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I Dawn moving to low Ceres orbit, mission extended until hydrazine runs out

  1. Oct 29, 2017 #1061

    OmCheeto

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    2016 Award

    As do we both.
    But Ahuna Mons isn't big enough to cause the anomaly.

    "However, since the feature is only 17 km wide, it is not possible to associate the anomaly with the feature itself, but only with the general surrounding area. Positive anomaly in the Ahuna Mons region can be explained by an extrusion of high-density brines to the surface..."

    My guess is, that whatever is causing the anomaly, created Ahuna Mons.

    ps. I'm greatly looking forward to perihelion. (April, 2018!)
     
  2. Oct 30, 2017 #1062

    1oldman2

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    Somewhere, far back in this thread I mentioned to Marcus that Ceres was going to be in demand for mining eventually. I wonder what the value of all that potential "Fossil" Ocean will be in one hundred years or so.
    Curious about interpreting the map I did a little reading and thought I'd post this, a pretty good explanation overall.
    https://pubs.usgs.gov/fs/fs-0239-95/fs-0239-95.pdf
    "The isostatic gravity anomaly is calculated by
    subtracting the gravitational effect of low-density
    mountain roots below areas of high topography.
    Although these roots have never been seen, their isos-
    tatic effect has been measured and models calculated
    using topography. Isostasy is typified by floating ice-
    bergs that have 90% of their mass of ice below water
    that supports a smaller mass of ice projecting above
    water."
    (Somewhat still on subject, and very cool also.):thumbup:
    https://mrdata.usgs.gov/geophysics/gravity.html
    https://solarsystem.nasa.gov/galleries/flowing-in-flowing-out-of-aelia
     
    Last edited: Oct 30, 2017
  3. Nov 9, 2017 #1063

    1oldman2

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  4. Nov 12, 2017 #1064
    There's an interesting conundrum about Ceres, a conundrum suggested by Vesta. That latter asteroid had gotten hot enough to melt early in the Solar System's history, most likely from short-lived radionuclides like aluminum-26. If Ceres had enough of these radionuclides, then it may have been enough to melt its interior. So could Ceres have had an interior ocean in its past? An ocean like those of Europa and Enceladus.
     
  5. Nov 12, 2017 #1065

    mfb

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    Staff: Mentor

    See post #1057. It could still have liquid water, and it looks like it had an ocean in the past. It won't be ocean-like today, however, more like wet soil.
     
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