JWST/NIRSpec微快门阵列的在轨退化：多路复用与目标捕获
On-orbit Degradation of the JWST/NIRSpec Micro-Shutter Array: Multiplexing and Target Acquisition
AI总结：
本文统计分析JWST/NIRSpec微快门在轨退化影响，量化其对多路复用观测和自主MSATA目标捕获能力的下降，并给出参考星不足风险的增长数据。
摘要：
本文对自调试以来JWST/NIRSpec微快门阵列所经历的可用快门数量减少的影响进行了统计分析。结果表明，迄今为止，NIRSpec能够同时观测的高优先级科学目标数量已下降3.1%。然而，更令人担忧的是，NIRSpec执行自主MSATA目标捕获的能力有所减弱，与多路复用相比，该能力对快门损失更为敏感。在MSA深场观测这一首要案例中，无法达到所需最少5颗有效参考星的指向比例已从4.9%增至6.3%，并开始变得明显。类似地，需要以少于所允许的最大8颗参考星数量来执行的较高风险目标捕获，其比例已从27%增至31%。
英文摘要：
A statistical analysis of the impact of the diminishing number of operational shutters experienced by the JWST/NIRSpec Micro Shutter Array since Commissioning is presented. It is shown that the number of high priority science targets that NIRSpec is able to observe simultaneously has so far decreased by 3.1%. Of greater concern, however, is NIRSpec's diminished ability to carry out autonomous MSATA target acquisition, which is more sensitive to the loss of shutters than is the multiplexing. In the flagship case of MSA observations of deep fields, the number of pointings at which it is not possible to reach the required minimum number of 5 Valid Reference Stars has increased from 4.9% to 6.3% and is beginning to become noticeable. Similarly, the number of higher risk target acquisitions that need to be carried out with fewer than the maximum allowed number of 8 Reference Stars has grown from 27% to 31%.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
