Gravity field estimation of Callisto using tracking data for the upcoming Tianwen-4 mission
文献类型：期刊论文
| 作者 | Sun, Shangbiao2; Yan, Jianguo1,2; Gao, Wutong2; Wang, Chongyang2; Afzal, Zohaib2; Wang, Zhen1; Barriot, Jean-Pierre2 |
| 刊名 | ACTA ASTRONAUTICA
 |
| 出版日期 | 2026-04-01 |
| 卷号 | 241页码:181-191 |
| 关键词 | Callisto Gravity Tides Orbit determination |
| ISSN号 | 0094-5765 |
| DOI | 10.1016/j.actaastro.2025.12.061 |
| 产权排序 | 2 |
| 英文摘要 | Callisto's internal structure remains poorly constrained due to the limited resolution of existing gravity field models derived from Galileo flybys. Unlike ESA's JUICE and NASA's Europa Clipper missions, China's upcoming Tianwen-4 mission will orbit Callisto, providing a unique opportunity to determine its high-degree gravity field and tidal Love number. Using in-house precision orbit determination software and simulated radio tracking data, this study investigates the capability of the China Deep Space Network (CDSN) to estimate Callisto's gravity field under various observation geometries and tracking configurations. The results show that reducing Doppler noise from 0.1 to 0.01 mm/s improves precision by an order of magnitude. At altitudes of 200 km and 400 km, coefficients can be resolved up to degrees 80 and 50, respectively. Increasing orbital eccentricity from 0 to 0.1 degrades estimation accuracy. Combining range and VLBI observables improves the accuracy of low-degree gravity coefficients by about 1.4 and 1.5 times, respectively. Combining all CDSN stations further improves the estimation accuracy across all degrees. Extending tracking duration from 6 to 12 months improves estimated accuracy and spatial resolution. The best and worst gravity field estimations provide a quantitative basis for comparing orbital prediction accuracy and Callisto's gravity anomaly uncertainties. The lowest accuracy in the k2 estimation occurs at an orbital altitude of 400 km, with a 1-sigma uncertainty of 0.033, which remains sufficient to detect the potential presence of a subsurface ocean. These results demonstrate the strong potential of CDSN-supported Tianwen-4 mission to achieve high-precision gravity estimation and internal structure characterization of Callisto. |
| WOS关键词 | ORBIT DETERMINATION ; INTERIOR STRUCTURE ; MARS ; EUROPA ; SHAPE ; ICE |
| 资助项目 | DAR grant in planetology from the French Space Agency (CNES)[-2021-2023] |
| WOS研究方向 | Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:001662317900002 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| 资助机构 | DAR grant in planetology from the French Space Agency (CNES) |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/8502]  |
| 专题 | 射电天文研究室_行星科学研究组 |
| 通讯作者 | Yan, Jianguo |
| 作者单位 | 1.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Peoples R China 2.Wuhan Univ, State Key Lab Informat Engn Surveying, Mapping & Remote Sensing, Wuhan 430079, Hubei, Peoples R China |
| 推荐引用方式 GB/T 7714 | Sun, Shangbiao,Yan, Jianguo,Gao, Wutong,et al. Gravity field estimation of Callisto using tracking data for the upcoming Tianwen-4 mission[J]. ACTA ASTRONAUTICA,2026,241:181-191. |
| APA | Sun, Shangbiao.,Yan, Jianguo.,Gao, Wutong.,Wang, Chongyang.,Afzal, Zohaib.,...&Barriot, Jean-Pierre.(2026).Gravity field estimation of Callisto using tracking data for the upcoming Tianwen-4 mission.ACTA ASTRONAUTICA,241,181-191. |
| MLA | Sun, Shangbiao,et al."Gravity field estimation of Callisto using tracking data for the upcoming Tianwen-4 mission".ACTA ASTRONAUTICA 241(2026):181-191. |
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来源：新疆天文台
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