Difference between revisions of "March 29, 2005"
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− | + | <td width="50%"><h2><nobr>Mee Too!!</nobr></h2></td> | |
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− | + | <tr><td><div align="center" class="main_sm">Image Credit: [mailto:ralph_a47.hotmail.com Carmelo Zannelli]</p> | |
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− | + | <p align="center"><b>Mee Too!!</b></p> | |
− | + | <p align="left">The Moon is a messy target. An incoming projectile has only about a 17% chance of striking a relatively flat area; most impacts occurred on top of existing craters. This causes uneven ejecta distribution and even low spots in the new craters rim where it cuts into the older crater. The Hainzel-Mee crater cluster is an even more complex crater group with impacts on top of impacts on top of impacts. The oldest feature in this sequence is the very poorly defined 132 km wide ruined crater Mee. The small crater Mee F was later formed as a normal crater but its rim was destroyed when smooth plains were formed on part of Mees floor. The 70 km wide crater Hainzel cut into Mees floor sometime before the smooth plains were emplaced (because the plains embay Hainzels rim). Hainzel A and C are an odd pair. Both overlap Hainzel but it is difficult to see which is younger. Hainzel A looks younger because of its central peak and superb rim terraces and its radial lineations to the north. However, instead of a clear crater rim overlapping C, there is simply a partial ridge between the two craters. Did Hainzel A and C form simultaneously? Even the Lunar Orbiter IV image does not answer that question! This image raises again questions of the naming of craters. Why is an old and obscured crater given the name Hainzel, while the remarkable and fresher crater A merely has a letter designation? This is not an isolated blunder, check out boring Epimenides and its brighter subsidiary S. And why does the odd ruin Mee warrant a name at all? Sometimes I think that a fresh look at lunar nomenclature, unencumbered by national pride, could yield a more consistent and useful nomenclature. But 300 years of mistakes, oops, I mean tradition, cant be set aside so cavalierly!</p> | |
− | + | <blockquote><p align="right">— [mailto:tychocrater@yahoo.com Chuck Wood]</blockquote> | |
<p align="left"><p><b>Technical Details:</b><br> | <p align="left"><p><b>Technical Details:</b><br> | ||
Mar 22, 2005. 235 mm SC _ Vesta Pro webcame + IR-cut off filter. 300 of 1500 frames stacked with Iris 4.32</p> | Mar 22, 2005. 235 mm SC _ Vesta Pro webcame + IR-cut off filter. 300 of 1500 frames stacked with Iris 4.32</p> | ||
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<br>Rukl Plate 63 | <br>Rukl Plate 63 | ||
<p align="left"><b>Tomorrow's LPOD: </b> A Looong Lunar Exposure</p> | <p align="left"><b>Tomorrow's LPOD: </b> A Looong Lunar Exposure</p> | ||
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− | + | <td><hr></td> | |
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− | + | <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>Contact Translator:</b><br> | |
− | + | [mailto:pablolonnie@yahoo.com.mx" class="one Pablo Lonnie Pacheco Railey] (Es)<br> | |
− | + | [mailto:chlegrand@free.fr" class="one Christian Legrand] (Fr)</p> | |
− | + | <p align="center" class="main_titles"><b>[mailto:webuser@observingthesky.org Contact Webmaster]</b></p> | |
− | + | <p align="center" class="main_titles"><b>A service of:</b><br> | |
− | + | [http://www.observingthesky.org/" class="one ObservingTheSky.Org]</p> | |
− | + | <p align="center" class="main_titles"><b>Visit these other PODs:</b> <br> | |
− | + | [http://antwrp.gsfc.nasa.gov/apod/astropix.html" class="one Astronomy] | [http://www.msss.com/" class="one Mars] | [http://epod.usra.edu/" class="one Earth]</p> | |
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<p> </p> | <p> </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 18:30, 4 January 2015
Mee Too!!
<nobr>Mee Too!!</nobr> |
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Image Credit: Carmelo Zannelli
|
Mee Too!! The Moon is a messy target. An incoming projectile has only about a 17% chance of striking a relatively flat area; most impacts occurred on top of existing craters. This causes uneven ejecta distribution and even low spots in the new craters rim where it cuts into the older crater. The Hainzel-Mee crater cluster is an even more complex crater group with impacts on top of impacts on top of impacts. The oldest feature in this sequence is the very poorly defined 132 km wide ruined crater Mee. The small crater Mee F was later formed as a normal crater but its rim was destroyed when smooth plains were formed on part of Mees floor. The 70 km wide crater Hainzel cut into Mees floor sometime before the smooth plains were emplaced (because the plains embay Hainzels rim). Hainzel A and C are an odd pair. Both overlap Hainzel but it is difficult to see which is younger. Hainzel A looks younger because of its central peak and superb rim terraces and its radial lineations to the north. However, instead of a clear crater rim overlapping C, there is simply a partial ridge between the two craters. Did Hainzel A and C form simultaneously? Even the Lunar Orbiter IV image does not answer that question! This image raises again questions of the naming of craters. Why is an old and obscured crater given the name Hainzel, while the remarkable and fresher crater A merely has a letter designation? This is not an isolated blunder, check out boring Epimenides and its brighter subsidiary S. And why does the odd ruin Mee warrant a name at all? Sometimes I think that a fresh look at lunar nomenclature, unencumbered by national pride, could yield a more consistent and useful nomenclature. But 300 years of mistakes, oops, I mean tradition, cant be set aside so cavalierly! Technical Details: Related Links: Tomorrow's LPOD: A Looong Lunar Exposure |
Author & Editor: Technical Consultant: Contact Translator: A service of: Visit these other PODs: |
COMMENTS?
Click on this icon File:PostIcon.jpg at the upper right to post a comment.