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Asteroids - Dynamic Site
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NEODyS
Our service for Near Earth Objects.
The International Astronomical Union home page
Starting point to reach a wealth of information about the IAU, its organisation, officers, scientific and administrative activities, memembership, etc.
The International Astronomical Union Division A: Fundamental Astronomy
Home page of the IAU Division A. This Division provides a focus for astronomers studying a wide range of problems related to fundamental physical phenomena such as time, the inertial reference frame, positions and proper motions of celestial objects, and precise dynamical computation of the motions of bodies in stellar or planetary systems in the Universe. C.A4 - Inter-Division A-F Commission Celestial Mechanics and Dynamical Astronomy belongs to this division.
The International Astronomical Union Division F: Planetary Systems and Bioastronomy
Division F gathers astronomers engaged in the study of a comprehensive range of phenomena in the solar system and its bodies, from the major planets via comets to meteorites and interplanetary dust. C.F1 - Division F Commission F1 Meteors, Meteorites, and Interplanetary Dust, Division F Working Group Near Earth Objects, Division F Working Group Small Bodies Nomenclature (SBN), C.X2 - Cross-Division A-F Commission Solar System Ephemerides belong to this division.
The Minor Planet Center
This is the center designated by the IAU as the clearing house for astrometric observations. The MPC is responsible for receiving, checking, and disseminating the observations.
ESA SSA-NEO Coordination Center
The ESA SSA-NEO Coordination Center is the European Space Agency Center for the Segment NEO of the Space Situational Awareness program. It is located at ESRIN (Frascati, Italy).
NASA's NEO Program site at Jet Propulsion Laboratory
Another good introduction to NEO's. This site is written for the layman, so it has a highly accessible description of the problem and what is being done about it. Includes an excellent listing of future encounters with Potentially Hazardous Asteroids, as well as the Risk Page provided by the complementary JPL's impact monitoring system, Sentry.