CSST的天体测量能力模拟
Simulation of CSSTs astrometric capability
AI总结：
本文通过构建天体测量模型和模拟观测，评估了中国空间站望远镜（CSST）在给定巡天计划下的天体测量能力，发现优化巡天计划可提升精度，为策略优化提供了独立建议。
摘要：
中国空间站望远镜（CSST）将于2024年前后进入低地球轨道，运行10年，其中7年用于巡天观测中高银纬度与中高黄纬度的天区。为最大化CSST的科学产出，优化巡天计划至关重要。我们旨在评估CSST在给定巡天计划下的天体测量能力，并为优化巡天策略提供独立建议。为此，我们首先构建天体测量模型，然后基于给定巡天计划进行模拟观测。通过分析模拟观测数据获得天体测量解，随后通过分析天体测量解的特性来评估CSST的天体测量能力。我们发现，对于g波段18-22等的源，CSST的视差和自行精度优于1 mas(yr^-1)；对于g波段22-26等的源，精度约为1-10 mas(yr^-1)。由于假设较为乐观和简单，实际巡天结果可能更差。我们发现优化巡天计划可提高CSST的天体测量精度。未来，我们将通过持续迭代和优化巡天计划来提升CSST的天体测量能力。
英文摘要：
The China Space Station Telescope (CSST) will enter a low Earth orbit around 2024 and operate for 10 years, with seven of those years devoted to surveying the area of the median-to-high Galactic latitude and median-to-high Ecliptic latitude of the sky. To maximize the scientific output of CSST, it is important to optimize the survey schedule. We aim to evaluate the astrometric capability of CSST for a given survey schedule and to provide independent suggestions for the optimization of the survey strategy. For this purpose, we first construct the astrometric model and then conduct simulated observations based on the given survey schedule. The astrometric solution is obtained by analyzing the simulated observation data. And then we evaluate the astrometric capability of CSST by analyzing the properties of the astrometric solution. We find that the accuracy of parallax and proper motion of CSST is better than 1 mas( yr1) for the sources of 18-22 mag in g band, and about 1-10 mas( yr1) for the sources of 22-26 mag in g band, respectively. The results from real survey could be worse since the assumptions are optimistic and simple. We find that optimizing the survey schedule can improve the astrometric accuracy of CSST. In the future, we will improve the astrometric capability of CSST by continuously iterating and optimizing the survey schedule.
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。
