Astrometry is one of the main pillars of astronomy, and one of its oldest branches. Over the years, an increasing number of astrometric works by means of Hubble Space Telescope (HST) data have revolutionized our understanding of various phenomena. With the launch of JWST, it becomes almost instinctive to want to replicate or improve these results with data taken with the newest, state-of-the-art, space-based telescope. In this regard, the initial focus of the community has been on the Near-Infrared detectors on board of JWST because of their high spatial resolution. This paper begins the effort to capture and apply what has been learned from HST to the Mid-InfraRed Instrument (MIRI) of JWST by developing the tools to obtain high-precision astrometry and photometry with its imager. We describe in detail how to create accurate effective point-spread-function (ePSF) models and geometric-distortion corrections, analyze their temporal stability, and test their quality to the extent of what is currently possible with the available data in the JWST MAST archive. We show that careful data reduction provides deep insight on the performance and intricacies of the MIRI imager, and of JWST in general. In an effort to help the community devise new observing programs, we make our ePSF models and geometric-distortion corrections publicly available.

中文翻译：

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使用 JWST/MIRI 成像仪进行高精度天体测量和光度测量

天体测量学是天文学的主要支柱之一，也是其最古老的分支之一。多年来，越来越多的利用哈勃太空望远镜（HST）数据进行的天体测量工作彻底改变了我们对各种现象的理解。随着 JWST 的发射，人们几乎本能地想要利用最新、最先进的天基望远镜获取的数据来复制或改进这些结果。在这方面，社区最初的关注点是 JWST 上的近红外探测器，因为它们具有高空间分辨率。本文开始努力捕捉 HST 的知识并将其应用到 JWST 的中红外仪器 (MIRI)，开发工具以通过其成像仪获得高精度天体测量和光度测量。我们详细描述了如何创建准确的有效点扩散函数 (ePSF) 模型和几何畸变校正，分析其时间稳定性，并在 JWST MAST 档案中的可用数据当前可能的范围内测试其质量。我们表明，仔细的数据缩减可以深入了解 MIRI 成像仪和 JWST 的性能和复杂性。为了帮助社区设计新的观测计划，我们公开了 ePSF 模型和几何畸变校正。