Difference between revisions of "June 25, 2010"
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<em>image by Hold Siegfried, Schulberg, Austria</em><br /> | <em>image by Hold Siegfried, Schulberg, Austria</em><br /> | ||
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| − | According to the IAU the length of the Sharp Rille is 107 km, but actually its more than twice that, and most of its length is visible on Hold's dramatic image. Jim Mosher's [http://the-moon.wikispaces.com/Rima+Sharp measurements] on a Lunar Orbiter image show that the rille width is mostly about 1100 m and its depth decreases from 300 m to 200 m from north to south. From the full-resolution Kaguya topo [http://lpod.wikispaces.com/April+10%2C+2008 map] it appears that the northern end of the rille is one contour interval (1 km) higher than all the rest of the rille, implying that for most of its 250 km length the elevation change was less than 1 km. To the west an unnamed mare ridge parallels the rille, and the surface beyond the ridge is crossed by numerous wormy-looking smaller ridges. Harry Hiesinger's mare age [mailto:tychocrater@yahoo.com Chuck Wood]<br /> | + | According to the IAU the length of the Sharp Rille is 107 km, but actually its more than twice that, and most of its length is visible on Hold's dramatic image. Jim Mosher's [http://the-moon.wikispaces.com/Rima+Sharp measurements] on a Lunar Orbiter image show that the rille width is mostly about 1100 m and its depth decreases from 300 m to 200 m from north to south. From the full-resolution Kaguya topo [http://lpod.wikispaces.com/April+10%2C+2008 map] it appears that the northern end of the rille is one contour interval (1 km) higher than all the rest of the rille, implying that for most of its 250 km length the elevation change was less than 1 km. To the west an unnamed mare ridge parallels the rille, and the surface beyond the ridge is crossed by numerous wormy-looking smaller ridges. Harry Hiesinger's mare age [http://www.lpod.org/?m=20070407 map] shows the lavas containing the rille to be very young (~1.3 b.y) whereas the ones beyond the mare ridge are 2 billion years older (3.4 b.y.)! <br /> |
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| + | <em>[mailto:tychocrater@yahoo.com Chuck Wood]<br /> | ||
(I am traveling Wed and Thursday, so this is a classic LPOD from [http://lpod.wikispaces.com/October+29%2C+2008 Oct 29, 2008]).</em><br /> | (I am traveling Wed and Thursday, so this is a classic LPOD from [http://lpod.wikispaces.com/October+29%2C+2008 Oct 29, 2008]).</em><br /> | ||
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Revision as of 19:59, 1 January 2015
A Sharper Image
image by Hold Siegfried, Schulberg, Austria
According to the IAU the length of the Sharp Rille is 107 km, but actually its more than twice that, and most of its length is visible on Hold's dramatic image. Jim Mosher's measurements on a Lunar Orbiter image show that the rille width is mostly about 1100 m and its depth decreases from 300 m to 200 m from north to south. From the full-resolution Kaguya topo map it appears that the northern end of the rille is one contour interval (1 km) higher than all the rest of the rille, implying that for most of its 250 km length the elevation change was less than 1 km. To the west an unnamed mare ridge parallels the rille, and the surface beyond the ridge is crossed by numerous wormy-looking smaller ridges. Harry Hiesinger's mare age map shows the lavas containing the rille to be very young (~1.3 b.y) whereas the ones beyond the mare ridge are 2 billion years older (3.4 b.y.)!
Chuck Wood
(I am traveling Wed and Thursday, so this is a classic LPOD from Oct 29, 2008).
Technical Details
See image
Related Links
Rükl plate 9
Hold's photostream
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