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| | =Which Way is Downslope?= | | =Which Way is Downslope?= |
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| + | <p>[[File:06-11-02RimaSharp-LPOD.jpg|06-11-02RimaSharp-LPOD.jpg]]</p> |
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| − | <p>[[File:06-11-02RimaSharp-LPOD.jpg|06-11-02RimaSharp-LPOD.jpg]]</p> | |
| | <p><em>image by [mailto:slamm@blueyonder.co.uk Stefan Lammel], Uxbridge, England. Mairan is the crater at lower right.</em></p> | | <p><em>image by [mailto:slamm@blueyonder.co.uk Stefan Lammel], Uxbridge, England. Mairan is the crater at lower right.</em></p> |
| − | <p>There are 111 [http://the-moon.wikispaces.com/Lunar+Rilles named lunar rilles] and most are challenging to observe and image. Like craters, most attention is focused on just a few famous ones (Hadley, Ariadaeus, Hyginus, Petavius), and the rest are overlooked. One of the difficult ones is the [http://the-moon.wikispaces.com/Rima+Sharp Sharp Rille] in north-eastern Oceanus Procellarum near the western shore of [http://www.lpod.org/?m=20060128 Terra Laboris]. This is a languorously sinuous rille that appears to start at a circular pit just at the top right of Stefan’s image, and according to a recent estimate by Jim Mosher it flows about 270 km towards the south. Although the general nature of sinuous rilles is well understood from modeling and observations of terrestrial lava tubes and channels, the explanation of the details of rilles is often uncertain. The Sharp rille is wide and relatively deep for its first 50 km (between the two headlands, but then makes a strange large detour around a small crater and continues southward as a less deep feature, finally disappearing a little south of the steep-sided volcanic cone [http://www.lpod.org/?m=20060526 Mairan T]. Stefan points out that the southern end of the Sharp Rille is only about 25 km from the northern end of the [http://the-moon.wikispaces.com/Rima+Mairan Mairan Rille], and a Lunar Orbiter IV [http://www.lpi.usra.edu/resources/lunarorbiter/images/print/4158_h2.jpg image] shows very narrow rilles filling part of the gap. This lead me to speculate that the two big rilles may once have connected, but that seems unlikely because the head of the Mairan Rille is at its south end. Once we get good topography of this area (from Kaguya or Chang’e) we will see which way the terrain slopes. Since both the Mairan and Sharp rilles seem to flow toward the gap between them, presumably that is the lowest local area. </p> | + | <p>There are 111 [https://the-moon.us/wiki/Lunar_Rilles named lunar rilles] and most are challenging to observe and image. Like craters, most attention is focused on just a few famous ones (Hadley, Ariadaeus, Hyginus, Petavius), and the rest are overlooked. One of the difficult ones is the [https://the-moon.us/wiki/Rima_Sharp Sharp Rille] in north-eastern Oceanus Procellarum near the western shore of [[January_28,_2006|Terra Laboris]]. This is a languorously sinuous rille that appears to start at a circular pit just at the top right of Stefan’s image, and according to a recent estimate by Jim Mosher it flows about 270 km towards the south. Although the general nature of sinuous rilles is well understood from modeling and observations of terrestrial lava tubes and channels, the explanation of the details of rilles is often uncertain. The Sharp rille is wide and relatively deep for its first 50 km (between the two headlands, but then makes a strange large detour around a small crater and continues southward as a less deep feature, finally disappearing a little south of the steep-sided volcanic cone [[May_26,_2006|image]] shows very narrow rilles filling part of the gap. This lead me to speculate that the two big rilles may once have connected, but that seems unlikely because the head of the Mairan Rille is at its south end. Once we get good topography of this area (from Kaguya or Chang’e) we will see which way the terrain slopes. Since both the Mairan and Sharp rilles seem to flow toward the gap between them, presumably that is the lowest local area. </p> |
| | <p>[mailto:tychocrater@yahoo.com Chuck Wood]</p> | | <p>[mailto:tychocrater@yahoo.com Chuck Wood]</p> |
| − | <p><stro g>Technical Details:<br /> | + | <p><strong>Technical Details:</strong><br /> |
| | 2nd November 2006. 10in f4.8 Newtonian, DMK 21AF04, 4x PowerMate, red filter, 1/30s, gain 600, 900/4000, MAP: 26-29x 64, Registax v4, PSE 5, Focus Magic.</p> | | 2nd November 2006. 10in f4.8 Newtonian, DMK 21AF04, 4x PowerMate, red filter, 1/30s, gain 600, 900/4000, MAP: 26-29x 64, Registax v4, PSE 5, Focus Magic.</p> |
| | <p><strong>Related Links:</strong><br /> | | <p><strong>Related Links:</strong><br /> |
| | Rükl chart 9<br /> | | Rükl chart 9<br /> |
| | [http://www.slamm.pwp.blueyonder.co.uk/moon/moon.htm Stefan’s website]</p> | | [http://www.slamm.pwp.blueyonder.co.uk/moon/moon.htm Stefan’s website]</p> |
| − | <p align="center"><em>Get ready for Christmas giving and support LPOD when you buy ANYTHING from Amazon thru [http://www.lpod.org/?page_id=591 LPOD!]</em></p> | + | <p><b>Yesterday's LPOD:</b> [[December 6, 2007|Unsolicited Advice]] </p> |
| − | <p></stro></p> | + | <p><b>Tomorrow's LPOD:</b> [[December 8, 2007|The Whole Pole]] </p> |
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