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Thread: Dry Heiligenschein

  1. #1
    Join Date
    Mar 2004
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    15,801

    Dry Heiligenschein

    In another forum, I saw this link to an explanation of the enhanced retroreflection near the shadow of the rovers' mast head, as demonstrated in thumbnail:


    Larger Image

    They call it an opposition effect or "dry heiligenschein" -- which is just so fun to say.

    In my own experience, I was familiar with such an effect viewing dew on grass, but, of course, dew was pretty much off my list for an explanation of similar on Mars, so I was glad to read about this.
    0 1 1 0 1 0 0 1 1 0 0 1 0 1 1 0 1 0 0 1 0 1 1 0 0 1 1 0 1 0 0 1 1 0 0 1 0 1 1 0 0 1 1 0 1 0 0 1 0 1 1 0 1 0 0 1 1 0 0 1 0 1 1 0 ...
    Skepticism enables us to distinguish fancy from fact, to test our speculations. --Carl Sagan

  2. #2
    Join Date
    Oct 2001
    Posts
    30,045
    I think I'll start using it as a cuss word: Oh, heiligenschein!"
    Everything I need to know I learned through Googling.

  3. #3
    Join Date
    Oct 2001
    Posts
    11,227
    The strongest I have ever seen it in was in the very dry dust (no rain for months) in a baseball field across the street from my house.

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