PDF documents and files
that have been saved in Adobe Portable Document Format
(PDF). Adobe PDF Reader software is available for free
and supports most all operating systems.
Adobe Reader is installed on your PC then clicking
on a PDF document link will open up the document
in your browser. To download a PDF document, right
click the link and choose the "Save Target As
.." option. This will save the document to your
Debris Assessment Software (DAS) utility will be periodically updated by NASA to reflect the latest understanding of the man-made debris environment in Earth orbit. Users are encouraged to check this page regularly for news and updates, and to report problems with the DAS software to John
makes several improvements in DAS without changing its overall functionality. DAS will run on Microsoft Windows 2000/XP/7.
Run the software to install DAS (this requires administrative privileges)
Create a shortcut or use the Windows Start menu to run DAS:
Start->Programs->DAS 2.0->DAS 2.0.2
Whenever a new solar flux file becomes available, download the file "solarflux_table.txt". Rename the file to "solarflux_table.dat" and place it
in the DAS installed "data" directory (replacing the existing file).
Corrections to the names of 10 items in the included list of DAS materials cause incompatibilities between projects saved
with DAS version 2.0.2 and those saved with previous versions of DAS 2.0. The changes were made to correct typographical
errors and to apply standard nomenclature. The changes affect project files used for reentry survivability analysis (e.g. "reentry.csv"). Please
see the accompanying Release Notes
for the list of changed material names. If necessary, users may use DAS or a simple text editor to change the affected names
in their own "reentry.csv" files.