Difference between revisions of "February 1, 2004"
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=Theophilus= | =Theophilus= | ||
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| − | + | <td colspan="2"><div align="center"> | |
| − | + | [[File:LPOD-2004-02-01.jpeg|LPOD-2004-02-01.jpeg]]</div> | |
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| − | + | <td><div align="center" span class="main_sm">Image Credit: [http://www.hq.nasa.gov/office/pao/History/SP-362/ch5.5.htm Apollo 16 (AS16-0692)]</div></td> | |
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<table class="story" border="0" bgcolor="#FFFFFF" width="90%" cellpadding="10" align="center"><tr><td> | <table class="story" border="0" bgcolor="#FFFFFF" width="90%" cellpadding="10" align="center"><tr><td> | ||
| − | + | <p class="story" align="center"><b>Theophilus </b></p> | |
| − | + | <p class="story" align="left">If Copernicus is the king of lunar craters, Theophilus is at least a duke, if not a prince. Theophilus is a 100 km wide, | |
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4.4 km deep complex impact crater. This oblique Apollo 16 view clearly shows the trademark features of a complex crater: | 4.4 km deep complex impact crater. This oblique Apollo 16 view clearly shows the trademark features of a complex crater: | ||
terraced walls, flat floor, and massive central peaks. Because its secondary craters and rays are less well preserved | terraced walls, flat floor, and massive central peaks. Because its secondary craters and rays are less well preserved | ||
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the two dark halo craters to the middle left. These appear to be normal small impact pits that have excavated buried mare | the two dark halo craters to the middle left. These appear to be normal small impact pits that have excavated buried mare | ||
material from under the bright ejecta of Theophilus. </p> | material from under the bright ejecta of Theophilus. </p> | ||
| − | + | <p class="story"><b>Related Links:</b><br> | |
| − | + | [http://www.hq.nasa.gov/office/pao/History/SP-362/contents.htm Apollo Over the Moon: The View from Orbit (NASA SP-362)]<br> | |
| − | + | [http://www.lpi.usra.edu/research/lunar_orbiter/images/img/iv_077_h2.jpg Lunar Orbiter view]</p> | |
| − | + | <p class="story"> <b>Tomorrow's LPOD:</b> Brightness at Noon</p> | |
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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>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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<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 17:15, 4 January 2015
Theophilus
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Image Credit: Apollo 16 (AS16-0692) |
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Theophilus If Copernicus is the king of lunar craters, Theophilus is at least a duke, if not a prince. Theophilus is a 100 km wide, 4.4 km deep complex impact crater. This oblique Apollo 16 view clearly shows the trademark features of a complex crater: terraced walls, flat floor, and massive central peaks. Because its secondary craters and rays are less well preserved than those at Copernicus, Theophilus must be older. Don Wilhelms, a retired US Geologic Survey lunar expert, has classified Theophilus as Erastothenian in relative age - that is, somewhere between 1.1 and 3.2 billion years old. Its faint rays - can you see them at full Moon? - suggest that Theophilus is at the young end of that range. Finally, note the two dark halo craters to the middle left. These appear to be normal small impact pits that have excavated buried mare material from under the bright ejecta of Theophilus. Related Links: Tomorrow's LPOD: Brightness at Noon |
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Author & Editor: Technical Consultant: A service of: |
COMMENTS?
Click on this icon File:PostIcon.jpg at the upper right to post a comment.
