Difference between revisions of "April 9, 2024"

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=The Little Things Also Count=
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=50 Shades of Gray=
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Originally published March 26, 2014
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Originally published December 20, 2013
 
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<em>south up image by [mailto:mwirths@starband.net Michael Wirths], Baja California, Mexico</em><br />
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<em>image by [mailto:bgshelton@me.com Brian Shelton], Oconee, Georgia</em><br />
 
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I just came home late from giving my 4th talk in an astronomy series I am presenting at the local library. I was going to find a previous LPOD and reuse it. But I made the mistake of looking at the email that had come in the last 3 hours and discovered Mike's latest from the high peaks of Baja California, and just had to describe it. A quick glance across the image shows the complex rilles at the bend in the floor of Fracastorius (1000 m drop off - check QuickMap), the Neander Fault near top left, and Rheita E, the miniature Schiller at extreme top right. But then my eye more slowly caressed the scene, finding new details to enjoy. Between the Neander Fault and Fracastorius is a very obvious low plain with very few impact craters. A similar smaller, smooth plain is between the first one and Santbech (lower left). Don Wilhelms, the master US Geological Survey mapper, proposed that many of the 20-30 km wide craters here were secondaries from the formation of the Imbrium Basin, Because these smooth plains are not as cratered as the surrounding terrain it suggests that they might not be fluidized Imbrium ejecta but conceivably could be some sort of non-mare volcanism. But there is as yet little evidence for such volcanism, so most lunar scientists would favor the ejecta interpretation. High Sun [http://bit.ly/1iyuulB lighting] does show some odd craters in the smooth plains that may be dark halo craters, so the plains may be mare lavas veneered with light-hued ejecta. Another anomalous feature is Beaumont, the miniature Fracastorius near bottom right. Its floor is topographically agitated with small hills and some craters, perhaps secondaries from Theophilus. Finally, Mike's image has captured some faint roughly east-west lineations northwest of Piccolomini. These are crater chains that are not quite radial to Piccolomini, and they are not quite parallel to the Abulfeda Crater Chain. They appear to be secondary crater chains, but is the primary Piccolomini or Imbrium?<br />
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I grew up observing the Moon with newtonian reflectors in the northern hemisphere so I still feel the Moon should be south up. But in 1960 the IAU switched north and
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south and east and west and I generally ignored it. But when <em>The Modern Moon</em> was being designed in 2002, the publisher, <em>Sky the Telescope,</em> wanted the illustrations
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to have north up to be consistent with the Rükl <em>Altas</em> and so it was. Mostly in LPOD the images are north up just because that is widespread use now, but sometimes -
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especially when looking at the southern limb - it seems more natural to have south up. So Brian's image is a good compromise with east up. Of course, that is the way
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the full Moon appears in the sky when rising. This image, from a first time LPOD contributor, is quite sharp, but what is really excellent is the many shades of tonal
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variation (which I have enhanced more here). Look at any mare to see grayness variations from very light to almost black. This really helps to document the various
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histories and processes, from dark young mare - if titanium-rich - to lighter and lighter surfaces as veneers of rays accumulate. Explore the shades of gray.
 
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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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<strong>Technical Details</strong><br />
 
<strong>Technical Details</strong><br />
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18&quot; Starmaster dob and a PGR Grasshopper 3 camera.<br />
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December 18, 2013. Astro-Physics 160 mounted on an AP900 using a PGR Grasshopper video camera. The photo is actually a stitched image of a number of stacked images yielding detailed hi-res 27MB combined result.<br />
 
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<strong>Related Links</strong><br />
 
<strong>Related Links</strong><br />
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<em>[[21st Century Atlas of the Moon|21st Century Atlas]]</em> chart 6.<br />
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<em>[[21st Century Atlas of the Moon|21st Century Atlas]]</em> charts FM 1-4.<br />
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Mike's bed and breakfast astronomy [http://www.bajadarkskies.com website]<br />
 
 
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<p><b>Yesterday's LPOD:</b> [[April 8, 2024|A Snake with Two Heads]] </p>
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<p><b>Yesterday's LPOD:</b> [[April 8, 2024|Stripped of Context, 2.0]] </p>
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<p><b>Tomorrow's LPOD:</b> [[April 10, 2024|Faster Than a Speeding Asteroid?]] </p>
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<p><b>Tomorrow's LPOD:</b> [[April 10, 2024|DAO]] </p>
 
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Latest revision as of 02:33, 9 April 2024

50 Shades of Gray

Originally published December 20, 2013 LPOD-Dec20-13.jpg
image by Brian Shelton, Oconee, Georgia

I grew up observing the Moon with newtonian reflectors in the northern hemisphere so I still feel the Moon should be south up. But in 1960 the IAU switched north and south and east and west and I generally ignored it. But when The Modern Moon was being designed in 2002, the publisher, Sky the Telescope, wanted the illustrations to have north up to be consistent with the Rükl Altas and so it was. Mostly in LPOD the images are north up just because that is widespread use now, but sometimes - especially when looking at the southern limb - it seems more natural to have south up. So Brian's image is a good compromise with east up. Of course, that is the way the full Moon appears in the sky when rising. This image, from a first time LPOD contributor, is quite sharp, but what is really excellent is the many shades of tonal variation (which I have enhanced more here). Look at any mare to see grayness variations from very light to almost black. This really helps to document the various histories and processes, from dark young mare - if titanium-rich - to lighter and lighter surfaces as veneers of rays accumulate. Explore the shades of gray.
Chuck Wood

Technical Details
December 18, 2013. Astro-Physics 160 mounted on an AP900 using a PGR Grasshopper video camera. The photo is actually a stitched image of a number of stacked images yielding detailed hi-res 27MB combined result.

Related Links
21st Century Atlas charts FM 1-4.

Yesterday's LPOD: Stripped of Context, 2.0

Tomorrow's LPOD: DAO

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