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A race against the clock: Constraining the timing of cometary bombardment relative to Earth's growth

Nesvorný, David; Avice, Guillaume; Raymond, Sean N. +3 more

Comets are considered a potential source of inner solar system volatiles, but the timing of this delivery relative to that of Earth's accretion is still poorly understood. Measurements of xenon isotopes in comet 67P/Churyumov-Gerasimenko revealed that comets partly contributed to the Earth's atmosphere. However, there is no conclusive evidence of …

A new shape model of the bilobate comet 67P/Churyumov-Gerasimenko

Chen, Min; Huang, Xianfeng; Yan, Jianguo +2 more

In this article, we performed the stereo-photogrammetric processing on over 5200 Rosetta/OSIRIS-NAC images to derive a global high-resolution 3D model of the bilobate comet 67P/Churyumov-Gerasimenko, which is visually richer and more convincing than the existing models (i.e., SPG-SHAP4S, SPC-SHAP5 and SPG-SHAP7). This shape model was used to gener…