国际天体参照系中的天体测量变异度量。I. 统计分析和最大变异源的选择

Phil Cigan, Valeri V. Makarov, Nathan J. Secrest, David Gordon, Megan C. Johnson and Sebastien Lambert
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摘要

我们利用构成第三个国际天体参考框架(ICRF3)的源的甚长基线干涉测量数据,通过确定每个源的过量天体测量变异性(无法解释的方差)与时间的函数关系,检验了国际天体参考框架3的正式源位置不确定性的质量。我们还利用各种指标对数据中看到的天体测量变异性的多个不同质量方面进行了量化。我们将平均位置偏移、统计离散度量以及通过平滑数据探索出的随时间变化的一致性趋势结合在一起,来描述位置最稳定和最不稳定的 ICRF3 来源。我们发现过量方差和统计变异度量明显依赖于 decl.,这是未建模电离层延迟误差和大多数天体测量和大地测量观测活动中北半球为主的网络几何所预期的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Metrics of Astrometric Variability in the International Celestial Reference Frame. I. Statistical Analysis and Selection of the Most Variable Sources
Using very long baseline interferometry data for the sources that comprise the third International Celestial Reference Frame (ICRF3), we examine the quality of the formal source-position uncertainties of ICRF3 by determining the excess astrometric variability (unexplained variance) for each source as a function of time. We also quantify multiple qualitatively distinct aspects of astrometric variability seen in the data, using a variety of metrics. Average position offsets, statistical dispersion measures, and coherent trends over time as explored by smoothing the data are combined to characterize the most and least positionally stable ICRF3 sources. We find a notable dependence of the excess variance and statistical variability measures on decl., as is expected for unmodeled ionospheric delay errors and the Northern Hemisphere–dominated network geometries of most astrometric and geodetic observing campaigns.
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