Difference between revisions of "November 25, 2012"

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Kepler's rays would find more admirers if they were not so near the long and glorious Copernicus rays and the brighter ones from Aristarchus.  
 
Kepler's rays would find more admirers if they were not so near the long and glorious Copernicus rays and the brighter ones from Aristarchus.  
 
Raf's images emphasize a feature of Kepler's ejecta that I have noticed often but not thought enough about. An area extending out about 1.5 to  
 
Raf's images emphasize a feature of Kepler's ejecta that I have noticed often but not thought enough about. An area extending out about 1.5 to  
2 times Kepler's diameter (inner dark outline in negative image) is covered with bright ray-like material. Surrounding that is another discontin-
+
2 times Kepler's diameter (inner dark outline in negative image) is covered with bright ray-like material. Surrounding that is another discontinuously covered and not as bright annulus (larger black outline). The boundary of this area on the west is where broad swaths of Kepler's rays  
uously covered and not as bright annulus (larger black outline). The boundary of this area on the west is where broad swaths of Kepler's rays  
 
 
seem truncated, extending only as narrow rays beyond. The inner bright zone is continuously covered by ejecta; the outer area must be discontinuously draped with ejecta. An interesting thing about the outer area is that it is bounded on the west by a narrow fringe of dark lava. It is unlikely  
 
seem truncated, extending only as narrow rays beyond. The inner bright zone is continuously covered by ejecta; the outer area must be discontinuously draped with ejecta. An interesting thing about the outer area is that it is bounded on the west by a narrow fringe of dark lava. It is unlikely  
 
that ejecta could effect the path of lava or be affected by it. It is possible that the outer zone of brightness is not real, that there seems to be a  
 
that ejecta could effect the path of lava or be affected by it. It is possible that the outer zone of brightness is not real, that there seems to be a  

Revision as of 15:57, 14 March 2015

Areas of Confusion

LPOD-Nov25-12.jpg
image by Raffaele Barzacchi, Italy

Kepler's rays would find more admirers if they were not so near the long and glorious Copernicus rays and the brighter ones from Aristarchus. Raf's images emphasize a feature of Kepler's ejecta that I have noticed often but not thought enough about. An area extending out about 1.5 to 2 times Kepler's diameter (inner dark outline in negative image) is covered with bright ray-like material. Surrounding that is another discontinuously covered and not as bright annulus (larger black outline). The boundary of this area on the west is where broad swaths of Kepler's rays seem truncated, extending only as narrow rays beyond. The inner bright zone is continuously covered by ejecta; the outer area must be discontinuously draped with ejecta. An interesting thing about the outer area is that it is bounded on the west by a narrow fringe of dark lava. It is unlikely that ejecta could effect the path of lava or be affected by it. It is possible that the outer zone of brightness is not real, that there seems to be a boundary only because of a chance ribbon of lava that separates equally bright material on either side. What do you think?

Chuck Wood

Related Links
Rükl plate 30
21st Century Atlas chart 22.

Yesterday's LPOD: How Old is This Crater?

Tomorrow's LPOD: Fish Scales



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