Difference between revisions of "March 26, 2005"

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    <tr><td><div align="center" class="main_sm">Image Credit: [mailto:starman2@charter.net Wes Higgins]</p>
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<tr><td><div align="center" class="main_sm"><p>Image Credit: [mailto:starman2@charter.net Wes Higgins]</p>
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<p align="center"><b>A Long Crater</b></p>
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<p align="left">Schiller is not the largest crater on the Moon but it is probably the least circular. Its length of 180 km and width of 70 km implies that it has had an unusual origin, as discussed in a previous [http://www.lpod.org/LPOD-2004-11-12.htm LPOD.] In this high resolution image we can examine more closely Schiller’s interior and surroundings. I placed the image with south up to better show the hints of downslope movement on the walls.  The walls also show a smoothed-over remnant of a single large terrace. The smooth floor is broken by a few dozen small crater pits, those in clusters are probably secondaries. Smooth material also fills the floors of many nearby craters. As near [http://www.lpod.org/LPOD-2005-03-25.htm Pitiscus] this smooth material looks like mare lava, but lacks the dark color at high sun that is caused by the iron and magnesium in mare basalts. The prevailing theory is that light smooth plains are fluidized ejecta widely dispersed by the formation of the Orientale basin. The problem with this explanation is that counts of craters on Schiller’s smooth floor implies that that material is 100 million years younger than the Orientale formation. Another possibility is that the smooth material is normal basalt, veneered with bright dust from later impacts. Such cryptomaria exist nearby, but small craters in Schiller don’t have dark haloes from underlying basalt, so that explanation doesn’t work either. As I said yesterday, some - maybe all - light-hued smooth plains may be an unsampled type of volcanism, but so far there is no proof.
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<p align="left">Schiller is not the largest crater on the Moon but it is probably the least circular. Its length of 180 km and width of 70 km implies that it has had an unusual origin, as discussed in a previous [[November_12,_2004|LPOD.]] In this high resolution image we can examine more closely Schiller’s interior and surroundings. I placed the image with south up to better show the hints of downslope movement on the walls.  The walls also show a smoothed-over remnant of a single large terrace. The smooth floor is broken by a few dozen small crater pits, those in clusters are probably secondaries. Smooth material also fills the floors of many nearby craters. As near [[March_25,_2005|Pitiscus]] this smooth material looks like mare lava, but lacks the dark color at high sun that is caused by the iron and magnesium in mare basalts. The prevailing theory is that light smooth plains are fluidized ejecta widely dispersed by the formation of the Orientale basin. The problem with this explanation is that counts of craters on Schiller’s smooth floor implies that that material is 100 million years younger than the Orientale formation. Another possibility is that the smooth material is normal basalt, veneered with bright dust from later impacts. Such cryptomaria exist nearby, but small craters in Schiller don’t have dark haloes from underlying basalt, so that explanation doesn’t work either. As I said yesterday, some - maybe all - light-hued smooth plains may be an unsampled type of volcanism, but so far there is no proof.
 
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<blockquote><p align="right">&#8212; [mailto:tychocrater@yahoo.com Chuck Wood]</blockquote>
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<p align="left"><p><b>Technical Details:</b><br>
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<p align="right">&#8212; [mailto:tychocrater@yahoo.com Chuck Wood]</p></blockquote>
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<p align="left"><b>Technical Details:</b><br>
 
18" Starmaster Newtonian Reflector + DMK-21F04 Firewire Camera, 30FPS</p>
 
18" Starmaster Newtonian Reflector + DMK-21F04 Firewire Camera, 30FPS</p>
 
<p><b>Related Links:</b><br>
 
<p><b>Related Links:</b><br>
 
[http://www.higginsandsons.com/astro/ Wes' Web Site]
 
[http://www.higginsandsons.com/astro/ Wes' Web Site]
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<p align="left"><b>Tomorrow's LPOD: </b> Another Surprise!</p>
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<p><img src="MainPage/spacer.gif" width="640" height="1"></p></td>
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<p><b>Yesterday's LPOD:</b> [[March 25, 2005|Can You Names These Craters?]] </p>
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<p><b>Tomorrow's LPOD:</b> [[March 27, 2005|New Lunar Maps!]] </p>
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<p align="center" class="main_titles"><b>Author &amp; Editor:</b><br>  
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<p align="center" class="main_titles"><b>Author &amp; Editor:</b><br>  
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[mailto:chuck@observingthesky.org Charles A. Wood]</p>
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[mailto:tychocrater@yahoo.com 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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[mailto:pablolonnie@yahoo.com.mx" class="one Pablo Lonnie Pacheco Railey]  (Es)<br>
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[mailto:chlegrand@free.fr" class="one Christian Legrand] (Fr)</p>
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<p align="center" class="main_titles"><b>[mailto:webuser@observingthesky.org Contact Webmaster]</b></p>
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<p align="center" class="main_titles"><b>A service of:</b><br>
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[http://www.observingthesky.org/" class="one ObservingTheSky.Org]</p>
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<p align="center" class="main_titles"><b>Visit these other PODs:</b> <br>
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[http://antwrp.gsfc.nasa.gov/apod/astropix.html" class="one Astronomy] | [http://www.msss.com/" class="one Mars] | [http://epod.usra.edu/" class="one Earth]</p>
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===COMMENTS?===
 
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Click on this icon [[image:PostIcon.jpg]] at the upper right to post a comment.
 

Latest revision as of 15:12, 15 March 2015

A Long Crater

LPOD-2005-03-26.jpeg

Image Credit: Wes Higgins


A Long Crater

Schiller is not the largest crater on the Moon but it is probably the least circular. Its length of 180 km and width of 70 km implies that it has had an unusual origin, as discussed in a previous LPOD. In this high resolution image we can examine more closely Schiller’s interior and surroundings. I placed the image with south up to better show the hints of downslope movement on the walls. The walls also show a smoothed-over remnant of a single large terrace. The smooth floor is broken by a few dozen small crater pits, those in clusters are probably secondaries. Smooth material also fills the floors of many nearby craters. As near Pitiscus this smooth material looks like mare lava, but lacks the dark color at high sun that is caused by the iron and magnesium in mare basalts. The prevailing theory is that light smooth plains are fluidized ejecta widely dispersed by the formation of the Orientale basin. The problem with this explanation is that counts of craters on Schiller’s smooth floor implies that that material is 100 million years younger than the Orientale formation. Another possibility is that the smooth material is normal basalt, veneered with bright dust from later impacts. Such cryptomaria exist nearby, but small craters in Schiller don’t have dark haloes from underlying basalt, so that explanation doesn’t work either. As I said yesterday, some - maybe all - light-hued smooth plains may be an unsampled type of volcanism, but so far there is no proof.

— Chuck Wood

Technical Details:
18" Starmaster Newtonian Reflector + DMK-21F04 Firewire Camera, 30FPS

Related Links:
Wes' Web Site

Yesterday's LPOD: Can You Names These Craters?

Tomorrow's LPOD: New Lunar Maps!


Author & Editor:
Charles A. Wood

 

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