Difference between revisions of "October 24, 2004"

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=A Long, Cold Mare=
 
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<td width="50%"><h2><nobr>A Long, Cold Mare</nobr></h2></td>
 
 
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<tr><td><div align="center" class="main_sm">Image Credit: [mailto:kcpaulhk@yahoo.com.hk KC Pau]</p>
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<tr><td><div align="center" class="main_sm"><p>Image Credit: [mailto:kcpaulhk@yahoo.com.hk KC Pau]</p>
 
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<p align="center"><b>A Long, Cold Mare</b></p>
 
<p align="center"><b>A Long, Cold Mare</b></p>
<p align="left">Maria seem to come in all shapes and [http://cwm.lpod.org/DataStuff/MareAreas.htm  sizes] - from the large, near circular Mare Imbrium to the small Mare Anguis (which I always think of as anguishing over its impudence in being a mare rather than a lacus). But the strangest mare of all is Frigoris, which stretches about 1600 km from east to west, but only 200 or so km from north to south. Frigoris clearly does not fill a circular impact basin, and the best that can be said is that its mare lavas occupy a concentric depression around Imbrium, just as do Mare Vaporum and Sinus Aestuum. The Frigoris lavas seem to be of somewhat diverse ages and compositions. KC's image illustrates that large parts of the mare are lighter than other parts, partially because it is crossed by some bright [http://www.lpod.org/archive/2004/05/LPOD-2004-05-14.htm rays]. But part of the light hue is due to a difference in composition - the Galileo multi-spectral [http://www.lpod.org/archive/2004/05/LPOD-2004-05-10.htm image] shows that most of Frigoris is gold-hued, but the western part is blue. And gold = titanium-poor, and blue = intermediate titanium lavas. Crater counts indicate that most Imbrium lavas are Imbrium in age, but the darker patches north of Plato and the broad region around Harpalus are [http://www.lpod.org/archive/2004/02/LPOD-2004-02-23.htm Eratosthenian].
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<p align="left">Maria seem to come in all shapes and [http://cwm.lpod.org/DataStuff/MareAreas.htm  sizes] - from the large, near circular Mare Imbrium to the small Mare Anguis (which I always think of as anguishing over its impudence in being a mare rather than a lacus). But the strangest mare of all is Frigoris, which stretches about 1600 km from east to west, but only 200 or so km from north to south. Frigoris clearly does not fill a circular impact basin, and the best that can be said is that its mare lavas occupy a concentric depression around Imbrium, just as do Mare Vaporum and Sinus Aestuum. The Frigoris lavas seem to be of somewhat diverse ages and compositions. KC's image illustrates that large parts of the mare are lighter than other parts, partially because it is crossed by some bright [[May_14,_2004|rays]]. But part of the light hue is due to a difference in composition - the Galileo multi-spectral [[May_10,_2004|image]] shows that most of Frigoris is gold-hued, but the western part is blue. And gold = titanium-poor, and blue = intermediate titanium lavas. Crater counts indicate that most Imbrium lavas are Imbrium in age, but the darker patches north of Plato and the broad region around Harpalus are [[February_23,_2004|Eratosthenian]].
 
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<blockquote><p align="right">&#8212; [mailto:tychocrater@yahoo.com Chuck Wood]</blockquote>
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<blockquote>
<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>
 
September 26, 2004, a mosaic of 4 images using a 10" Newtonian and a webcam. CAW has enhanced the image using the Photoshop unsharp mask filter.</p>
 
September 26, 2004, a mosaic of 4 images using a 10" Newtonian and a webcam. CAW has enhanced the image using the Photoshop unsharp mask filter.</p>
 
<p><b>Related Links:</b><br>
 
<p><b>Related Links:</b><br>
 
[http://www.lpi.usra.edu/meetings/lpsc2003/pdf/1257.pdf Ages of Mare Basalts...]
 
[http://www.lpi.usra.edu/meetings/lpsc2003/pdf/1257.pdf Ages of Mare Basalts...]
 
<br>Rukl <i>Atlas of the Moon,</i> Sheets 2, 3 & 4
 
<br>Rukl <i>Atlas of the Moon,</i> Sheets 2, 3 & 4
<p align="left"><b>Tomorrow's LPOD: </b> Modeling Domes</p>
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</p>
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<p><b>Yesterday's LPOD:</b> [[October 23, 2004|Imaging the First Lunar Photographer]] </p>
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<p><b>Tomorrow's LPOD:</b> [[October 25, 2004|Modeling Domes]] </p>
 
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<p align="center" class="main_titles"><b>Author &amp; Editor:</b><br>  
 
<p align="center" class="main_titles"><b>Author &amp; Editor:</b><br>  
 
[mailto:tychocrater@yahoo.com Charles A. Wood]</p>
 
[mailto:tychocrater@yahoo.com Charles A. Wood]</p>
<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>Contact Translator:</b><br>
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[mailto:pablolonnie@yahoo.com.mx Pablo Lonnie Pacheco Railey]  (Es)<br>
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[mailto:chlegrand@free.fr 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/ ObservingTheSky.Org]</p>
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<!-- Cleanup of credits -->
<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 Astronomy] | [http://www.msss.com/ Mars] | [http://epod.usra.edu/ Earth]</p>
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Latest revision as of 15:01, 15 March 2015

A Long, Cold Mare


LPOD-2004-10-24.jpeg

LPOD-2004-10-24b.jpeg

Image Credit: KC Pau


A Long, Cold Mare

Maria seem to come in all shapes and sizes - from the large, near circular Mare Imbrium to the small Mare Anguis (which I always think of as anguishing over its impudence in being a mare rather than a lacus). But the strangest mare of all is Frigoris, which stretches about 1600 km from east to west, but only 200 or so km from north to south. Frigoris clearly does not fill a circular impact basin, and the best that can be said is that its mare lavas occupy a concentric depression around Imbrium, just as do Mare Vaporum and Sinus Aestuum. The Frigoris lavas seem to be of somewhat diverse ages and compositions. KC's image illustrates that large parts of the mare are lighter than other parts, partially because it is crossed by some bright rays. But part of the light hue is due to a difference in composition - the Galileo multi-spectral image shows that most of Frigoris is gold-hued, but the western part is blue. And gold = titanium-poor, and blue = intermediate titanium lavas. Crater counts indicate that most Imbrium lavas are Imbrium in age, but the darker patches north of Plato and the broad region around Harpalus are Eratosthenian.

Chuck Wood

Technical Details:
September 26, 2004, a mosaic of 4 images using a 10" Newtonian and a webcam. CAW has enhanced the image using the Photoshop unsharp mask filter.

Related Links:
Ages of Mare Basalts...
Rukl Atlas of the Moon, Sheets 2, 3 & 4

Yesterday's LPOD: Imaging the First Lunar Photographer

Tomorrow's LPOD: Modeling Domes



Author & Editor:
Charles A. Wood

 


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