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  1. #1
    Join Date
    Jan 2012
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    11

    Bulls-eye (concentric craters)

    Please tag and discuss images you notice with bulls-eye / concentric craters.

  2. #2
    Join Date
    May 2012
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    I see a lot of central craters, surrounded by a circle of craters. Usually the central crater looks like a cone, which might mean the surrounding craters are actually volcanic subsidence.

    So do I mark this as a single feature, a "bulls-eye," or as group of crater markings?

  3. #3
    Join Date
    Jan 2012
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    87
    Hi JimNumm,

    If you could post an image of what you are talking about, that would be very helpful. I think you might be talking about the ejecta deposit around a crater, but I can't be sure until I see an image.

  4. #4
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    May 2012
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    Bulls-eye crater sample

    I can't seem to upload a sample today.

    I'm looking at 00001.png.There is a large crater in the center of the photo. Half way to the bottom is a smaller, sharp-edged crater, with larger, less-defined craters at 12, 3 and 6 o'clock, with a hint of one between 9 and 10.

    Is this what you mean by a bulls-eye crater? And if so, do I mark the complex as a single crater, or mark the center as one and the surrounding ones separately?

  5. #5
    Join Date
    Jan 2012
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    87
    Hi JimNumn,

    I'm sorry, I don't know which image is 00001.png, so I can't comment.
    Could you try to upload the image again? I would love to help you, but can't do that without seeing the image.

    However, I can tell you that if you are in fact seeing a concentric crater, then that is 1 crater, not 2, and should be marked as a single crater. The bulls-eye is caused by different layers in the surface behaving slightly differently. Read more about that in the Surface Features Glossary, where you will also find a link to an image of a concentric crater on the Moon.

  6. #6
    Join Date
    Oct 2001
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    The Space Coast
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    Oh - so it's not a second impact making a "hole in one". I didn't realize that. Thanks for the clarification!

    CJSF
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    Flying so fast there was no day or night
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    Davy, Davy Crockett
    The buckskin astronaut
    Davy, Davy Crockett
    There's more than we were taught"

    -They Might Be Giants, "The Ballad Of Davy Crockett (In Outer Space)"


    lonelybirder.org

  7. #7
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    Jan 2012
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    Happy to help <smiley face>

  8. #8
    Join Date
    Aug 2019
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    Decent, need to accomplish something like this with mine.

  9. #9
    Join Date
    Feb 2005
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    11,642
    Something to do as a very long term art project--have a series of ever smaller asteroids make ever smaller craters.

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