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Interstellar Object 3I/ATLAS Observed from Mars by China’s Tianwen-1 Spacecraft

  • Authors: Xin Ren, 鑫 任, Wei Yan, 韦 严, Ruining Zhao, 瑞宁 赵, Shu Wang, 舒 王, Xingye Gao, 兴烨 高, Qiang Fu, 强 付, Qing Zhang, 庆 张, Bin Yang, 彬 杨, Man-To Hui, 文韜 許, Zhiyong Xiao, 智勇 肖, Xiaodong Liu, 晓东 刘, Cunhui Li, 存惠 李, Renhao Tian, 仁浩 田, Wenguang Liu, 文光 刘, Dong Wang, 栋 王, Shaoran Liu, 少然 刘, Cong Ren, 聪 任, Jie Dong, 捷 董, Xinbo Zhu, 新波 朱, Pan Xie, 攀 谢, Jian-Yang Li, 荐扬 李, Yan Geng, 言 耿, Jianjun Liu, 建军 刘

Xin Ren et al 2026 The Astrophysical Journal Letters 1003 .

  • Provider: AAS Journals

Caption: Figure 1.

The sky coordinate of 3I from Earth between 2025 July 1 and early 2026 January (blue line) and from Mars during the three epochs of Tianwen-1 observations (filled orange squares). The thin dashed curve marks the ecliptic plane. The vertical dotted line marks the R.A. of 3I from Earth at perihelion, and the shaded area marks the range of R.A. with solar elongation <45°. While no ground-based optical observations are possible near perihelion and solar conjunction, monitoring can still be continued with space-based facilities.

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