what is an asteroid?
DESCRIPTION
What is an Asteroid?. Asteroid Sizes. Where are they? Where do they come from?. 1. 2. 1. 4. 3. How do we study asteroid?. LINEAR NEO Search Systems. Asteroids: Years of Discovery. 1. Hubble!. EROS Asteroid 433. Hayabusa Visiting Asteroid Itokawa. - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/1.jpg)
What is an Asteroid?
![Page 2: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/2.jpg)
![Page 3: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/3.jpg)
![Page 4: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/4.jpg)
Asteroid Sizes
![Page 5: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/5.jpg)
Where are they?
Where do they come from?
![Page 6: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/6.jpg)
![Page 7: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/7.jpg)
1
1
2
34
![Page 8: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/8.jpg)
![Page 9: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/9.jpg)
![Page 10: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/10.jpg)
How do we study asteroid?
![Page 11: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/11.jpg)
LINEAR NEO Search Systems
![Page 12: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/12.jpg)
Asteroids: Years of Discovery
1
![Page 13: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/13.jpg)
Hubble!
![Page 14: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/14.jpg)
![Page 15: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/15.jpg)
![Page 16: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/16.jpg)
EROS Asteroid 433
![Page 17: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/17.jpg)
![Page 18: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/18.jpg)
![Page 19: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/19.jpg)
Hayabusa Visiting Asteroid Itokawa
![Page 20: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/20.jpg)
Hayabusa Visiting Asteroid Itokawa
![Page 21: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/21.jpg)
Why are we interested in Asteroids?
![Page 22: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/22.jpg)
![Page 23: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/23.jpg)
![Page 24: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/24.jpg)
What happens if an Asteroid hits the Earth?
![Page 25: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/25.jpg)
![Page 26: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/26.jpg)
![Page 27: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/27.jpg)
![Page 28: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/28.jpg)
![Page 29: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/29.jpg)
![Page 30: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/30.jpg)
Earth Sterilizing Impact
Mass Extinction ImpactCivilization Threatening Impact
![Page 31: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/31.jpg)
What Happens When an Impact Takes Place?
Bolides (up to 5 MT)• Great fireworks display, no damageTunguska-class (15 MT) impact• Damage similar to large nuclear bomb (city-killer)• Average interval for whole Earth: 100 yr.• Minor risk relative to other natural disasters
(earthquakes, etc.)Larger local or regional catastrophes (e.g. 10,000 MT)• Destroys area equivalent to small country • Average interval for whole Earth: 100,000 yr.• Moderate risk relative to other natural disastersGlobal catastrophe (> 1 million MT)• Global environmental damage, threatening civilization• Average interval for whole Earth: 1 million years• Major risk relative to other natural disasters
![Page 32: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/32.jpg)
Could it Happen?
![Page 33: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/33.jpg)
![Page 34: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/34.jpg)
![Page 35: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/35.jpg)
Terrestrial Impact Frequency
year
century
million yr.
billion yr.
ten thousand yr.
100 millionmillion10,00010010.01
Hiroshima
Tunguska
K/T
TNT equivalent yield (MT)
Global catastrophe
Tsunami danger
![Page 36: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/36.jpg)
What Can We Do?
![Page 37: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/37.jpg)
Strategies
• Detect Project NEO (Near Earth Objects) http://neo.jpl.nasa.gov/• Deflect Gravitational Tractor Impactor• Destroy
![Page 38: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/38.jpg)
LINEAR NEO Search Systems
![Page 39: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/39.jpg)
![Page 40: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/40.jpg)
![Page 41: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/41.jpg)
Questions??
![Page 42: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/42.jpg)
Civilization Threatening Impact
![Page 43: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/43.jpg)
Mass Extinction Impact
![Page 44: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/44.jpg)
Earth Sterilizing Impact
![Page 45: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/45.jpg)
Known Kilometer-Size Near Earth Asteroids1000
500
1990 1995 2000
estimated total NEAs > 1 km
Spaceguard official start
![Page 46: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/46.jpg)
![Page 47: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/47.jpg)
![Page 48: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/48.jpg)
![Page 49: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/49.jpg)
![Page 50: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/50.jpg)
![Page 51: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/51.jpg)
Looks like a potato?
![Page 52: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/52.jpg)
![Page 53: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/53.jpg)
![Page 54: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/54.jpg)
![Page 55: What is an Asteroid?](https://reader035.vdocuments.us/reader035/viewer/2022062502/56813df1550346895da7cb1f/html5/thumbnails/55.jpg)