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

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Presentation transcript:

The Transient Universe: AY 250 Spring 2007 Near Earth Asteroids and Kuiper Belt Objects Geoff Bower

The Transient Universe: AY 250 Spring 2007 Jewitt 2000

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

The Transient Universe: AY 250 Spring 2007 Fatalities

The Transient Universe: AY 250 Spring 2007 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

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 Sedna Discovery Brown et al ”/3.1 hour R=20.5 Palomar Oschin telescope

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

The Transient Universe: AY 250 Spring 2007 Eris/UB313 The Largest Dwarf Planet 1.4”/hr Brown et al 2005 R=18 mag / 100 km diameter 96 AU

The Transient Universe: AY 250 Spring 2007 KBO Distribution

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

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

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

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

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