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Chimera is a NASA mission concept to orbit and explore 29P/Schwassmann-Wachmann 1 (SW1), an active, outbursting small icy body in the outer solar system. The concept was developed in response to the 2019 NASA call for potential missions in the Discovery-class, and it would have been the first spacecraft encounter with a Centaur and the first orbital exploration of a small body in the outer solar system. The Chimera proposal was ranked in the first tier (Category 1) of submissions, but was not selected for further development for the programmatic reason of maintaining scientific balance.

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  • Chimera (spacecraft) (en)
  • 客迈拉号 (zh)
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  • 客迈拉号（Chimera）是美国宇航局一项环绕和探索外太阳系中活跃、喷发的小冰体—29P/施瓦斯曼-瓦赫曼彗星的概念任务。这一概念是应2019年美国宇航局发现计划任务倡议而开发，将是首次航天器与半人马小行星的交会，也是第一次对外太阳系小天体的轨道探测。“客迈拉号”提案被列为第一级（第1类）建议，但为保持科学平衡的原则性要求，该提案未被选择作进一步的开发。 施瓦斯曼-瓦赫曼1号是半人马小行星群之一，这群近乎原始的天体因受引力扰动，会从柯伊伯带进入木星与海王星之间不稳定的轨道。许多半人马小行星最终迁移至内太阳系成为木星系彗星（JFCs），而施瓦斯曼-瓦赫曼1号彗星则被认为占据了小行星在进行这种转变时，所需穿过的轨道“关口”。从太阳系边缘时的冰质小天体，到经过太阳附近时的活跃彗星，施瓦斯曼-瓦赫曼1号彗星是一颗带有不同进化阶段特征的“客迈拉”综合体。这也提供了一次独特的机会来研究这些天体如何随时间的变化而形成、组合和改变的。在历时2年多的轨道交会中，“客迈拉号”将对施瓦斯曼-瓦赫曼1号彗星逸出的气体彗发进行取样，研究其活动和喷发模式，测绘表面结构和地形、探测其内部，并监测它演变过程中的变化。 (zh)
  • Chimera is a NASA mission concept to orbit and explore 29P/Schwassmann-Wachmann 1 (SW1), an active, outbursting small icy body in the outer solar system. The concept was developed in response to the 2019 NASA call for potential missions in the Discovery-class, and it would have been the first spacecraft encounter with a Centaur and the first orbital exploration of a small body in the outer solar system. The Chimera proposal was ranked in the first tier (Category 1) of submissions, but was not selected for further development for the programmatic reason of maintaining scientific balance. (en)
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  • Chimera (en)
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  • Chimera (en)
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  • http://commons.wikimedia.org/wiki/Special:FilePath/67P_Churyumov-Gerasimenko_-_Rosetta_(32755885495).png
  • http://commons.wikimedia.org/wiki/Special:FilePath/Chimera_Discovery_Mission_Concept.png
  • http://commons.wikimedia.org/wiki/Special:FilePath/TNO_JFC_comparison_image.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/29P-orbit.png
  • http://commons.wikimedia.org/wiki/Special:FilePath/29P_Schwassmann_Wachmann.jpg
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  • all (en)
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  • A Gateway to the Centaurs and the Secrets of Small Body Formation (en)
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  • Visible and Thermal Imagers, Mass & Infrared Spectrometers, Radar (en)
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  • Chimera is a NASA mission concept to orbit and explore 29P/Schwassmann-Wachmann 1 (SW1), an active, outbursting small icy body in the outer solar system. The concept was developed in response to the 2019 NASA call for potential missions in the Discovery-class, and it would have been the first spacecraft encounter with a Centaur and the first orbital exploration of a small body in the outer solar system. The Chimera proposal was ranked in the first tier (Category 1) of submissions, but was not selected for further development for the programmatic reason of maintaining scientific balance. SW1 is a member of the Centaur group, a population of near-pristine objects that have been gravitationally perturbed from the Kuiper Belt into unstable orbits in the region between Jupiter and Neptune. Many Centaurs eventually migrate into the inner Solar System to become short period, 'Jupiter Family' comets (JFCs), and SW1 is believed to occupy the orbital ‘gateway’ through which they pass as they make this transition. SW1’s characteristics are a chimeric combination of icy small bodies at different points along their evolution from the fringes of the solar system to active comets passing near the Sun. This provides a unique opportunity to study how these objects formed, are composed, and change over time. Over a more than 2 year orbital encounter, Chimera would sample the escaping gas coma of SW1, study its patterns of activity and outburst, map the composition and topography of its surface, probe its interior, and monitor for changes as it evolves. (en)
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