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| | <p>[[File:Iridium_AlanF.jpg|iridium_AlanF.jpg]]<br /> | | <p>[[File:Iridium_AlanF.jpg|iridium_AlanF.jpg]]<br /> |
| | <em>image by [mailto:alan@greatarrow.com Alan Friedman]</em></p> | | <em>image by [mailto:alan@greatarrow.com Alan Friedman]</em></p> |
| − | <p>Ho hum, [http://www.lpod.org/?m=200712 another] exquisite image of Sinus Iridum. I want to use it for LPOD so I’ll have to find something new to say… Wait, what is that thin line near top right between the west end of the Straight Range and the isolated peak? A little <em>Photoshop</em> unsharp mask and voila - see the dark inset at bottom right! There is definitely a squiggly interrupted line with short shadows cast on the left and slightly bright edges on the right, indicating a depression. It looks like a very closely spaced crater chain, previously unknown, I think. To check, the brighter insert is from Lunar Orbiter IV (from the seamless mosaic of [http://www.mapaplanet.org/explorer/moon.html Map-A-Planet]). The upper part of the chain, near shore, is definitely a secondary crater chain cluster. But the bottom part doesn’t show as chain on the Orbiter image, in fact there is hardly anything there at all at that magnification. But blow up the Orbiter image and there is a very narrow sinuous rille! It starts near the eastern side of the Prom. Laplace, wanders pass the isolated peak, crosses the mare ridge, and abruptly turns south and disappears. Comparison to the nearby 11 km wide Laplace D crater shows that this sinuous rille is about 500 m wide. Not bad for a 10″ Mak in Buffalo! More about the rille tomorrow.</p> | + | <p>Ho hum, [[December_31,_2007|Map-A-Planet]]). The upper part of the chain, near shore, is definitely a secondary crater chain cluster. But the bottom part doesn’t show as chain on the Orbiter image, in fact there is hardly anything there at all at that magnification. But blow up the Orbiter image and there is a very narrow sinuous rille! It starts near the eastern side of the Prom. Laplace, wanders pass the isolated peak, crosses the mare ridge, and abruptly turns south and disappears. Comparison to the nearby 11 km wide Laplace D crater shows that this sinuous rille is about 500 m wide. Not bad for a 10″ Mak in Buffalo! More about the rille tomorrow.</p> |
| | <p>[mailto:tychocrater@yahoo.com Chuck Wood]</p> | | <p>[mailto:tychocrater@yahoo.com Chuck Wood]</p> |
| | <p><strong>Technical Details:</strong><br /> | | <p><strong>Technical Details:</strong><br /> |
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| | Rükl chart 11<br /> | | Rükl chart 11<br /> |
| | Alan’s [http://www.avertedimagination.com website].<br /> | | Alan’s [http://www.avertedimagination.com website].<br /> |
| − | The rille is just there in Mike Wirth’s [http://www.lpod.org/?m=20060820 image].</p> | + | The rille is just there in Mike Wirth’s [[August_20,_2006|image]].</p> |
| | <p><b>Yesterday's LPOD:</b> [[January 14, 2008|Voyage To a Twin World?]] </p> | | <p><b>Yesterday's LPOD:</b> [[January 14, 2008|Voyage To a Twin World?]] </p> |
| | <p><b>Tomorrow's LPOD:</b> [[January 17, 2008|Prom. Laplace Rilles]] </p> | | <p><b>Tomorrow's LPOD:</b> [[January 17, 2008|Prom. Laplace Rilles]] </p> |
