two separate spacecraft and fly them in formation with the necessary spacing. This requires centimeter level control, and sub-millimeter level knowledge of the two spacecrafts relative transverse position. This paper will present VTXOs current baseline, with particular emphasis on the missions flight dynamics design.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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