Difference between revisions of "April 30, 2009"
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=A Little Bit About a Normal Crater= | =A Little Bit About a Normal Crater= | ||
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| − | <em>image by [mailto:dpeach_78@yahoo.co.uk Damian Peach]</em><br /> | + | <em>image by [mailto:dpeach_78@yahoo.co.uk" rel="nofollow Damian Peach]</em><br /> |
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When I first saw this picture I didn't recognize the crater - and I bet you don't either. But it is right in plain view near the middle of the Moon as we see it. And until today it hasn't been an LPOD. The crater is Horrocks, 30 km wide and 3 km deep, within the large crater [http://lpod.wikispaces.com/April+24,+2009 Hipparchus]. Horrocks doesn't have rays any more, and its interior wall is a little rounded. It formed after the Imbrium Basin, but it has been around long enough to be somewhat weathered. Horrocks is a complex crater, meaning that its initial walls collapsed, sliding toward the floor, and leaving a steep scarp near the rim crest. There is only a small flat piece of the floor, the rest being covered with debris from the walls that cover all but a tiny bit of the central peaks that must be there. Two further things need noting. A scallop takes a bite out of the east rim. This is a place, as on the west rim of Plato, where a large rim collapse ate back beyond the original rim. A second rim segment is visible just to the west of Horrocks - this is all that remains of a pre-existing crater that was smashed by the formation of Horrocks.<br /> | When I first saw this picture I didn't recognize the crater - and I bet you don't either. But it is right in plain view near the middle of the Moon as we see it. And until today it hasn't been an LPOD. The crater is Horrocks, 30 km wide and 3 km deep, within the large crater [http://lpod.wikispaces.com/April+24,+2009 Hipparchus]. Horrocks doesn't have rays any more, and its interior wall is a little rounded. It formed after the Imbrium Basin, but it has been around long enough to be somewhat weathered. Horrocks is a complex crater, meaning that its initial walls collapsed, sliding toward the floor, and leaving a steep scarp near the rim crest. There is only a small flat piece of the floor, the rest being covered with debris from the walls that cover all but a tiny bit of the central peaks that must be there. Two further things need noting. A scallop takes a bite out of the east rim. This is a place, as on the west rim of Plato, where a large rim collapse ate back beyond the original rim. A second rim segment is visible just to the west of Horrocks - this is all that remains of a pre-existing crater that was smashed by the formation of Horrocks.<br /> | ||
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| − | <em>[mailto:tychocrater@yahoo.com Chuck Wood]</em><br /> | + | <em>[mailto:tychocrater@yahoo.com" rel="nofollow Chuck Wood]</em><br /> |
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<strong>Technical Details</strong><br /> | <strong>Technical Details</strong><br /> | ||
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<strong>Related Links</strong><br /> | <strong>Related Links</strong><br /> | ||
Rükl plate [http://the-moon.wikispaces.com/Rukl+45 45]<br /> | Rükl plate [http://the-moon.wikispaces.com/Rukl+45 45]<br /> | ||
| − | Damian's [http://www.damianpeach.com/ website]<br /> | + | Damian's [http://www.damianpeach.com/" rel="nofollow website]<br /> |
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Revision as of 19:07, 4 January 2015
A Little Bit About a Normal Crater
image by " rel="nofollow Damian Peach
When I first saw this picture I didn't recognize the crater - and I bet you don't either. But it is right in plain view near the middle of the Moon as we see it. And until today it hasn't been an LPOD. The crater is Horrocks, 30 km wide and 3 km deep, within the large crater Hipparchus. Horrocks doesn't have rays any more, and its interior wall is a little rounded. It formed after the Imbrium Basin, but it has been around long enough to be somewhat weathered. Horrocks is a complex crater, meaning that its initial walls collapsed, sliding toward the floor, and leaving a steep scarp near the rim crest. There is only a small flat piece of the floor, the rest being covered with debris from the walls that cover all but a tiny bit of the central peaks that must be there. Two further things need noting. A scallop takes a bite out of the east rim. This is a place, as on the west rim of Plato, where a large rim collapse ate back beyond the original rim. A second rim segment is visible just to the west of Horrocks - this is all that remains of a pre-existing crater that was smashed by the formation of Horrocks.
" rel="nofollow Chuck Wood
Technical Details
May 25, 2008. 14" telescope.
Related Links
Rükl plate 45
Damian's " rel="nofollow website
