Comet 67/P, imaged by Rosettas / OSIRIS on 7 August. Photo credits: ESA / Rosetta / MPS for OSIRIS Team MPS / UPD / LAM / IAA / SSO / INTA / UPM / DASP / IDA. At the suggestion of Taras, I have developed a 3D mapping more targeted, taking into account the possibility of a spike in reflected light, caused by the presence of ice in some areas of the comet. I checked and then re-calibrated the thermal data of the surface temperatures, considering the temperature range obtained by the VIRTIS instrument (measured between -70 C / 200 K and -50 C / 220 K). I then set the thermal mapping within a modular grid, of 400 x 400 m, and I have re-calibrated the pixels / brightness in the ImageJ function. The result is of an thermal mapping, with a peak between 160 K and 240 K, less extensive than the previous analysis. In the neck area there is a zone delimited with a high thermal value of 240 K; in the vicinity of this area you can read a value between 220 K and 200 K. While the jagged areas that are visible along the walls of the neck, measure between 80 K and 40 K, and then they are very cold.
Posted on: Sun, 17 Aug 2014 10:00:18 +0000
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