Object cross-identification in multiple observations is often complicated by the uncertainties in their astrometric calibration. Due to the lack of standard reference objects, an image with a small field of view can have significantly larger errors in its absolute positioning than the relative precision of the detected sources within. We present a new general solution for the relative astrometry that quickly refines the World Coordinate System of overlapping fields. The efficiency is obtained through the use of infinitesimal 3-D rotations on the celestial sphere, which do not involve trigonometric functions. They also enable an analytic solution to an important step in making the astrometric corrections. In cases with many overlapping images, the correct identification of detections that match together across different images is difficult to determine. We describe a new greedy Bayesian approach for selecting the best object matches across a large number of overlapping images. The methods are developed and demonstrated on the Hubble Legacy Archive, one of the most challenging data sets today. We describe a novel catalog compiled from many Hubble Space Telescope observations, where the detections are combined into a searchable collection of matches that link the individual detections. The matches provide descriptions of astronomical objects involving multiple wavelengths and epochs. High relative positional accuracy of objects is achieved across the Hubble images, often sub-pixel precision in the order of just a few milli-arcseconds. The result is a reliable set of high-quality associations that are publicly available online.
SIMLA: The Spitzer Infrared Spectrograph Mapping Legacy Archive
University of Toledo（托莱多大学）；University of California, San Diego（加州大学圣地亚哥分校）；University of Texas at Arlington（德克萨斯大学阿灵顿分校）；Jet Propulsion Laboratory, California Institute of Technology（加州理工学院喷气推进实验室）
The Stellar Observations Network Group (SONG) -- A Legacy Archive of Stellar Time-Domain Spectroscopy
Aarhus University（奥胡斯大学）；Instituto de Astrofísica de Canarias（加那利天体物理学研究所）；Universidad de La Laguna (ULL)（拉帕鲁纳大学）；University of Southern Queensland（南昆士兰大学）；National Astronomical Observatories, Chinese Academy of Sciences（中国科学院国家天文台）；China West Normal University（西华师范大学）
ALICE Data Release: A revaluation of HST-NICMOS coronagraphic images
从1997年到2008年，哈勃太空望远镜的NICMOS仪器对大约400个目标进行了日冕观测。其中大多数是寻找亚恒星同伴或解决拱星盘到年轻的附近恒星的调查的一部分，使NICMOS日冕档案成为系外行星和盘研究的宝贵数据库。作为星际环境档案遗产调查（ALICE）计划的一部分，我们一直在使用先进的PSF减法方法重新处理NICMOS日冕档案的很大一部分。我们在这里展示了这些重新分析数据的高水平科学产品，我们通过Mikulski Archive for Space Telescopes（MAST）http://dx.doi.org/10.17909/T9W89V将这些产品提供给社区。我们还介绍了HCI-FITS格式的第二个版本（用于高对比度成像FITS格式），该格式是我们开发的用于成像简化科学产品数据交换的标准格式。这些重新分析的产品可公开用于群体统计研究、特定目标的表征或检测到的点源识别。
Effects of diffuse background emission and source crowding on photometric completeness in Spitzer Space Telescope IRAC surveys: The GLIMPSE Catalogs and Archives
Automated Shape-Model-Based Astrometry of Phobos from Mars Express SRC Images
Jinan University（暨南大学）；Sino-French Joint Laboratory for Astrometry, Dynamics and Space Science, Jinan University（暨南大学中法天体力学与空间科学联合实验室）；Shanghai Astronomical Observatory, Chinese Academy of Sciences（中国科学院上海天文台）；Institute for Advanced Study, Shenzhen University（深圳大学高等研究院）；School of Computer Science, Northwestern Polytechnical University（西北工业大学计算机学院）
Detecting and Characterizing Companions with a Calibrated Gaia DR2, DR3, and Hipparcos Catalog (G23H)
NRC Herzberg Astronomy and Astrophysics（国家研究委员会赫茨伯格天文学与天体物理学研究所）；Department of Physics and Astronomy, University of Victoria（维多利亚大学物理与天文系）；Heising-Simons Foundation（海辛-西蒙斯基金会）；Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles（加州大学洛杉矶分校地球、行星与空间科学系）；Department of Physics, University of California, Santa Barbara（加州大学圣塔芭芭拉分校物理系）；Department of Astronomy & Astrophysics, University of California, San Diego（加州大学圣地亚哥分校天文与天体物理学系）；Department of Astronomy, New Mexico State University（新墨西哥州立大学天文系）
