Difference between revisions of "May 16, 2005"

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    <tr><td><div align="center" class="main_sm">Image Credit: [mailto:kcpaulhk@yahoo.com.hk K.C. Pau]</p>
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<tr><td><div align="center" class="main_sm"><p>Image Credit: [mailto:kcpaulhk@yahoo.com.hk K.C. Pau]</p>
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<p align="center"><b>Procellarum Twins</b></p>
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<p align="center"><b>Procellarum Twins</b></p>
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<p align="left">Western Oceanus Procellarum has few attractions because the relatively bland lava surface extends almost to the limb. But two nearly twin craters about 15 degrees north of the equator offer a number of observing challenges. Cardanus and Krafft are each about 50 km in diameter and each appears relatively fresh. But K.C.’s near-terminator image shows that they have different relations with the adjacent Oceanus Procellarum. We can see that Krafft, the northernmost (left) twin, is older than the surrounding mare because the crater’s radial ejecta and rim deposits are covered by the lavas. Look further north and notice that Seleucus and Briggs are also surrounded by younger lava. Cardanus has a more complex relation. It has formed on an older and higher piece of lava, and its beautiful radial ejecta ridges are still preserved on that lava surface. A number of rilles also cross this old surface. However, on the left side of Cardanus, the older mare is abruptly truncated and smooth younger lava flowed right up to the crater rim. In fact, the area immediately northeast of Cardanus looks like there is another 50 km wide crater that has been completely buried by the younger lavas. Do you see it - it butts up against the odd crater chain (Catena Krafft) that links the twins? And also notice the contact between the older and younger lavas is quite distinct east of Cardanus where the surface texture and rilles abruptly stop.</p>
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<p align="left">Western Oceanus Procellarum has few attractions because the relatively bland lava surface extends almost to the limb. But two nearly twin craters about 15 degrees north of the equator offer a number of observing challenges. Cardanus and Krafft are each about 50 km in diameter and each appears relatively fresh. But K.C.’s near-terminator image shows that they have different relations with the adjacent Oceanus Procellarum. We can see that Krafft, the northernmost (left) twin, is older than the surrounding mare because the crater’s radial ejecta and rim deposits are covered by the lavas. Look further north and notice that Seleucus and Briggs are also surrounded by younger lava. Cardanus has a more complex relation. It has formed on an older and higher piece of lava, and its beautiful radial ejecta ridges are still preserved on that lava surface. A number of rilles also cross this old surface. However, on the left side of Cardanus, the older mare is abruptly truncated and smooth younger lava flowed right up to the crater rim. In fact, the area immediately northeast of Cardanus looks like there is another 50 km wide crater that has been completely buried by the younger lavas. Do you see it - it butts up against the odd crater chain (Catena Krafft) that links the twins? And also notice the contact between the older and younger lavas is quite distinct east of Cardanus where the surface texture and rilles abruptly stop.</p>
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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>
 
April 22, 2005. 10" f/6 Newtonian + 5X barlow + Philips Toucam Pro.
 
April 22, 2005. 10" f/6 Newtonian + 5X barlow + Philips Toucam Pro.
 
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Rukl Plates 17 & 28
 
Rukl Plates 17 & 28
 
<br>[http://www.lpi.usra.edu/resources/lunar_orbiter/im Lunar Orbiter IV View http://www.lpi.usra.edu/resources/lunar_orbiter/images/img/iv_169_h2.jpg]
 
<br>[http://www.lpi.usra.edu/resources/lunar_orbiter/im Lunar Orbiter IV View http://www.lpi.usra.edu/resources/lunar_orbiter/images/img/iv_169_h2.jpg]
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<p align="left"><b>Tomorrow's LPOD: </b> Against All Odds</p>
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<p><b>Yesterday's LPOD:</b> [[May 14, 2005|Ancient Island]] </p>
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<p><b>Tomorrow's LPOD:</b> [[May 17, 2005|Against All Odds]] </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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<p align="center" class="main_titles"><b>Contact Translator:</b><br>
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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 15:15, 15 March 2015

Procellarum Twins


LPOD-2005-05-16.jpeg

LPOD-2005-05-16b.jpeg

Image Credit: K.C. Pau


Procellarum Twins

Western Oceanus Procellarum has few attractions because the relatively bland lava surface extends almost to the limb. But two nearly twin craters about 15 degrees north of the equator offer a number of observing challenges. Cardanus and Krafft are each about 50 km in diameter and each appears relatively fresh. But K.C.’s near-terminator image shows that they have different relations with the adjacent Oceanus Procellarum. We can see that Krafft, the northernmost (left) twin, is older than the surrounding mare because the crater’s radial ejecta and rim deposits are covered by the lavas. Look further north and notice that Seleucus and Briggs are also surrounded by younger lava. Cardanus has a more complex relation. It has formed on an older and higher piece of lava, and its beautiful radial ejecta ridges are still preserved on that lava surface. A number of rilles also cross this old surface. However, on the left side of Cardanus, the older mare is abruptly truncated and smooth younger lava flowed right up to the crater rim. In fact, the area immediately northeast of Cardanus looks like there is another 50 km wide crater that has been completely buried by the younger lavas. Do you see it - it butts up against the odd crater chain (Catena Krafft) that links the twins? And also notice the contact between the older and younger lavas is quite distinct east of Cardanus where the surface texture and rilles abruptly stop.

— Chuck Wood

Technical Details:
April 22, 2005. 10" f/6 Newtonian + 5X barlow + Philips Toucam Pro.
Our electricity was off for most of the last 20 hours so I was unable to post an LPOD for May 15. Sorry! And another thunderstorm is almost here so I have to hurry!

Related Links:
Rukl Plates 17 & 28
Lunar Orbiter IV View http://www.lpi.usra.edu/resources/lunar_orbiter/images/img/iv_169_h2.jpg

Yesterday's LPOD: Ancient Island

Tomorrow's LPOD: Against All Odds


Author & Editor:
Charles A. Wood

 

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