We present a comprehensive model of the ground-based polarization observations from comet 67P/Churyumov–Gerasimenko using two different apertures on its apparitions of 1982 and 2016. Our modeling suggests that the dust composition viewed within the two apertures is the same, but that they have different size distributions, with smaller particles more concentrated in the innermost coma. The best fits to the measurements using the smallest aperture are obtained using a dust size distribution similar to the Rosetta findings. Furthermore, the model parameters providing the best fit to polarimetric observations using the large aperture appear remarkably consistent with what was previously inferred in other comets. This represents an attempt to reconcile the Rosetta results with ground-based observations.

我们展示了 67P/Churyumov–Gerasimenko 彗星在 1982 年和 2016 年出现时使用两个不同孔径的地面偏振观测的综合模型。我们的模型表明，在两个孔径内观察到的尘埃成分是相同的，但它们具有不同的尺寸分布，较小的颗粒更集中在最里面的昏迷中。使用类似于 Rosetta 发现的尘埃尺寸分布获得了使用最小孔径进行测量的最佳拟合。此外，使用大孔径为偏振观测提供最佳拟合的模型参数似乎与之前在其他彗星中推断的结果非常一致。这代表了将 Rosetta 结果与地面观测结果相协调的尝试。