Dawn

17 August 2009

 The Dawn Framing Camera
zum Bild The Dawn Framing Camera
Dawn is an interplanetary NASA Discovery-class mission successfully launched on Sep. 27, 2007 (http://dawn.jpl.nasa.gov/). Dawn's goal is to achieve an understanding of the conditions and processes acting at the solar system's earliest epoch.

Dawn investigates the internal structure, density and homogeneity of two complementary protoplanets, 1 Ceres and 4 Vesta, that have escaped collisional disruption since their formation, by measuring their mass, shape, volume and spin rate with imagery, and gravity. Dawn records the protoplanets' elemental and mineral composition to determine their thermal history and evolution and provides context for meteorites (asteroid samples already in hand).

Dawn images Ceres’ and Vesta's surfaces to determine their bombardment and tectonic history and uses measurements of the gravityand spin state to estimate the size of any metallic core, and infrared and gamma ray spectrometry to search for water-bearing minerals.

Science goals

  • Determine internal structure,
     Global mosaic of Vesta (created from images taken from DAWN)
    zum Bild Global mosaic of Vesta (created from images taken from DAWN)
    density and homogeneity of two complementaryprotoplanets, 1 Ceres and 4 Vesta, one wet and one dry
  • Determine shape, size, composition and mass
  • Study surface morphology, cratering
  • Determine thermal history and size of core
  • Understand role of water in controlling asteroid evolution
  • Test the current paradigm of Vesta as the howardite, eucrite, and diogenite (HED) parent body
  • Study which, if any, meteorites come from Ceres
  • Provide a geologic context for HEDs

Status

Dawn uses a solar ion propulsion system for its interplanetary journey. It has  arrived at Vesta on Jul 2011 and orbited the body for one year. Presently it is en route to  Ceres, where it is expected to arrive by Feb. 2015.

The DLR Institute of Planetary Research has contributed to developing and building, under the leadership of the Max Planck Institute, Lindau, the two Framing Cameras onboard the Dawn Mission. The Asteroids and Comets Section is also represented in the Dawn Science Team by a Co-Investigator.

 

 




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