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<p>China’s ongoing Tianwen-2 mission will return samples from a small, rapidly spinning Earth quasi-satellite (469219) Kamoʻoalewa. Previous studies linked Kamoʻoalewa to lunar composition and origin. Here, we propose another scenario. We reanalyze the reflectance spectrum of Kamoʻoalewa and obtain an absorption band center at 1.001 ± 0.028 μm (error is 1σ), consistent with LL chondrites. We then conduct space weathering experiments on meteorites and find that highly space-weathered LL chondrite powder (but not slab) successfully reproduces the reflectance spectrum of Kamoʻoalewa. We further trace the dynamical origin of Kamoʻoalewa and find that it probably originated from the ν<sub>6</sub> secular resonance, and more specifically, the Flora family. Kamoʻoalewa exhibits a similar composition to Itokawa and 7 objects in the Flora family, but with a higher degree of space weathering. We, therefore, propose that Kamoʻoalewa probably originated from the Flora family and developed an Itokawa-compositional, more space-weathered, fine-regolith-dominated surface.</p>

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Tianwen-2 mission target asteroid (469219) Kamoʻoalewa probably develops an Itokawa-compositional but more space-weathered surface

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月27日

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  • Pengfei Zhang,
  • Guozheng Zhang,
  • Zichen Wei,
  • Mikael Granvik,
  • Xiaoran Yan,
  • Pengyue Wang,
  • Qinwei Zhang,
  • Ronghua Pang,
  • Wen-Han Zhou,
  • Te Jiang,
  • Pierre Vernazza,
  • Takahiro Hiroi,
  • Edward Cloutis,
  • Francesca DeMeo,
  • Pierre Beck,
  • Wing-Huen Ip,
  • Marco Fenucci,
  • Yongxiong Zhang,
  • Michael Marsset,
  • Yunbo Niu,
  • Xuejin Lu,
  • Xing Wu,
  • Honglei Lin,
  • Shoucun Hu,
  • Bin Cheng,
  • Haibin Zhao,
  • Xiaobin Wang,
  • Xiaoping Lu,
  • Yonglong Zhang,
  • Zongcheng Ling,
  • Jiang Zhang,
  • Sizhe Zhao,
  • Cateline Lantz,
  • Jooyeon Geem,
  • Zhiping He,
  • Juntao Wang,
  • Liyong Zhou,
  • Xiliang Zhang,
  • Shijei Li,
  • Sen Hu,
  • Wei Yang,
  • Xiongyao Li,
  • Xiaoping Zhang,
  • Jiahui Liu,
  • Peng Zhang,
  • Guang Zhang,
  • Yangting Lin,
  • Yang Li

摘要

China’s ongoing Tianwen-2 mission will return samples from a small, rapidly spinning Earth quasi-satellite (469219) Kamoʻoalewa. Previous studies linked Kamoʻoalewa to lunar composition and origin. Here, we propose another scenario. We reanalyze the reflectance spectrum of Kamoʻoalewa and obtain an absorption band center at 1.001 ± 0.028 μm (error is 1σ), consistent with LL chondrites. We then conduct space weathering experiments on meteorites and find that highly space-weathered LL chondrite powder (but not slab) successfully reproduces the reflectance spectrum of Kamoʻoalewa. We further trace the dynamical origin of Kamoʻoalewa and find that it probably originated from the ν6 secular resonance, and more specifically, the Flora family. Kamoʻoalewa exhibits a similar composition to Itokawa and 7 objects in the Flora family, but with a higher degree of space weathering. We, therefore, propose that Kamoʻoalewa probably originated from the Flora family and developed an Itokawa-compositional, more space-weathered, fine-regolith-dominated surface.