00000nam 2200000zi 4500 9.895006 CaOODSP 20221107173913 m o d f cr bn||||||||| 210104e198202 onca obt f000 0 eng d CaOODSP eng rda CaOODSP Co24-3/7-1354-1982E-PDF Vigneron, F. R., author. The attitude dynamics of Hermes after termination of three-axis stabilization / by F.R. Vigneron and W.E. Krag. Ottawa : Communications Research Centre, February 1982. 1 online resource (iii, 25 pages) : illustrations. text txt rdacontent computer c rdamedia online resource cr rdacarrier CRC report ; no. 1354 "Space Technology and Applications Branch." Digitized edition from print [produced by Innovation, Science and Economic Development Canada]. Some pages rotated in this copy. Includes bibliographical references (page 15). "In late 1979, Hermes, an experimental geostationary communications satellite, experienced an earth sensor malfunction which resulted in its loss of control and subsequent transition from 3-axis stabilization to spin about its maximum-moment-of-inertia axis. During and after the transition, the sun's reflections from the satellite were detected and monitored at the experimental test site (ETS) for the Ground Based Electro Optical Deep Space Surveillance System (GEODSS) in New Mexico. In this report, the satellite's attitude dynamics are deduced by correlating the GEODSS ETS observations with dynamics analysis and simulation. The transition to spin took about 15 days. Thereafter, the rate of spin decayed to zero in about 70 days due to solar pressure. The GEODSS ETS observations also provide data on the relative misalignment and bending of the two solar sails of the satellite"--Abstract, page 1. Issued also in print format. Hermes (Communications satellite) Artificial satellites Attitude control systems. Artificial satellites Stability. Hermes (Satellite de télécommunications) Satellites artificiels Systèmes de commande d'orientation. Satellites artificiels Stabilité. Communications Research Centre (Canada), issuing body. CRC report ; no. 1354. (CaOODSP)9.882492 PDF 1.48 MB https://publications.gc.ca/collections/collection_2021/isde-ised/co24/Co24-3-7-1354-1982-eng.pdf