Difference between revisions of "April 16, 2011"
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image by [mailto:mwirths@starband.net Michael Wirths], Baja Dark Skies Inn, Baja California, Mexico<br /> | image by [mailto:mwirths@starband.net Michael Wirths], Baja Dark Skies Inn, Baja California, Mexico<br /> | ||
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| − | Calippus and Calippus C are two circular features of almost the same size. C is half missing; | + | Calippus and Calippus C are two circular features of almost the same size. C is half missing; |
| − | perhaps a birth defect, resulting from its formation on the front of the Caucasus Mountains. | + | perhaps a birth defect, resulting from its formation on the front of the Caucasus Mountains. |
| − | There was nothing to shore up its western wall, and later Imbrium lavas covered the spray of | + | There was nothing to shore up its western wall, and later Imbrium lavas covered the spray of |
| − | ejecta that would have made a wall if there was anything to built on. With a diameter of 32 | + | ejecta that would have made a wall if there was anything to built on. With a diameter of 32 |
| − | km, Calippus would be expected to have wall slumps and central peak, perhaps even massive | + | km, Calippus would be expected to have wall slumps and central peak, perhaps even massive |
| − | stepped terraces like [http://the-moon.wikispaces.com/Godin Godin]. But its steep walls and peakless interior makes it look more like | + | stepped terraces like [http://the-moon.wikispaces.com/Godin Godin]. But its steep walls and peakless interior makes it look more like |
| − | [http://the-moon.wikispaces.com/Proclus Proclus]. In fact, the alcove on the western rim suggests that Calippus - like Proclus - formed | + | [http://the-moon.wikispaces.com/Proclus Proclus]. In fact, the alcove on the western rim suggests that Calippus - like Proclus - formed |
| − | by an oblique impact. But Calippus is old enough - notice the lack of rim crest sharpness - that | + | by an oblique impact. But Calippus is old enough - notice the lack of rim crest sharpness - that |
| − | any rays that would prove it are long since space-weathered to obscurity.<br /> | + | any rays that would prove it are long since space-weathered to obscurity. |
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<em>[mailto:tychocrater@yahoo.com Chuck Wood]</em><br /> | <em>[mailto:tychocrater@yahoo.com Chuck Wood]</em><br /> | ||
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Mike's new [http://www.bajadarkskies.com website, observatory and home]<br /> | Mike's new [http://www.bajadarkskies.com website, observatory and home]<br /> | ||
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<p><b>Yesterday's LPOD:</b> [[April 15, 2011|On the Fly]] </p> | <p><b>Yesterday's LPOD:</b> [[April 15, 2011|On the Fly]] </p> | ||
<p><b>Tomorrow's LPOD:</b> [[April 17, 2011|The Straight Rille]] </p> | <p><b>Tomorrow's LPOD:</b> [[April 17, 2011|The Straight Rille]] </p> | ||
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{{wiki/ArticleFooter}} | {{wiki/ArticleFooter}} | ||
Revision as of 17:02, 1 March 2015
Almost Twins
image by Michael Wirths, Baja Dark Skies Inn, Baja California, Mexico
Calippus and Calippus C are two circular features of almost the same size. C is half missing;
perhaps a birth defect, resulting from its formation on the front of the Caucasus Mountains.
There was nothing to shore up its western wall, and later Imbrium lavas covered the spray of
ejecta that would have made a wall if there was anything to built on. With a diameter of 32
km, Calippus would be expected to have wall slumps and central peak, perhaps even massive
stepped terraces like Godin. But its steep walls and peakless interior makes it look more like
Proclus. In fact, the alcove on the western rim suggests that Calippus - like Proclus - formed
by an oblique impact. But Calippus is old enough - notice the lack of rim crest sharpness - that
any rays that would prove it are long since space-weathered to obscurity.
Chuck Wood
Technical Details
2011-04-11 20:37 PST. Starmaster 18" (Zambuto optics) + Lumenera Infinity 2-2 + TT R/IR filter + 4X's Televue Powermate + Lucam recorder; Avistack, Photoshop CS
Related Links
Rükl plate 13
Another view
Mike's new website, observatory and home
Yesterday's LPOD: On the Fly
Tomorrow's LPOD: The Straight Rille
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