• Seasonal forecasts for 67P/C-G
    http://blogs.esa.int/rosetta/2015/02/09/seasonal-forecasts-for-67pc-g

    Based on the press release of the Max Planck Institute for Solar System Research, Germany. Scientists from #Rosetta’s OSIRIS team have been analysing the images of #Comet_67P/Churyumov-Gerasimenko and comparing them to a thermal model to estimate how much material the various parts of the #comet will lose through Sun-driven sublimation during one orbit. That is, as the Sun heats the comet, ices sublimate and the resulting gases drag dust into the comet’s coma. The results predict that the southern half of the comet will undergo dramatic changes in the coming months, losing a surface layer several metres thick, while the northern half will likely be much less affected by the Sun-driven erosion. Followers of this blog might be familiar with the geography of Comet 67P/C-G, but it’s worth (...)

    #Science #rosetta #science

    • While the northern “hemi-comet” experiences a long summer that lasts for 5.6 years while it is far away from the Sun, the southern “hemi-comet” has a short, but intense, hot season of about 10 months. The southern “hemi-comet” is currently facing away from the Sun, but this long polar night will end soon, as sunlight will illuminate these regions again in May.
      (…)
      The scientists expect the southern side of the comet to change dramatically as it approaches perihelion in August. The team also notes that the insolation on the “neck” region between the comet’s two lobes is particularly weak; however, this region has displayed the strongest and earliest signs of dust activity in the past months, suggesting it might be characterised by a different composition to the rest of the comet.

      Quite possibly, 67P after perihelion will no longer be the comet we have grown used to in the past months,” says Sierks. “Witnessing these changes from up close will be an unsurpassed adventure.