Difference between revisions of "De Morgan"
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'''Left:''' ''[http://lpod.org/coppermine/displayimage.php?pos=-2646 Clementine]'' Under high Sun, '''de Morgan''' is lost (the small unbright crater in the middle of the frame) amid the dark rays of [[Dionysius|Dionysius]] and the crisp bright walled [[Cayley|Cayley]], immediately above '''de Morgan'''. '''Middle''': ''[http://lpod.org/coppermine/displayimage.php?pos=-2647 Clementine closeup]'' '''Right:''' ''[http://www.lpi.usra.edu/resources/lunarorbiter/images/preview/4090_h1.jpg Lunar Orbiter LO-4090-H1]'' image from the [http://www.lpi.usra.edu/ Lunar & Planetary Institute].<br /> <br /> <div id="toc"> | '''Left:''' ''[http://lpod.org/coppermine/displayimage.php?pos=-2646 Clementine]'' Under high Sun, '''de Morgan''' is lost (the small unbright crater in the middle of the frame) amid the dark rays of [[Dionysius|Dionysius]] and the crisp bright walled [[Cayley|Cayley]], immediately above '''de Morgan'''. '''Middle''': ''[http://lpod.org/coppermine/displayimage.php?pos=-2647 Clementine closeup]'' '''Right:''' ''[http://www.lpi.usra.edu/resources/lunarorbiter/images/preview/4090_h1.jpg Lunar Orbiter LO-4090-H1]'' image from the [http://www.lpi.usra.edu/ Lunar & Planetary Institute].<br /> <br /> <div id="toc"> | ||
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==Images== | ==Images== | ||
[http://www.lpod.org/coppermine/thumbnails.php?album=search&type=full&search=De%20Morgan LPOD Photo Gallery] [http://www.lpi.usra.edu/resources/lunar_orbiter/bin/srch_nam.shtml?De%20Morgan%7C0 Lunar Orbiter Images] [http://www.lpi.usra.edu/resources/apollo/search/feature/?feature=De%20Morgan Apollo Images]<br /> | [http://www.lpod.org/coppermine/thumbnails.php?album=search&type=full&search=De%20Morgan LPOD Photo Gallery] [http://www.lpi.usra.edu/resources/lunar_orbiter/bin/srch_nam.shtml?De%20Morgan%7C0 Lunar Orbiter Images] [http://www.lpi.usra.edu/resources/apollo/search/feature/?feature=De%20Morgan Apollo Images]<br /> | ||
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''([[LAC%20zone|LAC zone]] 60D4)'' [http://www.lpi.usra.edu/resources/mapcatalog/LAC/lac60/ LAC map] [http://www.lpi.usra.edu/resources/mapcatalog/usgs/I510/ Geologic map] [http://www.lpi.usra.edu/resources/mapcatalog/LM/lm60/ LM map] [http://www.lpi.usra.edu/resources/mapcatalog/AIC/AIC60D/ AIC map]<br /> <br /> | ''([[LAC%20zone|LAC zone]] 60D4)'' [http://www.lpi.usra.edu/resources/mapcatalog/LAC/lac60/ LAC map] [http://www.lpi.usra.edu/resources/mapcatalog/usgs/I510/ Geologic map] [http://www.lpi.usra.edu/resources/mapcatalog/LM/lm60/ LM map] [http://www.lpi.usra.edu/resources/mapcatalog/AIC/AIC60D/ AIC map]<br /> <br /> | ||
==Description== | ==Description== | ||
| − | [[Clementine|Clementine]] provides an excellent view of this standard little simple crater. It has steep walls and a flat floor with two tiny hills as central peaks. '''de Morgan''''s walls are not nearly as bright as those of nearby [[Cayley|Cayley]], suggesting that the smaller crater is older. This is supported by noting that [[Cayley|Cayley]] truncates one of the dark rays from [[Dionysius|Dionysius]], whereas a piece of the dark ejecta seems to impinge on the western wall of '''de Morgan'''. But two other dark areas occur along the northern wall so perhaps this is just a buried pyroclastic layer - the same one that is the source of [[Dionysius|Dionysius]]' rays. <span class="membersnap">- | + | [[Clementine|Clementine]] provides an excellent view of this standard little simple crater. It has steep walls and a flat floor with two tiny hills as central peaks. '''de Morgan''''s walls are not nearly as bright as those of nearby [[Cayley|Cayley]], suggesting that the smaller crater is older. This is supported by noting that [[Cayley|Cayley]] truncates one of the dark rays from [[Dionysius|Dionysius]], whereas a piece of the dark ejecta seems to impinge on the western wall of '''de Morgan'''. But two other dark areas occur along the northern wall so perhaps this is just a buried pyroclastic layer - the same one that is the source of [[Dionysius|Dionysius]]' rays. <span class="membersnap">- tychocrater <small>Sep 26, 2007</small></span><br /> <br /> |
===Elger=== | ===Elger=== | ||
''([[IAU%20Directions|IAU Directions]])'' DE MORGAN.--A brilliant little crater, 4 miles in diameter, on the plain S. of the [[Ariadaeus|Ariadaeus]] cleft.<br /> <br /> | ''([[IAU%20Directions|IAU Directions]])'' DE MORGAN.--A brilliant little crater, 4 miles in diameter, on the plain S. of the [[Ariadaeus|Ariadaeus]] cleft.<br /> <br /> | ||
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[[Alphabetical%20Index|Named Features]] -- Prev: [[De%20Moraes|De Moraes]] -- Next: [[De%20Roy|De Roy]]<br /> | [[Alphabetical%20Index|Named Features]] -- Prev: [[De%20Moraes|De Moraes]] -- Next: [[De%20Roy|De Roy]]<br /> | ||
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Revision as of 16:19, 15 April 2018
Contents
De Morgan
Lat: 3.3°N, Long: 14.9°E, Diam: 10 km, Depth: 1.9 km, Rükl: 34
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Images
LPOD Photo Gallery Lunar Orbiter Images Apollo Images
- Although there's nothing in the LPI's search list for orbital Apollo photographs of De Morgan and nearby craters Cayley, D'Arrest, and Whewell, these craters were captured on several frames of Apollo 16's north-looking metric/mapping Fairchild camera, such as frame AS16-M-0831. In this frame, De Morgan and its surrounding craters are visible near the central part of the curved horizon.
- Research: Danny Caes.
Maps
(LAC zone 60D4) LAC map Geologic map LM map AIC map
Description
Clementine provides an excellent view of this standard little simple crater. It has steep walls and a flat floor with two tiny hills as central peaks. de Morgan's walls are not nearly as bright as those of nearby Cayley, suggesting that the smaller crater is older. This is supported by noting that Cayley truncates one of the dark rays from Dionysius, whereas a piece of the dark ejecta seems to impinge on the western wall of de Morgan. But two other dark areas occur along the northern wall so perhaps this is just a buried pyroclastic layer - the same one that is the source of Dionysius' rays. - tychocrater Sep 26, 2007
Elger
(IAU Directions) DE MORGAN.--A brilliant little crater, 4 miles in diameter, on the plain S. of the Ariadaeus cleft.
Wikipedia
Additional Information
- IAU page: De Morgan
- Depth data from Kurt Fisher database
- Viscardy, 1985: 1.9 km
Nomenclature
- Named for Augustus de Morgan (June 27, 1806 – March 18, 1871), an Indian-born British mathematician and logician. He formulated De Morgan's laws and was the first to introduce the term, and make rigorous the idea of mathematical induction.
LPOD Articles
Bibliography
Harold Hill. A Portfolio of Lunar Drawings, page 5 (the Ariadaeus rille).
Augustus de Morgan in the Sourcebook Project (William R. Corliss)
- Page 127 in Mysterious Universe, a handbook of astronomical anomalies (1979) :
- The Maedler Phenomenon (Richard Baum, Strolling Astronomer, 1978).
Named Features -- Prev: De Moraes -- Next: De Roy
