Astronauts and Robots 2015: JPL
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American Astronautical Society, Astronauts and Robots: Partners in Space Exploration, May 12-13, 2015 - http://astronautical.org/event/astronauts-robots
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Astronauts and Robots 2015: JPL
- 1. At the dawn of the solar system the solar nebula was rich in radioactive heat sources, a portion of which decayed rapidly within the first few million years – Were there chemical variations in the nebular disk? – How did the formation time affect the outcome? – What processes have mixed material post-formation?
- 2. Vesta Size in Context Lutetia Mathilde Ida Eros Gaspra Steins Annefrank Itokawa Braille Vesta Ceres Ceres and Vesta Size in Context
- 4. Dawn at Ceres Next Up: Survey Orbit: 4400 km alt. Jun 5 –Jul 1 2015 HAMO: 1470 km alt. Aug 4 – Oct 8 2015 LAMO: 375 km alt. Dec 1 2015 – Mar 6 2016 HAMO: High Altitude Mapping Orbit LAMO: Low Altitude Mapping Orbit
- 5. Dawn at Ceres 13500 km Altitude 20x Hubble
- 11. 0 200 400 Abundance of hydrogen (ppm) Vesta is a dry igneous body with a veneer of hydrated mater
- 12. Marcia Crater on Vesta
- 13. Marcia Crater on Vesta
- 14. Cornelia Crater on Vesta
- 15. Infalls, carbonates, evaporites? Dirty Ice (rock? Salts?) on top of Frozen Ocean Metal-Rich Core and/or Dry Silicates Hydrated Silicates
Notas del editor
- What processes influenced the gradient in material seen today from the dry rocky bodies of the inner solar system through the asteroid belt to the water and volatile-rich outer solar system?
- Dawn at Ceres – starship enterprise smooth craters. Just finished the first science orbit at 13500 km, watched Ceres rotate beneath the spacecraft
- Big relaxed basin.
- Polygonal craters – light/dark regions, smooth and rough terrains
- Dawn mapped in great detail the geology and the minerals on the surface, found a diversity of materials, and giant tectonic cracks caused by giant impacts. Big impacts – more meteorites than any other body – intact building block protoplanet
- Colors indicate concentration of H – 4x expected – indicates water from exogenic material – same as delivery of water to inner planets
- Bright spots – very bright, not yet resolved at 2 km/px as bright as salts or ice. Together with the cratering record on the surface and the overall surface morphology, it appears that Ceres has a layer of ice mixed with rock and salts. This is important because it suggests that the rock interacted with the past liquid ocean and there was circulation of material via convection, between the ocean floor and the surface
- Comets/asteroids in continuous spectrum – delivered water to earth and inner planets