Difference between revisions of "December 4, 2009"
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=Rayology= | =Rayology= | ||
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| − | <em>north to left [http://lpod.org/coppermine/displayimage.php?pos=-4350 | + | <em>north to left [http://lpod.org/coppermine/displayimage.php?pos=-4350 image] by [mailto:HowardEskildsen@msn.com Howard Eskildsen]</em><br /> |
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| − | We don't understand rays well enough. Back in 1960 Shoemaker showed that they were ejecta from impact craters, and sometime in the 90s B. Ray Hawke and his colleagues recognized that rays could have two components, freshly pulverized rocks and bright highland rocks. So we know something about their emplacement and composition. But their shapes and lengths and even their non-radiality are not well understood. The rays emanating from the two little [ | + | We don't understand rays well enough. Back in 1960 Shoemaker showed that they were ejecta from impact craters, and sometime in the 90s B. Ray Hawke and his colleagues recognized that rays could have two components, freshly pulverized rocks and bright highland rocks. So we know something about their emplacement and composition. But their shapes and lengths and even their non-radiality are not well understood. The rays emanating from the two little [[October_8,_2006|craters]] on either side of Stevinus are good examples. First, these rays seem to be very long for the small diameters (8 and 12 km) of their source craters. Second, note the broad rays to their north (left) that are not all radial to them - how exactly, do non-radial rays form? And, as we've commented before. the shapes of rays have never been studied and classified. Who will be a champion ray researcher?<br /> |
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| − | <em>[mailto:tychocrater@yahoo.com | + | <em>[mailto:tychocrater@yahoo.com Chuck Wood]</em><br /> |
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<strong>Technical Details</strong><br /> | <strong>Technical Details</strong><br /> | ||
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<strong>Related Links</strong><br /> | <strong>Related Links</strong><br /> | ||
| − | Rükl plates [ | + | Rükl plates [https://the-moon.us/wiki/R%C3%BCkl_59 59] & [https://the-moon.us/wiki/R%C3%BCkl_69 69]<br /> |
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| + | <p><b>Yesterday's LPOD:</b> [[December 3, 2009|Volcanic Hinterland]] </p> | ||
| + | <p><b>Tomorrow's LPOD:</b> [[December 5, 2009|Terminator Tales]] </p> | ||
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Latest revision as of 18:45, 13 October 2018
Rayology
north to left image by Howard Eskildsen
We don't understand rays well enough. Back in 1960 Shoemaker showed that they were ejecta from impact craters, and sometime in the 90s B. Ray Hawke and his colleagues recognized that rays could have two components, freshly pulverized rocks and bright highland rocks. So we know something about their emplacement and composition. But their shapes and lengths and even their non-radiality are not well understood. The rays emanating from the two little craters on either side of Stevinus are good examples. First, these rays seem to be very long for the small diameters (8 and 12 km) of their source craters. Second, note the broad rays to their north (left) that are not all radial to them - how exactly, do non-radial rays form? And, as we've commented before. the shapes of rays have never been studied and classified. Who will be a champion ray researcher?
Chuck Wood
Technical Details
11/30/2009; 02:08 UT. Meade 6", f/8 Refractor + DMK 41AU02.AS, 2-image composite
Related Links
Rükl plates 59 & 69
Yesterday's LPOD: Volcanic Hinterland
Tomorrow's LPOD: Terminator Tales
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