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Spacedesign Asteroid Initiative Presentation

Spacedesign Asteroid Initiative Presentation. By Joseph M. Clay Presenter: Joseph M. Lepore Spacedesign Corporation 914 Main St. Suite 913 Houston, TX 77002 www.spacedesign.com. Forces on Asteroids. Summary of Orbital forces on an asteroid Gravity Collisions

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Spacedesign Asteroid Initiative Presentation

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  1. Spacedesign Asteroid Initiative Presentation By Joseph M. Clay Presenter: Joseph M. Lepore Spacedesign Corporation 914 Main St. Suite 913 Houston, TX 77002 www.spacedesign.com

  2. Forces on Asteroids • Summary of Orbital forces on an asteroid • Gravity • Collisions • Radiation Pressure (4.7-9.3 nPa at 1 AU) • Direct incident • Yarkovsky effect - directional radiation pressure caused by temperature variation from rotation (very small) • Solar wind (1-6 nPa at 1 AU) • Others possible? • magnetic, mass loss, mass flow, etc.

  3. Simple Relations for Radiation Pressure and Solar Wind Pressure • Radiation pressure – solar intensity decreases with the inverse square of distance from Sun. • Solar wind pressure – assuming constant velocity, the solar wind density decreases with the inverse square of distance from Sun

  4. Average Radiation and Solar Wind Pressures vs. Distance from Sun Earth 1.000 AU Mercury 0.387 AU Venus 0.723 AU

  5. Control of Radiation Pressure and Solar Wind Pressure • Both pressures can be controlled by changing the area exposed towards the Sun. Test case: Eros 11.2 km 33.4 km Amin= 98.5 km2 Amax= 374.1 km2 11.2 km

  6. Control of Radiation Pressure and Solar Wind Pressure • Radiation pressure has an added advantage that it can be controlled by changing optical properties. Test case: Eros a = 1.00 a = 0.00 Changing Optical Properties

  7. Radiation Pressure and Solar Wind Area Change Forces † But not all asteroids are shaped like a peanut.

  8. Simple Orbital Mechanics Test Not actual location of Earth, just for testing Sun mEros=6.69x1015 kg 433 Eros ∆v B r A=169,496,800 km r B=218,116,800 km r Earth=6378 km

  9. Results of Orbital Mechanics Test • An asteroid on a direct collision with our Test Earth would require 37,400 Earth years of pushing with Radiation Pressure and Solar Wind Pressure.

  10. Markets for Partnership • Can Markets be defined to support NASA’s Asteroid Initiative? Technology 2C Technology 2A Market 2 Technology 2B Technology 2D Needed Technology Drivers Technology 1A Technology 1C Market 1 Technology 1B Technology 1D Needed Technology Drivers

  11. NASA’s Current Architecture • SEP HEO Heliocentric Orbit Orion • PLSS MACES Lunar DRO SLS Best use of SLS and Orion Earth

  12. Conclusion • Radiation Forces and Solar Wind Forces are significant but not capable of full scale asteroid deflection. • Other forces must be found to successfully deflect asteroids. • Market forces could be used to guide the NASA Architecture. Perhaps a public-private partnership could help.

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