Difference between revisions of "February 1, 2004"
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| − | + | <table width="640" border="0" align="center" cellpadding="6" cellspacing="2"> | |
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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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| + | <table width="100%" border="0" cellpadding="8"> | ||
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| + | <td><div align="center"><p>Image Credit: [http://www.hq.nasa.gov/office/pao/History/SP-362/ch5.5.htm Apollo 16 (AS16-0692)]</p></div></td> | ||
| + | </tr> | ||
| + | </table> | ||
| + | <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, | ||
| + | 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. </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><b>Yesterday's LPOD:</b> [[January 31, 2004|Hooke & Hipparchus]] </p> | ||
| + | <p><b>Tomorrow's LPOD:</b> [[February 2, 2004|Brightness at Noon]] </p> | ||
| + | </td></tr> | ||
| + | </table> | ||
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| + | <table width="100%" border="0" cellspacing="2" cellpadding="4"> | ||
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| + | <td><hr></td> | ||
| + | </tr> | ||
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| + | <td> | ||
| + | <p align="center" class="main_titles"><b>Author & Editor:</b><br> | ||
| + | [mailto:tychocrater@yahoo.com Charles A. Wood]</p> | ||
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| + | <p> </p> | ||
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Latest revision as of 19:11, 7 February 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: Yesterday's LPOD: Hooke & Hipparchus Tomorrow's LPOD: Brightness at Noon |
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Author & Editor: |
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