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New close-up image of Ceres’s double bright spots

close-up of Ceres's bright spots

Cool image time! The Dawn science team has released a some new close-up images of Ceres, including a much higher resolution image of the dwarf planet’s double bright spot, which now resolves itself into a cluster of two larger spots with a half dozen smaller spots scattered nearby.

The region with the brightest spots is in a crater about 55 miles (90 kilometers) across. The spots consist of many individual bright points of differing sizes, with a central cluster. So far, scientists have found no obvious explanation for their observed locations or brightness levels.

“The bright spots in this configuration make Ceres unique from anything we’ve seen before in the solar system. The science team is working to understand their source. Reflection from ice is the leading candidate in my mind, but the team continues to consider alternate possibilities, such as salt. With closer views from the new orbit and multiple view angles, we soon will be better able to determine the nature of this enigmatic phenomenon,” said Chris Russell, principal investigator for the Dawn mission based at the University of California, Los Angeles.

To my eye, these bright areas resemble a wide flat caldera of a volcano. Instead of being at the top of a peak, the caldera is like a lava pool, almost like a large lake. In this case, the large spots are lakes of frozen ice that periodically melt and flow. The smaller spots are likely smaller vents where water can bubble up from below during active periods. When not active, the water will be frozen. Since ice is white and Ceres is very dark, the pools and vents appear extremely bright in these images.

I am speculating however. We will have to wait for much better images to know for sure.

Genesis cover

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  • BSJ

    How bright are they for real?

    Is the dark surface “as dark as charcoal” and the “white” areas just slightly less dark that charcoal?

  • BSJ

    Less *THAN* charcoal

  • See this article. The important quote is this:

    Surface brightness. Ceres is darker than any of the moons. Its surface reflects only about 10% of the light that hits it, compared to 20% for Oberon and Umbriel, and 60%, 70%, and 80% for Mimas, Rhea, and Tethys, respectively. Exposed water ice is not stable for long periods on Ceres’ dayside, because Ceres is much closer to the Sun than the moons are, which could explain the darkness; ice would sublimate away, leaving behind a surface lag of whatever other material is in Ceres’ crust, including rocky and carbonaceous material, both of which are much, much darker than ice.

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