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NASA/JPL NEO Deflection App

Welcome to the initial release of the NASA/JPL NEO Deflection App (NDA), a web-based interactive tool produced in collaboration with the Aerospace Corporation. This app is designed to provide insight into the problem of deflecting a threatening asteroid impulsive asteroid deflection, with special emphasis on using a Kinetic Impactor (KI) mission. Given a simulated asteroid on an Earth impact trajectory, the app can answer such questions as:

  • What are the best times to deflect the asteroid?
  • How much velocity change is required to make the asteroid miss the Earth?
  • When could an impactor spacecraft be launched in order to intercept the asteroid?
  • What is the maximum size of asteroid that can be deflected with a single launch?
  • In which direction will the asteroid be deflected most easily?

The app has been pre-loaded with the hypothetical asteroid "2015 PDC" created for the impact scenario to be discussed at the 2015 Planetary Defense Conference, April 13-17, 2015, in Frascati, Italy. Over a dozen other simulated impacting asteroid trajectories are also available for study.

Note: The objects loaded into this app are not real: they are all hypothetical, simulated asteroids. The trajectories and deflection calculations, however, use entirely realistic mathematical models.

Start the NEO Deflection App:

Get a quick overview of the app:

Take a detailed tour of the app using the 2015 PDC scenario:


Development of the NEO Deflection App was sponsored by NASA's Planetary Science Division, Science Mission Directorate, was led by the NEO Program Office at the Jet Propulsion Laboratory (JPL), and was implemented by The Aerospace Corporation (TAC). Don Yeomans (JPL) defined the requirements and provided overall guidance in this project; Paul Chodas (JPL) designed the hypothetical cases, numerically integrated the trajectories, and generated the coefficient tables that are pre-loaded into the app; and Nahum Melamed (TAC) led the Aerospace systems engineering team that designed, developed and verified the app and its web interface.

Team members involved in the project were:
JPL: Don Yeomans, Paul Chodas, Alan Chamberlin, Steve Chesley, Jon Giorgini, and Damon Landau.
The Aerospace Corporation: Nahum Melamed, Jason Anderson, Jason Stout, Eyal Amir and Bill Ailor.

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