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=An Excess of Craters= | =An Excess of Craters= | ||
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| − | + | <td><div align="center" span class="main_sm">Image Credit: [http://www.lpi.usra.edu/science/kiefer/Education/SSRG2-Craters/craterstructure.html Apollo 16 Metric Frame AS16-M0728] </div></td> | |
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| − | + | <p class="story" align="center"><b>An Excess of Craters</b></p> | |
| − | + | <p class="story" align="left"> | |
I worked my way through college by measuring lunar craters for the System of Lunar Craters catalog published by the Lunar & Planetary Lab in the early 1960s. I am glad that this image of the middle of the lunar farside was not available then - it is a crater counter's nightmare! The dark-floored crater - one of the rare example of low albedo maria material far from the Big Backside Basin - is 53 km wide Kohlschutter (14N, 154E) and the entire area is pockmarked with smaller craters. Perhaps this is simply an ancient surface, as suggested by its many craters, but I wonder if the fact that they are mostly 15-30 km wide and appear similar in age means they are basin secondary craters? This area is surrounded by large impact basins - Freundlich-Sharonov to the E, Keeler-Heaviside to the S, Mendeleev to the W and, just visible as a limb flattening, Moscoviense to the N. The problem is all of these basin appear to be older than their putative secondaries! But Wilhelms, in his Geologic History of the Moon (p 85), also interprets this multitude of craters as secondaries and proposes Mendeleev as the source. So, if I'm wrong, I am in great company! | I worked my way through college by measuring lunar craters for the System of Lunar Craters catalog published by the Lunar & Planetary Lab in the early 1960s. I am glad that this image of the middle of the lunar farside was not available then - it is a crater counter's nightmare! The dark-floored crater - one of the rare example of low albedo maria material far from the Big Backside Basin - is 53 km wide Kohlschutter (14N, 154E) and the entire area is pockmarked with smaller craters. Perhaps this is simply an ancient surface, as suggested by its many craters, but I wonder if the fact that they are mostly 15-30 km wide and appear similar in age means they are basin secondary craters? This area is surrounded by large impact basins - Freundlich-Sharonov to the E, Keeler-Heaviside to the S, Mendeleev to the W and, just visible as a limb flattening, Moscoviense to the N. The problem is all of these basin appear to be older than their putative secondaries! But Wilhelms, in his Geologic History of the Moon (p 85), also interprets this multitude of craters as secondaries and proposes Mendeleev as the source. So, if I'm wrong, I am in great company! | ||
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| − | + | <p align="right" class="story">— [mailto:tychocrater@yahoo.com Chuck Wood]</blockquote> | |
| − | + | <p class="story"><b>Related Links:</b> <br> | |
| − | + | [http://www.lpi.usra.edu/research/lunar_orbiter/images/aimg/v_103_m.jpg Lunar Orbiter V View] </p> | |
| − | + | <p class="story"><b>Tomorrow's LPOD:</b> Pre-History of the Triesnecker Area</p> | |
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| − | + | <td><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></td> | |
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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 17:22, 4 January 2015
An Excess of Craters
[javascript:;" onMouseOver="MM_swapImage('Image1',,'images/LPOD-2004-07-24b.jpeg',1)" onMouseOut="MM_swapImgRestore() |
Image Credit: Apollo 16 Metric Frame AS16-M0728 |
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An Excess of Craters I worked my way through college by measuring lunar craters for the System of Lunar Craters catalog published by the Lunar & Planetary Lab in the early 1960s. I am glad that this image of the middle of the lunar farside was not available then - it is a crater counter's nightmare! The dark-floored crater - one of the rare example of low albedo maria material far from the Big Backside Basin - is 53 km wide Kohlschutter (14N, 154E) and the entire area is pockmarked with smaller craters. Perhaps this is simply an ancient surface, as suggested by its many craters, but I wonder if the fact that they are mostly 15-30 km wide and appear similar in age means they are basin secondary craters? This area is surrounded by large impact basins - Freundlich-Sharonov to the E, Keeler-Heaviside to the S, Mendeleev to the W and, just visible as a limb flattening, Moscoviense to the N. The problem is all of these basin appear to be older than their putative secondaries! But Wilhelms, in his Geologic History of the Moon (p 85), also interprets this multitude of craters as secondaries and proposes Mendeleev as the source. So, if I'm wrong, I am in great company! Related Links: Tomorrow's LPOD: Pre-History of the Triesnecker Area |
Author & Editor: Technical Consultant: A service of: |
COMMENTS?
Click on this icon File:PostIcon.jpg at the upper right to post a comment.
