67P/Churyumov-Gerasimenko. A single body that has been stretched- Part 3

(Please scroll down for parts 1 and 2)

This post carries on from Part 2, that is, from the fuchsia dot in the recess on the head and its counterpart on a distinctive peak on the body. I’ve marked them yellow this time because they also act as end points. The matching head and body shear line will now be extended round as far as the shadowed side in one direction and to the crater rim of site A in the other direction.

If you have followed parts one and two you will be familiar with the coloured dotting technique but in these photos there are no sequential colours marking long wavy lines. It’s somewhat simpler. Generally speaking, it’s yellow dots for specific points or end points of lines (except for the last photo where they delineate a crater edge). Light blue for ridges that match. There are some dark green dots in two photos, roughly showing matching points or lines that were dealt with in Part 1, but this time from a different viewpoint. That’s more for orientation. And some terracotta thrown in specifically for two points, side by side, which don’t have their respective twins in the same photo- they match across photos.

In photo 1, the end point of the line in part 2 is marked with yellow dots in the head recess and the peak below. The peak doesn’t look very pointy because we are looking up from below the body. Notice two small dimples on it which are almost obscured by a blue dot. Those crop up in a clearer view of that peak in photo 2 and show that it is indeed the correct peak.

The left hand yellow dots are the end points situated at the near-90 -degree turn towards the terminator shadow. The top section fits to the bottom section at this corner. If you measure the distance between the dots (or the points they are marking) you’ll find top and bottom are identical in length. Also, the wavy line along the bottom matches fairly well the ups and downs of the top line despite being seen from a low vantage point.

The blue dots show a ridge that was contiguous from head to body. The terracotta dots match their counterparts in photo 4

Photo 1

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Photo 2

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In photo 2, the yellow dots serve the same purpose as in photo 1.
However it’s a bit whited out on the head so I left out the top left corner dot because I couldn’t really place it. The same goes for the curve up to the yellow dot in the recess. It’s whited out so I marked the curve you can discern in green (the Part 2 head perimeter) and the eye can then extend the curve to the recess. The centre green dot is on the ‘frill’ mentioned in part 1, which is now well lit. It’s counterpart is roughly placed at the seating point against the low, bulbous ridge below on the body. The blue dots denote the ridge again. This is less obvious in the high illumination but you can see small holes running down both sections. The wayward blue dot is a rogue addition but it happens to mark the terracotta point from a good perspective.

Photo 3

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Photo 3 shows the shear line emerging from under the head, along to the corner. Everything to the outside of it slopes steeply. After the turn, there is a small dogleg after which it extends to the shadow where it appears to turn further clockwise. The head line isn’t marked because most of it is probably just out of sight. It doesn’t look as straight as in photo 1 which clearly looks to be a crisper line that would fit the straight edge below it. I didn’t mark it after the corner in photo 1 either because it was truncated and I couldn’t tell if it was due to shadow or the dog leg. Anyway, toggling from photos 1 to 3 show obvious fit lines up to that point. The blue dots again show a ridge, a fat one this time. The two parts are in line as you look down on them, and have similar pock marks top and bottom.

Photo 4

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Photo 4 is fairly self explanatory. It continues in the other direction from where we started in part 1 (green dots). The yellow curve is much less pronounced on the head due to foreshortening. This is in turn due to the head being tilted forward by some 30 degrees. The terracotta dots from photo 1 finally find their twins. The blue dots show a ridge that is much more prominent in the top down photo in part 1. It may appear that the upper part should be the fluted end section seen in part one and should sit down on the base but it is the section that was above it like a flap. Only the long, front edge of the cliff matches the green dots. The rest is hidden below the flap/ridge. The half-moon green dot is a rogue artefact.

Photo credit: ESA Space in Images/ Rosetta Blog.

I’ll reproduce all photos in this post below, but without annotation dots. Sometimes it’s easier to see the lines and ridges without them.

There will be a part 4 but due to my hunch that huge slabs were lifted as the head sheared away from the base and one of them was sitting on site A, the matches are fewer and less clean. They might match something but it could be a slab orbiting millions of miles behind 67P/C-G. Still, I believe there are some matches beyond site A.

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