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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 5.

Preperihelion heliocentric light curve of 3I/ATLAS. The measurements from this work (red squares, ρ = 5000 km) are compared with space-based measurements from Q. Zhang & K. Battams (2026, blue triangles, ρ > 1 × 104 km), ground-based measurements from D. Jewitt & J. Luu (2025, yellow circles, ρ = 1 × 104 km), and CCD data from the COBS database (gray dots). Dashed lines indicate the brightening trends, which follow an ﹩{r}_{h}^{-3.8}﹩ power law at larger distances before transitioning to a steeper ﹩{r}_{h}^{-7.5}﹩ slope near rh ∼ 2.5 au.

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