Difference between revisions of "May 27, 2004"
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=The Jura and a Missing Rim= | =The Jura and a Missing Rim= | ||
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| − | + | [[File:LPOD-2004-05-27.jpeg|LPOD-2004-05-27.jpeg]]] | |
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| − | + | <td colspan="2"><div align="center"> | |
| − | + | <p class="main_sm">Image Credit: [mailto:gmengoli@libero.it Giorgio Mengoli]</p> | |
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| − | + | <td><p class="Story" align="center"><b>The Jura and a Missing Rim</b></p> | |
| − | + | <p class="story" align="left">The Jura Mts are part of the rim of the Sinus Iridum impact crater. There is probably a fault along the Imbrium side of the crater that down-dropped the missing rim, and then later Imbrium lavas covered it. About 50 years ago Harold Urey proposed that Sinus Iridum marked ground zero for the projectile that formed Imbrium - it would have been an oblique impact with the grand explosion occurring near the center of Imbrium. That is wrong - Sinus Iridum was formed after Imbrium. Urey, the chemist, didn't understand geologic superposition - Iridum is formed on top of Imbrium, therefore it had to have formed afterwards. The location of the northern rim of the Imbrium impact basin is controversial because it is so poorly defined. Some people put it under Plato and Sinus Iridum, some place it in Mare Frigoris and others say it is north of there. I prefer the Plato arc because of what I called the tyranny of the circle in The Modern Moon. Basins are closely circular in outline, so if there is little to no evidence for the rim, put it on the circle inferred from the Carpathians and Apennines. And that circle passes under Plato and Sinus Iridum. </p> | |
| − | + | <p class="story" align="left"><b>Technical Details:</b><br> | |
| − | + | Cassegrain 210mm. and HX516 ccd. Mouseover to see crater names.</p> | |
| − | + | <p class="story"><b>Related Links:</b><br> | |
| − | + | [http://digilander.libero.it/gm2/index.htm Giorgio's Website]<br> | |
| − | + | [http://www.lpi.usra.edu/research/lunar_orbiter/bin/info.shtml?335 An Imbrium-Centered View]</p> | |
| − | + | <p class="story"><b>Tomorrow's LPOD:</b> Whence the Bessel Ray?</p> | |
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| − | + | <hr> | |
| − | + | <p align="center" class="main_titles"><b>Author & Editor:</b><br> | |
| − | + | [mailto:tychocrater@yahoo.com Charles A. Wood]</p> | |
| − | + | <p align="center" class="main_titles"><b>Technical Consultant:</b><br> | |
| − | + | [mailto:anthony@perseus.gr Anthony Ayiomamitis]</p> | |
| − | + | <p align="center" class="main_titles"><b>A service of:</b><br> | |
| − | + | [http://www.observingthesky.org/ ObservingTheSky.Org]</p> | |
| − | + | <p align="center" class="main_titles"><b>Visit these other PODs:</b> <br> | |
| − | + | [http://antwrp.gsfc.nasa.gov/apod/astropix.html Astronomy] | [http://www.msss.com/ Mars] | [http://epod.usra.edu/ Earth]</p> | |
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===COMMENTS?=== | ===COMMENTS?=== | ||
Click on this icon [[image:PostIcon.jpg]] at the upper right to post a comment. | Click on this icon [[image:PostIcon.jpg]] at the upper right to post a comment. | ||
Revision as of 18:20, 4 January 2015
The Jura and a Missing Rim
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onMouseOver = "document.images['Pic1But'].src='images/LPOD-2004-05-27b.jpeg';
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onMouseOut = "document.images['Pic1But'].src='images/LPOD-2004-05-27.jpeg';
return false
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Image Credit: Giorgio Mengoli |
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The Jura and a Missing Rim The Jura Mts are part of the rim of the Sinus Iridum impact crater. There is probably a fault along the Imbrium side of the crater that down-dropped the missing rim, and then later Imbrium lavas covered it. About 50 years ago Harold Urey proposed that Sinus Iridum marked ground zero for the projectile that formed Imbrium - it would have been an oblique impact with the grand explosion occurring near the center of Imbrium. That is wrong - Sinus Iridum was formed after Imbrium. Urey, the chemist, didn't understand geologic superposition - Iridum is formed on top of Imbrium, therefore it had to have formed afterwards. The location of the northern rim of the Imbrium impact basin is controversial because it is so poorly defined. Some people put it under Plato and Sinus Iridum, some place it in Mare Frigoris and others say it is north of there. I prefer the Plato arc because of what I called the tyranny of the circle in The Modern Moon. Basins are closely circular in outline, so if there is little to no evidence for the rim, put it on the circle inferred from the Carpathians and Apennines. And that circle passes under Plato and Sinus Iridum. Technical Details: Related Links: Tomorrow's LPOD: Whence the Bessel Ray? |
Author & Editor:
Charles A. Wood
Technical Consultant:
Anthony Ayiomamitis
A service of:
ObservingTheSky.Org
Visit these other PODs:
Astronomy | Mars | Earth
COMMENTS?
Click on this icon File:PostIcon.jpg at the upper right to post a comment.
