Research and Advocacy Organizations

Center for Near Earth Object Studies - NASA's center for computing asteroid and comet orbits and their odds of Earth impact
NASA Planetary Defense Coordination Office - NASA's office for coordinating a US government response to an actual impact threat
Planetary Science Institute - private, nonprofit corporation dedicated to solar system exploration and research
Lunar and Planetary Institute - research organization for lunar and planetary science
University of Arizona's Lunar and Planetary Laboratory - academic organization dedicated to solar system research
Spaceguard Foundation - collection of observatories worldwide that are engaged in near earth object observation
Asteroid Day - organization behind Asteroid Day (June 30th), an ongoing global awareness campaign addressing asteroid impact risks
B612 Foundation - organization devoted to protecting Earth from asteroid impacts
International Asteroid Warning Network - UN-sanctioned organization of experts that study asteroids and communicate threats

Information Databases About Asteroids

Minor Planet Center - IAU identification, designation, and orbit calculations
Near Earth Object Dynamic Site - information and services for all near earth asteroids
European Asteroid Research Node - database of physical and dynamic properties of near earth objects
Jet Propulsion Lab Solar System Dynamics - orbits, physical characteristics, and discovery circumstances for most solar system objects
Asteroid Radar Research - central site for NASA's radar observations of asteroids
Database of Asteroid Models from Inversion Techniques - database of asteroid models and computer visualization
Asteroid/Comet Connection - published astrometry news, tracking, and risk tables on solar system small bodies

Tools and Analytics

Orbit Reconstruction, Simulation and Analysis - site with many asteroid visualization and analytics tools
NASA Ames Research Center Trajectory Browser - search engine, a visualizer, and mission summaries for designing trajectories to planets and small bodies
WorldWide Telescope - interactive visualization software for touring the known universe