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Asteroid 99942 Apophis Size:350 m(1150 ft) Possible impact:Low 2029,High 2036 Risk level:High,equal as 880 megatons |
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Solutions: - Fragmenting - Nuclear weapons - Spacecraft to collide with the asteroid - Move asteroid slowly over a period of time - Focused solar energy |
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Asteroid (89959) 2002 NT7 Size:2000 metres Possible impact:Low 2019 Risk level:High,wide devastation |
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Designation 2003 UB313 The discovery team (Mike Brown of Caltech, Chad Trujillo of Gemini and David Rabinowitz of Yale) Probably a bit bigger than Pluto Location on discovery:Kuiper Belt |
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Kuiper belt objects(KBOs) Kuiper belt objects (KBOs) has increased to over a thousand,more than 70 000 KBOs over 100 km in diameter are believed to reside there ! |
The analysis of Apophis previews situations likely to be encountered with NEAs yet to be discovered: a close approach that is not dangerous (like Apophis in 2029) nonetheless close enough to obscure the proximity and the danger of a later approach (like Apophis in 2036) by amplifying trajectory prediction uncertainties caused by difficult-to-observe physical characteristics interacting with solar radiation as well as other factors.