The Satellite Coincidence Search Engine provides the WWW user with the capability to determine when satellites were or will be over a specified geographic area or within some distance of each other.

The Coincidence Search Engine may be used to search for times when up to four satellites were over or within the same geographic area simultaneously. Searches may be constrained by time, geographic area, and/or distance between the satellites. The output consists of a sequence of text lines listing the date, time, satellite name, and latitude and longitude.

The program uses an archived database of element set data to calculate the orbits, using a model supplied by the Colorado Center for Astrodynamic Research (CCAR). Orbits may be extrapolated for future times, but the accuracy of the orbit decreases as the temporal distance from the last element set increases.

We're sorry, but we are unable to provide users with two-line element sets (TLEs). Most TLEs can be downloaded from Dr. Kelso's site, http://celestrak.com. TLEs for DMSP satellites (except F15) have been declared "sensitive" by the U.S. Government and are not available to the general public.

NASA Information Contact: Michael Goodman, Global Hydrology and Climate Center GHRC Web Curator: GHRC Web Team Last update: Wednesday, 16-Jun-2004 14:47:40 CDT If you have trouble viewing or navigating this page, please contact GHRC User Services. U.S. Government Compliance report.