# Telescopic Network of Zhulong for Orbit Determination and Prediction of Space Objects
## 5 Conclusions  
Telescope network data on the angular positions of space objects are a crucial type of orbital measurement data. This article provides orbital measurement data from the Zhulong telescopic network, which can be publicly accessed by users worldwide. These data are of great significance for the study of the orbits and other characteristics of space objects. Over three months, we analyzed the angular data of three typical space objects and conducted OD and OP calculations. The angular data accuracy analysis results show that the angular data errors for the selected period of the space objects are less than 3 arcseconds. The precise OD and OP results show that the internal consistency error of the orbit determination is within 3 arcseconds. Secondly, when using the CPF orbits as the reference orbit, the OD and OP errors are generally in the hundreds of meters range. The OD error is closely related to the OD duration and the number of observations passed. If the OD duration remains constant, the more observation passes are used, and the smaller the OD and OP errors become. This result also demonstrates the importance of the Zhulong telescopic network in providing open data for precise OD and OP of space objects.  
**Author Contributions:** Conceptualization, J.C. and X.L.; methodology, J.C.; software, J.C. and L.L.; validation, X.L. and Z.L.; formal analysis, L.L.; investigation, S.J.; resources, L.W.; data curation, J.C.; writing--original draft preparation, X.L.; writing--review and editing, J.C. and M.L.; supervision, J.C.; project administration, L.L.; funding acquisition, M.L., X.L. and J.C. All authors have read and agreed to the published version of the manuscript.  
**Funding:** This research was supported by the National Natural Science Foundation of China (12303081), Shandong Provincial Natural Science Foundation General Project (ZR2023 MD098), Yunnan Fundamental Research Projects (202301 AT070159), the Open fund of State Key Laboratory of Geodesy and Earth's Dynamics (SKLGED2024-3-5), and the Scientific Innovation Project for Young Scientists in Shandong Provincial Universities (2022 KJ224).  
**Data Availability Statement:** The angle data used in the text are available at [[https://spacemapper.cn/](https://spacemapper.cn/)]([https://spacemapper.cn/](https://spacemapper.cn/)) (accessed on 1 June 2024). Note that this website requires a registered account, and data can be accessed after successful registration. Requests for observations of space objects may also be made, and those that are made are likely to be approved. The data obtained by the Zhulong telescopic network in the article, such as image data and angular data, were provided by [PERSON] from Beijing Creatunion Parallel Space Technology Co., Ltd. For more information about these data, please refer to the website.  
We acknowledge and appreciate [[https://ilrs.gsfc.nasa.gov](https://ilrs.gsfc.nasa.gov)]([https://ilrs.gsfc.nasa.gov](https://ilrs.gsfc.nasa.gov)) (accessed on 1 June 2024) for providing the CPF data, which are important accuracy evaluation data in this paper. The authors declare no conflicts of interest.