The third iteration of the International Celestial Reference Frame (ICRF3) is made up of 4536 quasars observed at S/X bands using very-long-baseline interferometry. These sources are high-redshift quasars, typically between 1 < z < 2, that are believed to host active galactic nuclei at their centers. The position of compact radio sources can be determined better than sources with large amounts of extended radio structure. Here we report information on a series of 20 observations from 2017 January through December 2017 that were designed for precise astrometry and to monitor the structure of sources included in the ICRF3. We targeted 3627 sources over the one year campaign and found the median flux density of 2697 detected sources at S band is 0.13 Jy, and the median flux density of 3209 sources detected at X band is 0.09 Jy. We find that 70% of detected sources in our campaign are considered compact at X band and ideal for use in the ICRF and 89% of the 2615 sources detected at both frequencies have a flat spectral index, α > 0.5

国际天体参考系 (ICRF3) 的第三次迭代由使用超长基线干涉测量法在S/X波段观测到的 4536 个类星体组成。这些来源是高红移类星体，通常在 1 < z < 2 之间，据信它们在其中心拥有活跃的星系核。与具有大量扩展无线电结构的源相比，可以更好地确定紧凑型无线电源的位置。在这里，我们报告了 2017 年 1 月至 2017 年 12 月的一系列 20 次观测的信息，这些观测旨在用于精确天体测量并监测 ICRF3 中包含的源结构。我们在一年的活动中针对 3627 个源，发现了S的 2697 个检测源的中值通量密度波段为 0.13 Jy，在X波段检测到的 3209 个源的中值通量密度为 0.09 Jy。我们发现，在我们的活动中，70% 的检测到的源在X波段被认为是紧凑的，非常适合在 ICRF 中使用，并且在两个频率上检测到的 2615 个源中有 89% 具有平坦的光谱指数，α > 0.5