Cryovolcanic flows on Ceres

Post contributed by Dr. Katrin Krohn, German Aerospace Center, Institute of Planetary Research

The dwarf planet Ceres is a weakly differentiated body with a shell dominated by an ice-rock mixture and ammoniated phyllosilicates, which has a variety of flow features visible on its surface. Flow features are common features on planetary surfaces and they indicate the emplacement of viscous material. Many of the observed flows on Ceres originate from distinct sources within crater interiors and on crater flanks.

Haulani_IAG

Image 1: LAMO FC mosaic of Haulani crater. A: Well-defined smooth lobes (LAMO FC21A0049392_16002071420F1F.IMG). B: Multiple flow stages on western crater flank (FC21A0046469_15350155540F1C.IMG).

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Transient flow of water on Vesta suggested by gullies and lobate deposits.

Post contributed by Jennifer Scully, Dept. of Earth, Planetary & Space Sciences, University of California Los Angeles

Vesta is the second most massive asteroid in the asteroid belt, with a mean diameter of 526 km (e.g. Russell et al., 2012). High resolution images from the Dawn Mission have detected curvilinear and linera gully forms and lobate deposits in craters and on steep slopes on its surface (Scully et al., 2015).

Image 1: (a) Fonteia crater, which contains linear gullies. (b) Unmapped version and (c) mapped version of linear gullies. White arrows highlight an example linear gully in (b).

Image 1: (a) Fonteia crater, which contains linear gullies. (b) Unmapped version and (c) mapped version of linear gullies. White arrows highlight an example linear gully in (b).

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Unconsolidated Gravels on Asteroid Itokawa

Posted by Dr. Hirdy Miyamoto,    

(Re-posted from IAG Image of the Month, November 2007)

In November 2005, the Hayabusa spacecraft performed touchdown rehearsals, imaging navigation tests, and two touchdowns on Itokawa, which is by far the smallest asteroid ever studied at high resolution.

Asteroid Itokawa

Image courtesy ISAS/JAXA and University of Tokyo

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A “Rubble-pile” Asteroid

Posted by Hirdy Miyamoto, University of Tokyo, Japan.

(Re-posted from IAG Image of the Month, August, 2007)

This image of asteroid 25143 Itokawa, photographed by the Japanese Hayabusa spacecraft during a two-month encounter, September-December, 2005, is suggestive of the “rubble-pile” conception of asteroid formation and structure.

Asteroid 25143 Itokawa

Asteroid 25143 Itokawa. Image courtesy ISAS/JAXA Japanese space agency.

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