中国天问一号火星轨道器于2026年7月用高分辨率相机成功拍摄到星际彗星3I/ATLAS1。这次观测距离约3000万公里1，拍摄到的图像显示了彗星的尾部和昏迷1，证实该彗星含有水等易挥发物质1。
天问一号已在火星轨道运行四年八个月1，此次观测成为其在轨期间的重要科学成果。3I/ATLAS彗星直径约5.6公里1，以约58公里每秒的速度运行1，相对天问一号的速度约为86公里每秒1。该彗星于2025年5月7日被发现1。欧洲火星轨道器——火星快车号和火星微量气体轨道器——也在10月3日拍摄了这颗彗星1。
China's Tianwen-1 Mars orbiter successfully photographed the interstellar comet 3I/ATLAS in July 2026 using its high-resolution camera, capturing detailed images of the comet's tail and coma at a distance of approximately 30 million kilometers 1. The observations provided evidence that the comet contains volatile substances including water 1. This achievement marks a significant scientific milestone for Tianwen-1, which has been operating in Mars orbit for four years and eight months 1.
The comet, discovered on May 7, 2025, measures approximately 5.6 kilometers in diameter and travels at roughly 58 kilometers per second, reaching a relative velocity of about 86 kilometers per second with respect to Tianwen-1 1. Tianwen-1 was not alone in documenting this celestial visitor; European Mars orbiters, including Mars Express and the Trace Gas Orbiter, also captured images of 3I/ATLAS on October 3 1. The European Space Agency's Comet Interceptor mission is expected to complete its observations by 2029 1.
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