Difference between revisions of "June 27, 2004"

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=An Older Tycho=
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      <td><h2 align="left">An Older Tycho</h2></td>
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      <td><h2 align="right">June 27, 2004</h2></td>
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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>
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  <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">&#8212; [mailto:chuck@observingthesky.org Chuck Wood]</blockquote>
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  <p class="story" align="left"><b>Technical Details:</b><br>
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    April 11, 2003. C11 and 2 x Barlow plus Toucam Pro.</p>
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  <p class"story"><b>Related Links:</b><br>
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  [http://www.jsussenbach.nl/ Sussenbach's Digital Astroimaging Site]<br>
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  [http://www.lpi.usra.edu/research/lunar_orbiter/images/img/iv_118_h2.jpg Lunar Orbiter IV View]
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  </p>
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  <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>
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          [mailto:chuck@observingthesky.org Charles A. Wood]</p>
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        <p align="center" class="main_titles"><b>Technical Consultant:</b><br>
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            [mailto:anthony@perseus.gr Anthony Ayiomamitis]</p>
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        <p align="center" class="main_titles"><b>[mailto:webmaster@entropysponge.com Contact Webmaster]</b></p>
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        <p align="center" class="main_titles"><b>A service of:</b><br>
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            <a class="one" href="http://www.observingthesky.org/">ObservingTheSky.Org</a></p>
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        <p align="center" class="main_titles"><b>Visit these other PODs:</b> <br>
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          <a class="one" href="http://antwrp.gsfc.nasa.gov/apod/astropix.html">Astronomy</a> | <a class="one" href="http://www.msss.com/">Mars</a> | <a class="one" href="http://epod.usra.edu/">Earth</a></p></td>
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Revision as of 15:40, 4 January 2015

An Older Tycho

An Older Tycho

June 27, 2004

<img src="images/LPOD-2004-06-27.jpeg" name="Image1" width="400" height="318" border="0" id="Image1">

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.

Chuck Wood

Technical Details:
April 11, 2003. C11 and 2 x Barlow plus Toucam Pro.

Related Links:
Sussenbach's Digital Astroimaging Site
Lunar Orbiter IV View

Tomorrow's LPOD: LACs and More!

<img src="../../../MainPage/spacer.gif" width="640" height="1">


Author & Editor:
Charles A. Wood

Technical Consultant:
Anthony Ayiomamitis

Contact Webmaster

A service of:
<a class="one" href="http://www.observingthesky.org/">ObservingTheSky.Org</a>

Visit these other PODs:
<a class="one" href="http://antwrp.gsfc.nasa.gov/apod/astropix.html">Astronomy</a> | <a class="one" href="http://www.msss.com/">Mars</a> | <a class="one" href="http://epod.usra.edu/">Earth</a>

 



COMMENTS?

Click on this icon File:PostIcon.jpg at the upper right to post a comment.