Potentially Hazardous Asteroids = PHA's

Links

http://www.lpl.arizona.edu/impacteffects/ will calculate the effects of an asteroid or comet crashing to the Earth. It is an interactive page enabling you to input your own data. Try seeing what size crater would form from a direct impact on your nearest town, or a natural feature close to you.

NEODyS provides information and services for all Near Earth Asteroids. Each NEA has its own dynamically generated home page providing information and services, and a search facility puts the information in easy reach.

Tumblingstone An online scientific magazine about Near Earth Asteroids and related topics.

The Spaceguard Central Node is the web site of The Spaceguard Foundation and of the Spaceguard System. This site is freely opened to all people wishing to understand what is being done for observing and tracking Near-Earth Objects (NEOs): asteroids and comets that could represent a threat to the Earth's ecosystem in case of an impact. The Spaceguard Foundation is an international, private organization that groups observers, both professional and amateur, as well as people and organizations with no particular astronomical background who wants to contribute to the activity of the Foundation.

Australian Spaceguard Survey Homepage

http://spaceguard.ias.rm.cnr.it

Spaceguard UK

http://www.arm.ac.uk/home.html

http://www.nearearthobjects.co.uk/

http://neo.planetary.org/

http://cfa-www.harvard.edu/iau/mpc.html

Big Rock

http://www.astro.uu.se/planet/earn/default.htm

http://impact.arc.nasa.gov/index.html

Jet Propulsion Laboratory

Spacewatch

NEAT

LINEAR

http://neo.jpl.nasa.gov/

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