Where to find orbital data.

NOTE: This page has been superceded by the "Tracking Programs and TLE Resources" page.

Note: Remember to switch your browser to 'Load to Local Disk', or similar, when retrieving the elements from the indicated archives.

There are several locations of recent orbital data to be found about the net. Most often they are in the form of two-line, or Keplerian elements. These data sets detail the orbital parameters for a given satellite at a given time and can be used in a prediction model (such as SPG4) to locate the satellite.

AMSAT, the Radio Amateur Satellite Corporation, have an excellent explanation of the format. Such element sets can be obtained from the following sources:


The SEDS site archives the molczan's element files (includes elements not published by NASA/USSTRATCOM) and Allen Thomson's element files, through August 2000.



Additional pages for obtaining orbital elements can be found at the "Tracking Programs and TLE Resources" page, and the "Satellite Predictions" page.

Link to the "VSO Home Page"

Contact: webmaster@satobs.org