| Palermo Technical Impact Hazard Scale |
Article Index for Palermo |
Limousines in Palermo |
Website Links For Palermo |
Information AboutPalermo Technical Impact Hazard Scale |
| CATEGORIES ABOUT PALERMO TECHNICAL IMPACT HAZARD SCALE | |
| alert measurement systems | |
| scales | |
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The Palermo Scale value, ''P'', is defined as the base 10 logarithm of the ratio of the impact probability ''pi'' to the background impact probability over the time in years T to the event: : The annual background impact frequency is defined for this purpose as: : where the energy threshold E is measured in Megaton s. The near-Earth object was the first near-Earth object detected by NASA 's latest NEO programme to be given a positive rating on the scale of 0.06, indicating a higher than background threat. The value was subsequently lowered after more measurements were taken; 2002 NT7 is no longer considered to pose any risk within the next 100 years. As of March 2006, the record for Palermo scale values is held by asteroid (29075) 1950 DA , with a value of 0.17 for a possible collision in the year 2880 ; second on the list is asteroid 2004 VD17 with −0.25 due to a possible collision in 2102 . For a brief period in late December 2004, asteroid . SEE ALSO EXTERNAL LINKS
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