The PHASES Differential Astrometry Data Archive IV: The Triple Star Systems 63 Gem A and HR 2896
Matthew W. Muterspaugh, Francis C. Fekel, Benjamin F. Lane, William I. Hartkopf, S. R. Kulkarni, Maciej Konacki, Bernard F. Burke, M. M. Colavita, M. Shao, M. Williamson
(Abridged) Differential astrometry measurements from the Palomar High-precision Astrometric Search for Exoplanet Systems (PHASES) are used to constrain the astrometric orbit of the previously known lesssim 2 day subsystem in the triple system 63 Gem A and have detected a previously unknown 2 year Keplerian wobble superimposed on the visual orbit of the much longer period (213 years) binary system HR 2896. The very small astrometric perturbation caused by the inner pair in 63 Gem A stretches the limits of current astrometric capabilities, but PHASES observations are able to constrain the orientation of the orbit. The two bright stars comprising the HR 2896 long period (213 year) system have a combined spectral type of K0III and the newly detected object's mass estimate places it in the regime of being a M dwarf. The motion of the stars are slow enough that their spectral features are always blended, preventing Doppler studies. The PHASES measurements and radial velocities (when available) have been combined with lower precision single-aperture measurements covering a much longer timeframe to improve the characterization of the long period orbits in both binaries. The visual orbits of the short and long period systems are presented for both systems, and used to calculate two possible values of the mutual inclinations between inner and outer orbits of 152 pm 12 degrees or a less likely value of 31 pm 11 degrees for 63 Gem A and 10.2 pm 2.4 degrees or 171.2 pm 2.8 degrees for HR 2896. The first is not coplanar, whereas the second is either nearly coplanar or anti-coplanar.
Gaia Data Release 1: The archive visualisation service
第一个盖亚数据发布（DR 1）提供了超过10亿个天文源的天体测量和测光目录。在用于数据探索的全套方法中，可视化通常是起点，甚至是科学思想的指导参考。然而，这是一个无法使用传统工具、技术和习惯有效探索的数据量。目标：我们的目标是为盖亚档案提供全球视觉探索服务，这对大多数人来说是不可能的。这项服务有两个主要目标。第一个是提供一个软件平台，利用大多数用户可用的普通个人电脑和移动设备，对档案内容进行交互式视觉探索。第二个目标是为档案馆的大量信息内容提供易懂和吸引人的视觉表现。方法：交互式探索服务遵循客户端-服务器设计。服务器靠近数据运行，在存档中，负责尽可能地隐藏客户端的Gaia数据的复杂性和数量。这是通过按需提供视觉细节来实现的。使用数据聚合和二次抽样技术预先计算详细程度。对于DR 1，客户端是一个Web应用程序，提供交互式多面板可视化工作区以及图形用户界面。结果：盖亚存档可视化服务在浏览器选项卡中提供了一个基于Web的多面板交互式可视化桌面。它目前提供Gaia DR 1和Tycho-Gaia天体测量解决方案（TGAS）的高度可配置的1D直方图和2D散点图。一个创新的功能是从图中的视觉定义区域创建ADQL查询。[删节]
Archives of Photographic PLates for Astronomical USE (APPLAUSE) Digitisation of astronomical plates and their integration into the International Virtual Observatory
X-ray Activity of the RS CVn-type Star σ Gem with the First-Year Observations of Einstein Probe
National Astronomical Observatories, Chinese Academy of Sciences（中国科学院国家天文台）；School of Astronomy and Space Science, University of Chinese Academy of Sciences（中国科学院大学天文学院）；INAF - Osservatorio Astronomico di Palermo（意大利国家天体物理研究所巴勒莫天文台）；Department of Physics, Imperial College London（伦敦帝国理工学院物理系）
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）
