Difference between revisions of "March 23, 2005"
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<p align="left">Craters we don't look at carefully sometimes hold secrets! Here is an excellent image of the floor-fractured crater Doppelmayer on the southern shore of Mare Humorum. Like Gassendi, this 64 km crater was tilted by the subsidence of Mare Humorum, in this case so much that the northeastern rim was submerged under mare lavas. Doppelmayer has a single massive peak that looks like it may rise higher than the remaining rim crests. A crater pit occurs near of the summit of the peak - presumably a chance impact. The most interesting feature inside the crater is it broad wreath of hilly ridges that are concentric with the crater rim. This wreath is also flooded by Humorum lavas, demonstrating that the floor uplift that modified Doppelmayer occurred before the last stage of mare flooding. A surprising find is an apparent lunar dome immediately south of Doppelmayer's rim, just west of the crater Lee. Mike's low Sun image shows a bright east side and a delicate shading on the west side of the putative dome. On the summit is a large and elongated central pit, and two smaller craterlets occur on the sides. This feature does not appear on the GLR Dome Map. Finally, note that the wreath and crater floor between Doppelmayer'sentral peak and Mare Humorum is dark - dark pyroclastic deposits have been mapped to the north of the crater, but this may be another new surprise. | <p align="left">Craters we don't look at carefully sometimes hold secrets! Here is an excellent image of the floor-fractured crater Doppelmayer on the southern shore of Mare Humorum. Like Gassendi, this 64 km crater was tilted by the subsidence of Mare Humorum, in this case so much that the northeastern rim was submerged under mare lavas. Doppelmayer has a single massive peak that looks like it may rise higher than the remaining rim crests. A crater pit occurs near of the summit of the peak - presumably a chance impact. The most interesting feature inside the crater is it broad wreath of hilly ridges that are concentric with the crater rim. This wreath is also flooded by Humorum lavas, demonstrating that the floor uplift that modified Doppelmayer occurred before the last stage of mare flooding. A surprising find is an apparent lunar dome immediately south of Doppelmayer's rim, just west of the crater Lee. Mike's low Sun image shows a bright east side and a delicate shading on the west side of the putative dome. On the summit is a large and elongated central pit, and two smaller craterlets occur on the sides. This feature does not appear on the GLR Dome Map. Finally, note that the wreath and crater floor between Doppelmayer'sentral peak and Mare Humorum is dark - dark pyroclastic deposits have been mapped to the north of the crater, but this may be another new surprise. | ||
</p> | </p> | ||
| − | <blockquote><p align="right">— [mailto:tychocrater@yahoo.com Chuck Wood]</blockquote> | + | <blockquote> |
| − | <p align="left" | + | <p align="right">— [mailto:tychocrater@yahoo.com Chuck Wood]</blockquote> |
| + | <p align="left"><b>Technical Details:</b><br> | ||
MAr 21, 2005. 18" Starmaster + 5X's powermate + a Baader 685nm IR passband filter</p> | MAr 21, 2005. 18" Starmaster + 5X's powermate + a Baader 685nm IR passband filter</p> | ||
<p><b>Related Links:</b><br> | <p><b>Related Links:</b><br> | ||
Revision as of 17:19, 17 January 2015
Doppelmayer Surprises
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Image Credit: Mike Wirths
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Doppelmayer Surprises Craters we don't look at carefully sometimes hold secrets! Here is an excellent image of the floor-fractured crater Doppelmayer on the southern shore of Mare Humorum. Like Gassendi, this 64 km crater was tilted by the subsidence of Mare Humorum, in this case so much that the northeastern rim was submerged under mare lavas. Doppelmayer has a single massive peak that looks like it may rise higher than the remaining rim crests. A crater pit occurs near of the summit of the peak - presumably a chance impact. The most interesting feature inside the crater is it broad wreath of hilly ridges that are concentric with the crater rim. This wreath is also flooded by Humorum lavas, demonstrating that the floor uplift that modified Doppelmayer occurred before the last stage of mare flooding. A surprising find is an apparent lunar dome immediately south of Doppelmayer's rim, just west of the crater Lee. Mike's low Sun image shows a bright east side and a delicate shading on the west side of the putative dome. On the summit is a large and elongated central pit, and two smaller craterlets occur on the sides. This feature does not appear on the GLR Dome Map. Finally, note that the wreath and crater floor between Doppelmayer'sentral peak and Mare Humorum is dark - dark pyroclastic deposits have been mapped to the north of the crater, but this may be another new surprise. Technical Details: Related Links: Tomorrow's LPOD: Another Surprise! |
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