Difference between revisions of "February 17, 2005"
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onMouseOver = "document.images['main_image'].src='archive/2005/02/images/LPOD-2005-02-17b.jpeg'; return true" | onMouseOver = "document.images['main_image'].src='archive/2005/02/images/LPOD-2005-02-17b.jpeg'; return true" | ||
onMouseOut = "document.images['main_image'].src='archive/2005/02/images/LPOD-2005-02-17.jpeg'; return false" | onMouseOut = "document.images['main_image'].src='archive/2005/02/images/LPOD-2005-02-17.jpeg'; return false" | ||
− | + | [[File:LPOD-2005-02-17.jpeg|LPOD-2005-02-17.jpeg]]] | |
</div></td> | </div></td> | ||
</tr> | </tr> | ||
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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 align="center"><b>Keeping Up With The Smythiis</b></p> | <p align="center"><b>Keeping Up With The Smythiis</b></p> | ||
− | <p align="left">The equatorial eastern limb of the Moon is more interesting than much of the terrain immediately nearer the Earthside. The reason is twofold: (1) the area between Crisium and Fecunditatis and the limb is boring because it lacks any distinctive large fresh craters, and instead is a mishmash of older, look-alike craters flooded with and surrounded by mare material; and (2) the limb is home to two maria – [ | + | <p align="left">The equatorial eastern limb of the Moon is more interesting than much of the terrain immediately nearer the Earthside. The reason is twofold: (1) the area between Crisium and Fecunditatis and the limb is boring because it lacks any distinctive large fresh craters, and instead is a mishmash of older, look-alike craters flooded with and surrounded by mare material; and (2) the limb is home to two maria – [[October_9,_2004| Marginis ]] and Smythii – that occupy two impact basins. Of the two, Smythii offers more vestiges of its basin structure – principally its well-defined, curved rim. When the sunset terminator is just east of Smythii you can observe the shadow cast by the rim and appreciate that the mare is substantially lower than the rim. In fact, Clementine altimeter readings show that the rim rises an amazing 6-8 km above the mare. The circular outline of the rim is clearly demonstrated in Mario’s rectified view (mouseover) of Smythii made using PlanetWarp. Also clear is the two different shades of mare lavas. Crater counts imply that the darker Smythii lavas may be among the youngest on the Moon, perhaps 1.5 b.y. old.</p> |
<blockquote><p align="right">— [mailto:tychocrater@yahoo.com Chuck Wood]</blockquote> | <blockquote><p align="right">— [mailto:tychocrater@yahoo.com Chuck Wood]</blockquote> | ||
<p align="left"><p><b>Technical Details:</b><br> | <p align="left"><p><b>Technical Details:</b><br> | ||
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[mailto:anthony@perseus.gr Anthony Ayiomamitis]</p> | [mailto:anthony@perseus.gr Anthony Ayiomamitis]</p> | ||
<p align="center" class="main_titles"><b>Contact Translator:</b><br> | <p align="center" class="main_titles"><b>Contact Translator:</b><br> | ||
− | [mailto:pablolonnie@yahoo.com.mx | + | [mailto:pablolonnie@yahoo.com.mx Pablo Lonnie Pacheco Railey] (Es)<br> |
− | [mailto:chlegrand@free.fr | + | [mailto:chlegrand@free.fr Christian Legrand] (Fr)</p> |
<p align="center" class="main_titles"><b>[mailto:webuser@observingthesky.org Contact Webmaster]</b></p> | <p align="center" class="main_titles"><b>[mailto:webuser@observingthesky.org Contact Webmaster]</b></p> | ||
<p align="center" class="main_titles"><b>A service of:</b><br> | <p align="center" class="main_titles"><b>A service of:</b><br> | ||
− | [http://www.observingthesky.org/ | + | [http://www.observingthesky.org/ ObservingTheSky.Org]</p> |
<p align="center" class="main_titles"><b>Visit these other PODs:</b> <br> | <p align="center" class="main_titles"><b>Visit these other PODs:</b> <br> | ||
− | [http://antwrp.gsfc.nasa.gov/apod/astropix.html | + | [http://antwrp.gsfc.nasa.gov/apod/astropix.html Astronomy] | [http://www.msss.com/ Mars] | [http://epod.usra.edu/ Earth]</p> |
</td></tr> | </td></tr> | ||
</table> | </table> |
Revision as of 15:29, 17 January 2015
Keeping Up With The Smythiis
<nobr>Keeping Up With The Smythiis</nobr> |
Image Credit: Mario Santiago
|
Keeping Up With The Smythiis The equatorial eastern limb of the Moon is more interesting than much of the terrain immediately nearer the Earthside. The reason is twofold: (1) the area between Crisium and Fecunditatis and the limb is boring because it lacks any distinctive large fresh craters, and instead is a mishmash of older, look-alike craters flooded with and surrounded by mare material; and (2) the limb is home to two maria – Marginis and Smythii – that occupy two impact basins. Of the two, Smythii offers more vestiges of its basin structure – principally its well-defined, curved rim. When the sunset terminator is just east of Smythii you can observe the shadow cast by the rim and appreciate that the mare is substantially lower than the rim. In fact, Clementine altimeter readings show that the rim rises an amazing 6-8 km above the mare. The circular outline of the rim is clearly demonstrated in Mario’s rectified view (mouseover) of Smythii made using PlanetWarp. Also clear is the two different shades of mare lavas. Crater counts imply that the darker Smythii lavas may be among the youngest on the Moon, perhaps 1.5 b.y. old. Technical Details: Related Links: Tomorrow's LPOD: Memory of a Crater |
Author & Editor: Technical Consultant: Contact Translator: A service of: |
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