Overview

Torino asteroid and comet impact hazard scale


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Torino level Category Description

0 No hazard (white zone) Zero likelihood of a collision

1 Normal (green zone) Routine discovery in which a pass near the Earth is predicted, but the chance of collision is extremely unlikely

2 Meriting attention by astronomers (yellow zone) Discovery of an object making a close but not highly unusual pass near the Earth, with an actual collision very unlikely

3 Close encounter, with a 1% or greater chance of collision capable of localized destruction

4 Close encounter, with a 1% or greater chance of collision capable of regional devastation

5 Threatening (orange zone) Close encounter that poses a serious but still uncertain threat of regional devastation

6 Close encounter by a large object which poses a serious but still uncertain threat of global catastrophe

7 Very close encounter by a large object, which (if occurring within 100 years) poses an unprecedented but still uncertain threat of a global catastrophe

8 Certain collisions (red zone) Collision is certain, capable of causing localized destruction

9 Collision is certain, capable of causing unprecedented regional devastation

10 Collision is certain, capable of causing global climatic catastrophe

From A Dictionary of Environment and Conservation in Oxford Reference.

Subjects: Environmental Science.



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