Difference between revisions of "October 20, 2012"
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=No Longer Straight= | =No Longer Straight= | ||
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| − | <em>image by [http://wms.selene.jaxa.jp/selene_viewer/jpn/observation_mission/tc/tc_043.html JAXA-Kaguya Image Gallery] with inset from [http:// | + | <em>image by [http://wms.selene.jaxa.jp/selene_viewer/jpn/observation_mission/tc/tc_043.html JAXA-Kaguya Image Gallery] with inset from [[April_13,_2005|Zac Pujic]]</em><br /> |
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| + | One of the most common subjects for futurist drawings of the Moon before the space age was the Straight Wall - and here we finally see an image with a similar | ||
| + | perspective. And what a view it is, with the Wall, not quite so straight, stretching nearly to the horizon, with the bright-rimmed crater Birt (B on inset) seen nearly | ||
| + | in profile at upper right. I must admit some disappointment - I had pictured the Wall having more of a clean slope with a sharp edge at the top. But it is like 3.5 | ||
| + | billion year old crater rims, worn to a roundness by uncountable small impacts and seismic shakes. The nearest section of the Wall seems less steep than more | ||
| + | distant parts, where according to work of [http://digidownload.libero.it/glrgroup/selenologytoday10.pdf GLR] (pdf. p 41), the maximum height is almost 500 m and the slope reaches 21°. The nick at point 2 in the inset appears | ||
| + | on the Kaguya image to be an old crater; from Earth-based images it appeared more like a sloping ridge along the front of the Wall. This view also suggests a relatively | ||
| + | straight tonal boundary that parallels the scarp to the right of it - I don't know if it is real nor what it might be. Finally, the mountains at the upper left horizon make up | ||
| + | the cross guard of the sword handle in the [http://www.skyandtelescope.com/observing/objects/moon/3304161.html sword] that Huygen's compared the Straight Wall to. | ||
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<em>[mailto:tychocrater@yahoo.com Chuck Wood]</em><br /> | <em>[mailto:tychocrater@yahoo.com Chuck Wood]</em><br /> | ||
| − | This is a classic LPOD form [http://lpod. | + | This is a classic LPOD form [http://www2.lpod.org/wiki/November_13,_2009 Nov 13, 2009]<br /> |
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<strong>Technical Details</strong><br /> | <strong>Technical Details</strong><br /> | ||
| − | I assume this view was achieved by using stereo images from Kaguya's Terrain Camera to construct a digital terrain map. The map, with the image draped over it, | + | I assume this view was achieved by using stereo images from Kaguya's Terrain Camera to construct a digital terrain map. The map, with the image draped over it, |
was then viewed from the north looking southward down the fault.<br /> | was then viewed from the north looking southward down the fault.<br /> | ||
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<strong>Related Links</strong><br /> | <strong>Related Links</strong><br /> | ||
| − | Rükl plate [ | + | Rükl plate [https://the-moon.us/wiki/R%C3%BCkl_54 54]<br /> |
| − | A higher angle, but still oblique [ | + | A higher angle, but still oblique [[July_30,_2004|view]].<br /> |
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| + | <p><b>Yesterday's LPOD:</b> [[October 19, 2012|Tinted]] </p> | ||
| + | <p><b>Tomorrow's LPOD:</b> [[October 21, 2012|Going Extreme]] </p> | ||
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Latest revision as of 07:35, 28 October 2018
No Longer Straight
image by JAXA-Kaguya Image Gallery with inset from Zac Pujic
One of the most common subjects for futurist drawings of the Moon before the space age was the Straight Wall - and here we finally see an image with a similar
perspective. And what a view it is, with the Wall, not quite so straight, stretching nearly to the horizon, with the bright-rimmed crater Birt (B on inset) seen nearly
in profile at upper right. I must admit some disappointment - I had pictured the Wall having more of a clean slope with a sharp edge at the top. But it is like 3.5
billion year old crater rims, worn to a roundness by uncountable small impacts and seismic shakes. The nearest section of the Wall seems less steep than more
distant parts, where according to work of GLR (pdf. p 41), the maximum height is almost 500 m and the slope reaches 21°. The nick at point 2 in the inset appears
on the Kaguya image to be an old crater; from Earth-based images it appeared more like a sloping ridge along the front of the Wall. This view also suggests a relatively
straight tonal boundary that parallels the scarp to the right of it - I don't know if it is real nor what it might be. Finally, the mountains at the upper left horizon make up
the cross guard of the sword handle in the sword that Huygen's compared the Straight Wall to.
Chuck Wood
This is a classic LPOD form Nov 13, 2009
Technical Details
I assume this view was achieved by using stereo images from Kaguya's Terrain Camera to construct a digital terrain map. The map, with the image draped over it,
was then viewed from the north looking southward down the fault.
Related Links
Rükl plate 54
A higher angle, but still oblique view.
Yesterday's LPOD: Tinted
Tomorrow's LPOD: Going Extreme
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