Revision as of 14:40, 4 January 2015

Frigid Buddies: Aristoteles and Eudoxus

June 18, 2004

Frigid Buddies: Aristoteles and Eudoxus

Aristoteles and Eudoxus are two of the largest young craters in the north polar region of the Moon. Aristoteles is 87 km wide and Eudoxus has a diameter of 67 km. These craters look pretty similar, both have terraced walls and hilly floors, apparently veneered with some smooth material - perhaps impact melt. Which is youngest? The larger crater has radial ejecta and secondary craters on nearby Mare Frigoris. These are seen more clearly on the Lunar Orbiter IV frame. Because Eudoxus formed on rubbly Imbrium ejecta, its secondary craters are harder to recognize. The US Geological Survey assigns Eudoxus a stratigraphic age of Copernican, whereas Aristoteles is Eratosthenian. This means that Eudoxus is younger than 1.1 billion years old, and Aristoteles is somewhere between 1.1 and 3.2 b.y. old. Since both craters have about the same number of superposed (subsequent) impact craters, the two craters must be very near the Copernican-Eratosthenian boundary, with one slightly older and the other slightly younger.

Technical Details:
Cristian's low Sun view was obtained May 25, 2004 when the seeing was excellent. He used a 25 cm Newtonian telescope with a Vesta Pro webcam; 300 out of 450 frames were combined with the IRIS software.

Tomorrow's LPOD: Janssen

Author & Editor:
Charles A. Wood

Technical Consultant:
Anthony Ayiomamitis

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 __NOTOC__
 =Frigid Buddies: Aristoteles and Eudoxus=
+      </p>
+ <table width="640"  border="0" align="center" cellpadding="6" cellspacing="2">
+    <tr>
+      <td><h2 align="left">Frigid Buddies: Aristoteles and Eudoxus</h2></td>
+      <td><h2 align="right">June 18, 2004</h2></td>
+    </tr></table>
+<table width="90%" border="0" align="center" cellpadding="6" cellspacing="2">
+    <tr>
+      <td colspan="2"><div align="center">
+	  <IMG SRC="images/LPOD-2004-06-18.jpeg" NAME="main_image" width="589" height="426" border="0"></div></td>
+    </tr>
+</table>
+<table width="100%"  border="0" cellpadding="8">
+    <tr>
+      <td><div align="center"><span class="main_sm">Image Credit: [mailto:fattinnanzi.c@tiscali.it Cristian Fattinnanzi]</span></div></td>
+    </tr>
+  </table>
+ </p>
+  <table class="story" border="0" bgcolor="#FFFFFF" width="90%" cellpadding="10" align="center"><tr><td>
+  <p class="story" align="center"><b>Frigid Buddies: Aristoteles and Eudoxus</b></p>
+  <p class="story" align="left">Aristoteles and Eudoxus are two of the largest young craters in the north polar region of the Moon. Aristoteles is 87 km wide and Eudoxus has a diameter of 67 km. These craters look pretty similar, both have terraced walls and hilly floors, apparently veneered with some smooth material - perhaps impact melt. Which is youngest? The larger crater has radial ejecta and secondary craters on nearby Mare Frigoris. These are seen more clearly on the Lunar Orbiter IV frame. Because Eudoxus formed on rubbly Imbrium ejecta, its secondary craters are harder to recognize. The US Geological Survey assigns Eudoxus a stratigraphic [http://www.lpod.org/LPOD-2004-02-23.htm age]  of Copernican, whereas Aristoteles is Eratosthenian. This means that Eudoxus is younger than 1.1 billion years old, and Aristoteles is somewhere between 1.1 and 3.2 b.y. old. Since both craters have about the same number of superposed (subsequent) impact craters, the two craters must be very near the Copernican-Eratosthenian boundary, with one slightly older and the other slightly younger.</p>
+  <p><b>Technical Details:</b><br>
+    Cristian's low Sun view was obtained May 25, 2004 when the seeing was excellent. He used a 25 cm Newtonian telescope with a Vesta Pro webcam; 300 out of 450 frames were combined with the IRIS software.</p>
+  <p class"story"><b>Related Links:</b><br>
+  [http://www.lpi.usra.edu/research/lunar_orbiter/images/img/iv_098_h3.jpg  Aristoteles:  Lunar Orbiter IV View]<br>
+  [http://www.lpi.usra.edu/research/lunar_orbiter/images/img/iv_098_h2.jpg Eudoxus: Lunar Orbiter IV View ]
+  </p>
+  <p class"story"> <b>Tomorrow's LPOD:</b> Janssen</p>
+   <p><img src="../../../MainPage/spacer.gif" width="640" height="1"></p></td></tr>
+</table>
+</td>
+  </tr>
+<tr>
+  <td colspan="2" rowspan="1">
+  <!-- start bottom -->
+  <table width="100%"  border="0" cellspacing="2" cellpadding="4">
+    <tr>
+      <td><hr width="640"></td>
+      </tr>
+    <tr>
+      <td><p align="center" class="main_titles"><b>Author & Editor:</b><br>
+          [mailto:chuck@observingthesky.org Charles A. Wood]</p>
+        <p align="center" class="main_titles"><b>Technical Consultant:</b><br>
+            [mailto:anthony@perseus.gr Anthony Ayiomamitis]</p>
+        <p align="center" class="main_titles"><b>[mailto:webmaster@entropysponge.com Contact Webmaster]</b></p>
+        <p align="center" class="main_titles"><b>A service of:</b><br>
+            <a class="one" href="http://www.observingthesky.org/">ObservingTheSky.Org</a></p>
+	   </td>
+      </tr>
+  </table>
+  <!-- end cal -->
+  <div align="center"><br>
+      <span class="main_titles"><b>Visit these other PODs:</b> <br>
+  <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></span></div></td>
+  </table>
+<p>&nbsp;</p>

Difference between revisions of "June 18, 2004"

Revision as of 14:40, 4 January 2015

Frigid Buddies: Aristoteles and Eudoxus