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Near Earth Asteroids and Kuiper Belt Objects

Near Earth Asteroids and Kuiper Belt Objects. Geoff Bower. Jewitt 2000. Tunguska. 50 km diameter. Fatalities. Estimates of Impact Rate. Lunar cratering D ~ E^1/3.5 D ~ 3 – 100 km N(D) ~ D^-1.7 Survey back to 3 Gyr One 10 km impact/10^8 y Telescopic surveys. NEA Search Requirements.

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Near Earth Asteroids and Kuiper Belt Objects

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  1. Near Earth Asteroidsand Kuiper Belt Objects Geoff Bower The Transient Universe: AY 250 Spring 2007

  2. The Transient Universe: AY 250 Spring 2007 Jewitt 2000

  3. Tunguska 50 km diameter The Transient Universe: AY 250 Spring 2007

  4. Fatalities The Transient Universe: AY 250 Spring 2007

  5. Estimates of Impact Rate • Lunar cratering • D ~ E^1/3.5 • D ~ 3 – 100 km • N(D) ~ D^-1.7 • Survey back to 3 Gyr • One 10 km impact/10^8 y • Telescopic surveys The Transient Universe: AY 250 Spring 2007

  6. The Transient Universe: AY 250 Spring 2007

  7. The Transient Universe: AY 250 Spring 2007

  8. The Transient Universe: AY 250 Spring 2007

  9. The Transient Universe: AY 250 Spring 2007

  10. NEA Search Requirements • Depth • For small, distant objects • Large FOV • For completeness • High resolution • Cadence • For accurate orbits • Rapid data reduction The Transient Universe: AY 250 Spring 2007

  11. Sedna Discovery Brown et al 2004 4.6”/3.1 hour R=20.5 Palomar Oschin telescope The Transient Universe: AY 250 Spring 2007

  12. Inner Oort Cloud Object Sedna Brown et al 2004 76 – 480 AU The Transient Universe: AY 250 Spring 2007

  13. Eris/UB313The Largest Dwarf Planet 1.4”/hr Brown et al 2005 R=18 mag 2400 +/ 100 km diameter 96 AU The Transient Universe: AY 250 Spring 2007

  14. KBO Distribution The Transient Universe: AY 250 Spring 2007

  15. KBO Variability 6.7 hour period Sheppard & Jewitt The Transient Universe: AY 250 Spring 2007

  16. Colors of KBOs Jewitt & Luu 2001 The Transient Universe: AY 250 Spring 2007

  17. 10 km size threshold ~10 objects w/size 1000 km N (> size) ~ size^-3  10^7 new objects discovered 1 km size threshold  10^10 new objects The Predictions for P* and LSST The Transient Universe: AY 250 Spring 2007

  18. Pan Starrs 10^7 objects 5 y / 10 sec integrations ~ 10^7 observations 1 object/observation LSST 10^10 objects  1000 objects/observation Transient/Rock Confusion The Transient Universe: AY 250 Spring 2007

  19. Transient/Rock Confusion II • Proper motion • Inclination to ecliptic • Catalog • Color • Multi-wavelength activity • Universal cadence The Transient Universe: AY 250 Spring 2007

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