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Apollo Sites from LRO
Paolo
post Apr 19 2017, 04:02 PM
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QUOTE (GoneToPlaid @ Apr 19 2017, 04:23 PM) *
How big is the retro rocket?


my sources say a sphere 94 cm (3 ft) across
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mcaplinger
post Apr 19 2017, 04:06 PM
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QUOTE (GoneToPlaid @ Apr 19 2017, 07:23 AM) *
How big is the retro rocket?

I'm pretty sure Surveyor used an early version of the Star-37 -- http://www.astronautix.com/s/star37.html -- so 0.66 meters in diameter.


--------------------
Disclaimer: This post is based on public information only. Any opinions are my own.
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GoneToPlaid
post Apr 19 2017, 04:09 PM
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QUOTE (Phil Stooke @ Apr 5 2017, 06:18 AM) *
This is my interpretation of the field of view of the Apollo image AS12-46-6759. First a rough perspective view of the image to help identify features near the horizon.

[attachment=41144:AS12_46_...rsp_post.jpg]

And a broader LROC view of the area:


[attachment=41146:AS12_46_...iew_post.jpg]

The prominent crater with a little crater on its near rim (A) is not the larger one near the retro-rocket impact - B. If B is visible at all it is the one barely visible near the right edge and horizon. I don't thing the retro-rocket casing would be visible at all, given the poor focus and the distance. In particular it's not the nice round object just beyond A.

Phil


A in your reprojected view of AS12-46-6749 really is B as labeled in your LRO overhead view. The terrain towards the Surveyor III retro rocket impact site actually is somewhat up-slope from the landing site -- just a bit more than enough up-slope to counter the local curvature of the lunar surface when looking towards the retro rocket impact site from near the lunar module. Although you postulated that the retro rocket might be resting on the lip of its created crater, to me and in my deconvolved images the retro rocket appears to be resting at the center of the crater. The nozzle is perhaps casting a very fine yet distinct shadow within the crater. The lip on the crater appears to be just that -- a crater lip and not the retro rocket itself.

AS12-46-6738 also appears to show the Surveyor III retro rocket impact site. I will post enhanced photos of this particular image.
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Phil Stooke
post Apr 19 2017, 06:34 PM
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It's very difficult to match points between surface and overhead views, and I have certainly made many mistakes in the past. That's why I like to stretch out the image in a reprojection. But in this case I think my matching features were correct.

Here is a direct comparison between the roughly projected view and a greatly enlarged LROC NAC image (M162466771L). Over 20 points of correspondence can be mapped. Number 15 is my previous crater A. Out at the edge, beyond my points 14 and 21, the surface drops into a shallow crater, and my previous crater B is seen where its far rim rises up again, twice as far away, but still short of the retro-rocket.

Phil


Attached Image


--------------------
... because the Solar System ain't gonna map itself.
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GoneToPlaid
post Apr 19 2017, 09:14 PM
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QUOTE (Phil Stooke @ Apr 19 2017, 11:34 AM) *
It's very difficult to match points between surface and overhead views, and I have certainly made many mistakes in the past. That's why I like to stretch out the image in a reprojection. But in this case I think my matching features were correct.

Here is a direct comparison between the roughly projected view and a greatly enlarged LROC NAC image (M162466771L). Over 20 points of correspondence can be mapped. Number 15 is my previous crater A. Out at the edge, beyond my points 14 and 21, the surface drops into a shallow crater, and my previous crater B is seen where its far rim rises up again, twice as far away, but still short of the retro-rocket.

Phil


Attached Image


That matching is spot on!
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