Difference between revisions of "June 27, 2004"
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=An Older Tycho= | =An Older Tycho= | ||
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− | + | <td><div align="center" span class="main_sm">Image Credit: [mailto:john@jsussenbach.nl John Sussenbach ]</div></td> | |
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− | + | <p class="story" align="center"><b>An Older Tycho</b></p> | |
− | + | <p class="story" align="left">Have you ever set up your telescope when the Moon is about 9 days old and scanning the terminator said, "Must be a great libration, Tycho is pretty far south tonight"? I have, and then I realized that I've been fooled once again by Tycho's look-alike, Moretus. Like the pair [../../../LPOD-2004-06-26.htm Eratosthenes] and [../../../LPOD-2004-02-04.htm Copernicus], Moretus is the older and over-shadowed lesser twin of one of the best known craters on the Moon. But Moretus is worth a second look for it is another classic example of a complex lunar crater. Its 114 km diameter rim steps down via one large scarp and a jumble of terraces to a flat floor 3.95 km below the rim crest. John's photo shows parallel banding in the wall - traces of the original terraces. The floor is mostly smooth (impact melt?) and this Lunar Orbiter IV [http://www.lpi.usra.edu/research/lunar_orbiter/images/img/iv_130_h2.jpg image] reveals a narrow rille that seems unusual for impact melt. There is also a large central peak and some low hills, especially to the west. Orbiter images also show subdued secondary craters to the northwest, and a search at full Moon shows that Moretus is invisible - no rays nor rim brightness remain. The lack of rays is consistent with the number of superposed impact craters on Moretus' floor - it is an older crater of [../../../LPOD-2004-02-23.htm Eratosthenian] age. | |
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− | + | <p align="right" class="story">— [mailto:tychocrater@yahoo.com Chuck Wood]</blockquote> | |
− | + | <p class="story" align="left"><b>Technical Details:</b><br> | |
− | + | April 11, 2003. C11 and 2 x Barlow plus Toucam Pro.</p> | |
− | + | <p class="story"><b>Related Links:</b><br> | |
− | + | [http://www.jsussenbach.nl/ Sussenbach's Digital Astroimaging Site]<br> | |
− | + | [http://www.lpi.usra.edu/research/lunar_orbiter/images/img/iv_118_h2.jpg Lunar Orbiter IV View] | |
− | + | </p> | |
− | + | <p class="story"> <b>Tomorrow's LPOD:</b> LACs and More!</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 18:21, 4 January 2015
An Older Tycho
Image Credit: John Sussenbach |
An Older Tycho Have you ever set up your telescope when the Moon is about 9 days old and scanning the terminator said, "Must be a great libration, Tycho is pretty far south tonight"? I have, and then I realized that I've been fooled once again by Tycho's look-alike, Moretus. Like the pair [../../../LPOD-2004-06-26.htm Eratosthenes] and [../../../LPOD-2004-02-04.htm Copernicus], Moretus is the older and over-shadowed lesser twin of one of the best known craters on the Moon. But Moretus is worth a second look for it is another classic example of a complex lunar crater. Its 114 km diameter rim steps down via one large scarp and a jumble of terraces to a flat floor 3.95 km below the rim crest. John's photo shows parallel banding in the wall - traces of the original terraces. The floor is mostly smooth (impact melt?) and this Lunar Orbiter IV image reveals a narrow rille that seems unusual for impact melt. There is also a large central peak and some low hills, especially to the west. Orbiter images also show subdued secondary craters to the northwest, and a search at full Moon shows that Moretus is invisible - no rays nor rim brightness remain. The lack of rays is consistent with the number of superposed impact craters on Moretus' floor - it is an older crater of [../../../LPOD-2004-02-23.htm Eratosthenian] age. Technical Details: Related Links: Tomorrow's LPOD: LACs and More! |
Author & Editor: Technical Consultant: A service of: |
COMMENTS?
Click on this icon File:PostIcon.jpg at the upper right to post a comment.