Fig. 2


Excerpt from MIRO GNM observation on 2014-10-23 (two consecutive scans). Top: series of images show Rosetta views of the nucleus shape of 67P at various times within the scans, obtained from the Rosetta 3D tool (ESA/Rosetta/SGS – CC BY-SA IGO 3.0). The exposure is deliberately enhanced to make shadowed region visible in the images. The MIRO beam footprints are shown as two green circles, large (MM) and small (SMM). Back-and-forth scans were made at a rate of 2 deg/min, and 1 min was allocated between scan lines for steps in the orthogonal direction. The orientation and direction of the scanning pattern is depicted with white dashed arrows in every image. Bottom: antenna temperatures (TA) recorded as a function of time over the scanning pattern. SMM and MM TA are shown in blue and red, respectively. A calibration interruption of the data is indicated by the gray shaded area denoted CAL. The exact times of Rosetta views at the top of figure are indicated as dashed vertical lines. 0 K-level sky data are obtained at the beginning of the first scan and at the end of the second. All other measurements are fully resolved, on-nucleus, and mostly cover regions that are not illuminated.

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