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November 28, 2007


Filed under: , — chuckwood @ 12:01 am

full res image from Chang’e lunar orbiter

The full resolution version of the Chang’e first image has appeared on the Planetary Society website (make sure to hit “Click to enlarge” button at bottom of image there), allowing more marveling of the capability of the orbiter. This full scale small piece from the entire image shows the 66-km wide crater Gill, displaying two levels of detail. First is the general sharpness of edges of most of the obvious craters, and the second almost requires refocusing to notice that there are hundreds of sub-kilometer scale impact pits. Some areas have many (cluster near the upper right) and other areas (lower left) have almost none. This uneven distribution suggests that some may be secondary craters (from Hale at 74°S??), as does the visual impression that there are few fresh craters with diameters intermediate between the sub-kilometer ones and those 3-5 km and larger; detailed crater counts are necessary to see if there is a gap. Another fascinating detail, subtle but real, is the sharp boundary between darker material and less-dark cutting across the east edge of Gill. Look closely and you can trace the boundary all across the crater and its rim, but not beyond it. This may be partially an optical effect - i.e. not real - but I doubt that is the entire explanation for I see similar, but smaller, edges in places across the bottom right of the entire image. If this dark material is real I have no idea what would cause a thin layer that doesn’t extend beyond the crater. The question of secondary versus primary craters and the possible existence of a new kind of deposit are examples of the types of investigations that can be undertaken with this new generation of high resolution images.

Chuck Wood

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  1. Oh, yes, that something different! But compare it to Kaguya’s today 3D picturs:

    Comment by SandiBandi — November 28, 2007 @ 6:26 am

  2. I scrolled through the larger image, and felt like I was flying in for a landing. Wow!


    Comment by kayjunior — November 28, 2007 @ 4:43 pm

  3. Yesterday I made this out of Kaguya’s movie and screen from Virtula Moon Atlas:

    Comment by SandiBandi — November 29, 2007 @ 6:43 am

  4. Sandi - I like your overlay on the shaded relief map - it shows how small an area each of the very high res strips cover. With long spacecraft life there should be many of the strips covering the Moon multiple times!

    Comment by chuckwood — November 29, 2007 @ 7:43 am

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