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This four-image NAVCAM montage comprises images taken on 20 October from a distance of 9.4 km from the centre of comet 67P/C-G – about 7.4 km from the surface. In this orientation the smaller lobe of the comet is on the left, with the larger lobe on the right. Four image NAVCAM montage comprising images taken on 20 October 2014. Credits: ESA/Rosetta/NAVCAM Assuming the 7.4 km distance, the image scale is about 63cm/pixel, so each 1024 x 1024 pixel frame is about 645 m across (although if we assume the furthest point away is an additional ~1 km further from the centre, the image scale is about 72 cm/pixel). The four 1024 x 1024 pixel images making up the montage are provided below:           fonte

Today’s lead CometWatch image is a four-image NAVCAM mosaic taken on 24 September from a distance of 28.5 km from the centre of comet 67P/C-G (the four 1024 x 1024 pixel images making up the mosaic are provided at the end of this post). The images are background subtracted to remove some striping and fixed noise patterns. Note that at these closer distances, it is harder to create accurate mosaics due to combined effect of the comet rotation between the first and last images taken in the sequence (about 10 degrees over 20 minutes), and the fact that the spacecraft has moved some 1-2 km in the same time. The mosaicking programme we are using (Microsoft ICE) seems to have done a nice job of stitching the images together, but if you refer to the four separate images you will see some differences in illumination and shadows due to this rotation and motion. Four image mosaic of Comet 67P/C-G using images taken on 24 September. Credits: ESA/Rosetta/NAVCAM (C...

Four-image NAVCAM montage comprising images taken on 7 September from a distance of 51 km from comet 67P/C-G Four image montage of comet 67P/C-G, using images taken on 7 September. The four images are shown separated by black borders and there is some overlap between adjacent frames, so that some features appear in more than one image; the montage has been cropped to remove most of the black space around the comet. Credits: ESA/Rosetta/NAVCAM Regular followers of this blog are familiar with how NAVCAM image sequences are now being taken, but you can read more about it in previous blog posts: CometWatch update , Make a NAVCAM mosaic and CometWatch – 2 September . As before, we invite you to create a mosaic using these four images (posted below as individual JPEGs of the four 1024 x 1024 pixel full-frame ‘corners’). An example, with some adjustment of the intensity and cleaning of the background noise, is shown here: Four image montage of comet 67P/C-G, using images t...