Greenstreet et al. (2012)
NEO Orbital Distribution Model Release


Contact Information:
Sarah Greenstreet (home page)



Model Release Description:

Please reference the paper listed above

"The Orbital Distribution of Near-Earth Objects inside Earth's Orbit"
Greenstreet, S., Ngo, H., and Gladman, B., Icarus, 217, 355-366 (2012)

when using the Greenstreet et al. NEO orbital distribution model.

This data release provides tools which would allow the user to:

  1. Obtain the steady-state orbital distribution of an NEO sample down to a specified H-magnitude limit.
  2. Examine NEO orbital evolutions at 300-year resolution for time scales of 100-200 Myr (available upon request).
  3. Estimate probabilities that a given real NEO comes from a particular NEO source region.
  4. Determine the impact speed distribution for asteroids onto Earth, Venus, or Mercury.


The NEOSSat-1.0 NEO orbital distribution model consists of a set of test particle integrations originating in five NEO source regions:
-the nu6 secular resonance,
-the 3:1 mean-motion resonance,
-the Intermediate Mars Crosser (IMC) population,
-the Outer Main-Belt (OMB) population, and
-the Jupiter Family Comet (JFC) population.
and data extracted and synthesized from these integrations.


Link to NEO Model Release:

NOTE: The link below is to a tarball of the limited version of the Greenstreet et al. (2012) NEO Orbital Distribution Model which does NOT include the ~400 Gb integrations run for 100 Myr -200 Myr sampled at 300-year intervals. The integration output (384 Gbytes) is available upon request.

A README file at the top level of the tarball directory provides a full description of the NEO model release.

Greenstreet et al. (2012) NEO Orbital Distribution Model (Downloadable tarball link)


NEO Model Motivation Project:

Although nothing in this orbital model is tied to the spacecraft, it was constructed due to the need to have an accurate rendering of the a<1 AU NEO orbital distribution, which is the target region for the studies of the NEOSSat space telescope.

NEOSSat (Near-Earth Object Surveillance Satellite, Canadian Space Agency mission)