Asteroid Comet Impact Hazards - Florida International University

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Potentially Hazardous Asteroids Table Of Contents What Is A PHA? PHA Earth Close-Approach Tables PHA Orbital Elements Torino Impact Scale Asteroid 1999 AN10 Asteroid 1997 XF11 Related Websites WHAT IS A PHA? + View the NASA Portal Potentially Hazardous Asteroids (PHAs) are currently defined based on parameters that measure the asteroid's potential to make threatening close approaches to the Earth. Specifically, all asteroids with an Earth Minimum Orbit Intersection Distance (MOID) of 0.05 AU or less and an absolute magnitude (H) of 22.0 or less are considered PHAs. In other words, asteroids that can't get any closer to the Earth (i.e. MOID) than 0.05 AU (roughly 7,480,000 km or 4,650,000 mi) or are smaller than about 150 m (500 ft) in diameter (i.e. H = 22.0 with assumed albedo of 13%) are not considered PHAs. There are currently 747 known PHAs. This ``potential'' to make close Earth approaches does not mean a PHA will impact the Earth. It only means there is a possibility for such a threat. By monitoring these PHAs and updating their orbits as new observations become available, we can better predict the close-approach statistics and thus their Earth-impact threat. To learn more about the Earth impact threat, visit the NASA Ames Asteroid and Comet Impact Hazards site. PHA EARTH CLOSE-APPROACH TABLES Tables (updated daily) are available showing future and past PHA Earth closeapproach data including uncertainties. Earth close-approach tables for all NEOs are also available. More information about the uncertainties used in these tables is available. PHA ORBITAL ELEMENTS The PHA Orbital Elements Table (updated daily) contains data from the latest orbit solutions for each PHA. In addition to standard asteroid osculating elements obtained from orbit solutions using up-to-date data, this table contains perihelion distance (q), aphelion distance (Q), orbital period (P), absolute magnitude (H), and the number and length of the data used in each orbit solution. http://neo.jpl.nasa.gov/neo/pha.html (1 of 2)12/5/2005 4:28:46 PM TORINO IMPACT SCALE
Potentially Hazardous Asteroids Planetary scientists have developed a new means of conveying the risks associated with asteroids and comets that might collide with the Earth. A risk-assessment scale, similar to the Richter scale used for earthquakes, will assign values to celestial objects moving near Earth. The scale will run from zero to 10. An object with a value of zero or one will have virtually no chance of causing damage on Earth; a 10 means a certain global climatic catastrophe. RELATED WEBSITES More Info ● List of the PHAs (IAU: Minor Planet Center) ● Asteroid Observing Services (Lowell Observatory) ● Asteroid and Comet Impact Hazards (NASA Ames Space Science Division) ● Earth Impact Possibilities (NEODys) ● Small Asteroids Encounters List (Sormano Astronomical Observatory) http://neo.jpl.nasa.gov/neo/pha.html (2 of 2)12/5/2005 4:28:46 PM Site Manager: Don Yeomans Webmaster: Ron Baalke Last Updated: NaN undefined NaN
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Asteroid Comet Impact Hazards 12/5/
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Asteroid Comet Impact Hazards: Intr
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Asteroids, Comets and NASA Research
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Torino Impact Scale 12/5/2005 Torin
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Bibliography 12/5/2005 Asteroid and
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Bibliography Solem, and D.G. Rather
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Bibliography University of Arizona
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Bibliography Chicxulub Crater. J. G
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Neo Catalog 12/5/2005 NEO Catalog h
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Unusual Minor Planets Unusual Minor
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Page 347 and 348: THREE STAGES IN METEORITE RESEARCH
Page 349 and 350: THREE STAGES IN METEORITE RESEARCH
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Asteroid Comet Impact Hazards - Florida International University

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