标题： GR700XD光谱迹线在NIRISS/SOSS观测中访问间的稳定性表征 显示英文标题

标题： Characterization of the visit-to-visit Stability of the GR700XD Spectral Traces for NIRISS/SOSS Observations

摘要： 在本报告中，我们展示了对NIRISS/SOSS观测期间轨迹位置变化的分析结果。 我们利用至今获得的数据，研究了GR700XD孔径轮（PW）位置对光谱阶次1和2的轨迹位置的逐次观测影响。 我们的目标是通过将探测器上的轨迹位置与PW位置角度相关联，以改进波长解决方案。 我们发现，对于两个阶次，PW位置与光谱轨迹旋转之间存在一一对应关系。 这使我们能够找到一个解析模型，该模型能够以大约~0.1像素的亚像素精度预测轨迹位置/形状作为PW位置的函数。 这样的函数可用于预测低信噪比情况下的轨迹位置，并且/或作为模板，在时间序列观测（TSOs）中跟踪轨迹位置随时间的变化。 显示英文摘要

摘要： In this report, we present the results of our analysis of trace position changes during NIRISS/SOSS observations. We examine the visit-to-visit impact of the GR700XD pupil wheel (PW) position alignment on trace positions for spectral orders 1 and 2 using the data obtained to date. Our goal is to improve the wavelength solution by correlating the trace positions on the detector with the PW position angle. We find that there is a one-to-one correspondence between PW position and spectral trace rotation for both orders. This allowed us in turn to find an analytic model that is able to predict a trace position/shape as a function of PW position with sub-pixel accuracy of about ~0.1 pixels. Such a function can be used to predict the trace position in low signal-to-noise ratio cases, and/or as a template to track trace position changes as function of time in Time Series Observations (TSOs).