SEE PRODUCTS / SEE Related Model & DB -
Meteoroid and
Orbital Debris
ORDEM-2K
Description:
A semi-empirical, computer-based orbital-debris model has
been developed which combines direct measurements of the
environment with the output and theory of more complex
orbital-debris models. It approximates the environment with
six different inclination bands. Each band has a unique
distribution of semi-major axis, for near circular orbits, and
a unique perigee distribution, for highly elliptical orbits.
In addition, each inclination band has unique size
distributions which depend on the source of debris. Collision
probability equations are used to relate the distributions of
orbital elements to flux on a spacecraft or through the field
of view of a ground sensor. The distributions of semi-major
axis, perigee, and inclination are consistent with the U.S.
Space Command catalogue for sizes larger than about 10 cm,
taking the limitations of the sensors into account. For
smaller sizes, these distributions are adjusted to be
consistent with the flux measured by ground telescopes, the
Haystack radar, and the Goldstone radar as well as the flux
measured by the LDEF satellite and the Space Shuttle. The
computer program requires less than one (1) second to
calculate the flux and velocity distribution for a given size
debris relative to an orbiting spacecraft.
Additional Information:
Language: binary executable
Operating System: Intel based
computers only
Hardware Requirements: No special
requirement
Availability:
- Maintenance/ Upgrades: Unknown
- Source Code: No
- Cost: None
- Distribution:
- Training: None
Input Description: Inputs are time in terms of calendar
year, the solar activity in the year previous to the time, the limiting particle
diameters, the altitude and the inclination of the
spacecraft's orbit or the latitude of the fixed point.
Output Description: Flux, average velocity, velocity
distribution, size, velocity, and angular distribution. All data are given in terms of
cross-sectional data
Point of Contact:
Nicholas Johnson
NASA Johnson Space Center
Houston, Texas 77058
Phone: 281-483-5313
E-mail:
nicholas.l.johnson1@jsc.nasa.gov
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