Dawn
Dawn
Dawn Mission
Dawn
Dawn
How Do We Get There?
Dawn
Dawn
DAWNA Journey to the Beginning of the Solar System
Vesta
Travel Plans: Dawn’s Itinerary
The Dawn Spacecraft will travel
• 6.3 billion kilometers
• Almost ten years
• To the asteroid 4 Vesta and Dwarf planet 1 Ceres.
Ceres
Dawn
Dawn
Travel Plans: Cross-Country Trip
• A 3000 mile trip from Los Angeles to New York City requires:
• 120 gallons of fuel
–16 cubic feet storage
–adds 685 pounds weight
• 4 days travel time
Dawn
Dawn
A Trip to Mars
• A 35 million mile trip from Earth to Mars requires:
• 900 metric tons of rocket fuel
• 6 months travel time
Dawn
Dawn
Interplanetary Trajectory
Dawn
Dawn
Hydrazine tank
45 kg capacity
Xenon tank
450 kg capacity
Folded solar arraysIon thruster
2.3 meters
Ion Propulsion System
Dawn
Dawn
Thrust vs. Time
To change velocity 1000 m/s using: Type of Propulsion Ion Propulsion Conventional Chemical Mass of propellant 25 kg Xenon 300 kg chemical Time 100 days 20 minutes Thrust 92 mN 500 N
