Difference between revisions of "October 24, 2009"
(Created page with "__NOTOC__ =Das Mystery= <!-- ws:start:WikiTextHeadingRule:0:<h1> --> <!-- ws:start:WikiTextLocalImageRule:6:<img src="/file/view/LPOD-Oct24-09.jpg/97383000/L...") |
|||
| (6 intermediate revisions by the same user not shown) | |||
| Line 1: | Line 1: | ||
__NOTOC__ | __NOTOC__ | ||
=Das Mystery= | =Das Mystery= | ||
| − | + | <!-- Start of content --> | |
| − | + | <!-- ws:start:WikiTextHeadingRule:0:<h1> --> | |
| − | + | <!-- ws:start:WikiTextLocalImageRule:6:<img src="/file/view/LPOD-Oct24-09.jpg/97383000/LPOD-Oct24-09.jpg" alt="" title="" /> -->[[File:LPOD-Oct24-09.jpg|LPOD-Oct24-09.jpg]]<!-- ws:end:WikiTextLocalImageRule:6 --><br /> | |
| − | <em>Lunar Orbiter (left) and Clementine (right) images from [mailto:tychocrater@yahoo.com Chuck Wood]</em><br /> | + | <em>Lunar Orbiter (left) and Clementine (right) images from [http://www.mapaplanet.org/explorer-bin/explorer.cgi?map=Moon&layers=moon_lo&west=218.56&south=-30.78&east=223.35&north=-26.93&center_lat=&center=220.955&defaultcenter=on&grid=none&stretch=auto&projection=SINU&advoption=YES&info=NO&resolution=256 USGS Map-A-Planet]</em><br /> |
| + | <br /> | ||
| + | The normal - such as the perfect little bowl-shaped crater (at bottom left of the right image), and Das, the 38 km wide | ||
| + | complex crater at upper right - offer little in the way of mystery. But fortunately, the Moon also has plenty of weird | ||
| + | craters, such as the elliptical feature between the two normal ones. Mariotte, named for the discoverer of the eye's blind | ||
| + | spot, is decidedly elliptical, being about 50 x 70 km across. Elongated craters may result from very oblique impacts or | ||
| + | overlapping of two separate impacts. It is difficult to understand this odd crater. The LO image shows that the northern | ||
| + | 2/3 is full of unstructured debris, beneath steep and sheer cliffs. The southern bit is smooth, but not dark enough in the | ||
| + | Clementine view to appear to be mare basalt. But Mariotte does seem to be younger than the Orientale impact basin | ||
| + | (notice the two lines of basin secondaries to the right that don't continue over Mariotte) so it is unlikely the smooth material | ||
| + | is basin ejecta. Another oddity is the deposit of material on the eastern edge of Mariotte P, the odd-shaped crater in the | ||
| + | 7-o'clock position. This is cut by what looks more like fractures than rilles. Without much evidence I hazard a guess that | ||
| + | Mariotte was a near simultaneous double impact, but have no idea why there is a chaotic jumbled part and a smooth part | ||
| + | of the floor. And did the fractured material in P simply slide down that crater's wall, or is it somehow related to its odd neighbor? | ||
| + | <br /> | ||
| + | <br /> | ||
| + | <em>[mailto:tychocrater@yahoo.com Chuck Wood]</em><br /> | ||
<br /> | <br /> | ||
<strong>Related Links</strong><br /> | <strong>Related Links</strong><br /> | ||
| Line 11: | Line 27: | ||
Zond 8 [http://www.mentallandscape.com/C_Zond08_25.jpg view] (pointed out by Danny Caes)<br /> | Zond 8 [http://www.mentallandscape.com/C_Zond08_25.jpg view] (pointed out by Danny Caes)<br /> | ||
<br /> | <br /> | ||
| + | <p><b>Yesterday's LPOD:</b> [[October 23, 2009|Trail of Skylights]] </p> | ||
| + | <p><b>Tomorrow's LPOD:</b> [[October 25, 2009|Red Arrowhead]] </p> | ||
<hr /> | <hr /> | ||
| − | + | {{wiki/ArticleFooter}} | |
| − | |||
| − | |||
| − | |||
Latest revision as of 12:57, 15 March 2015
Das Mystery
Lunar Orbiter (left) and Clementine (right) images from USGS Map-A-Planet
The normal - such as the perfect little bowl-shaped crater (at bottom left of the right image), and Das, the 38 km wide
complex crater at upper right - offer little in the way of mystery. But fortunately, the Moon also has plenty of weird
craters, such as the elliptical feature between the two normal ones. Mariotte, named for the discoverer of the eye's blind
spot, is decidedly elliptical, being about 50 x 70 km across. Elongated craters may result from very oblique impacts or
overlapping of two separate impacts. It is difficult to understand this odd crater. The LO image shows that the northern
2/3 is full of unstructured debris, beneath steep and sheer cliffs. The southern bit is smooth, but not dark enough in the
Clementine view to appear to be mare basalt. But Mariotte does seem to be younger than the Orientale impact basin
(notice the two lines of basin secondaries to the right that don't continue over Mariotte) so it is unlikely the smooth material
is basin ejecta. Another oddity is the deposit of material on the eastern edge of Mariotte P, the odd-shaped crater in the
7-o'clock position. This is cut by what looks more like fractures than rilles. Without much evidence I hazard a guess that
Mariotte was a near simultaneous double impact, but have no idea why there is a chaotic jumbled part and a smooth part
of the floor. And did the fractured material in P simply slide down that crater's wall, or is it somehow related to its odd neighbor?
Chuck Wood
Related Links
The Clementine Atlas map 106
A higher resolution, UV-VIS Clementine view.
Zond 8 view (pointed out by Danny Caes)
Yesterday's LPOD: Trail of Skylights
Tomorrow's LPOD: Red Arrowhead
COMMENTS?
Register, Log in, and join in the comments.
