Debris Assessment Software
The Debris Assessment Software (DAS) utility provides data that can verify compliance of a spacecraft, upper stage, and/or payload with NASA's requirements for limiting debris generation, spacecraft vulnerability, postmission lifetime, and entry safety. Successful verification of a design in DAS demonstrates compliance with NASA debris mitigation requirements. Historically, DAS analysis has proven acceptable in meeting compliance requirements of many other agencies in the U.S. and around the world. It does not address the inherent design reliability facets of NASA requirements, but addresses all Earth-related orbital debris requirements that make up the bulk of the requirements in the NASA Technical Standard 8719.14B.
DAS 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 N. Opiela.
DAS 3.1.0 made several improvements in DAS, most notably updating the orbital debris environment model from ORDEM 3.0 to ORDEM 3.1. The Grün meteoroid flux model has been removed from the assessment of small-object penetration probability (Requirement 4.5-2). Probability of small-object penetration due to meteoroids must be assessed outside DAS at this time. Please contact the NASA Meteoroid Environment Office (William Cooke) and Hypervelocity Impact Technologyteams for guidance on meteoroid assessments.
The current version of DAS is 3.1.2. DAS 3.1.2 is optimized for Microsoft Windows 10.
Although approved for public release, NASA regulations require that a Software Usage Agreement must be obtained to acquire a copy of the NASA-developed software, DAS. To begin the process, please press the Request Now! button in the Software Catalog. Included in the installer and also available for separate download are the DAS User's Guide and Software Release Notes.
Click here to download the latest DAS Solar Flux table • Updated 6/28/2021
- Request DAS and complete the Software User Agreement.
- Download and run the DAS Software Installer.
- Whenever a new solar flux file is released (quarterly), download the file solarflux_table.txt from this page. The file date is in the header information. Place the file in the DAS installed data\ directory, replacing the existing file. You may rename the file to solarflux_table.dat, but this is not required for DAS 3.0.1 or later versions.