<h2>AAS 97-178</h2>
<h2>THERMALLY-INDUCED ATTITUDE DYNAMICS OF A SPACECRAFT WITH A  FLEXIBLE BOOM                                                                        </h2>
<h4>  J. D. Johnston and E. A. Thornton, University of Virginia                                                                                                               </h4>
<h2> Abstract </h2>
 Spacecraft have experience attitude disturbances as a result of thermally-induced  structural motions since the early days of the space program.  Thermally-induced  deformations of relatively flexible appendages such as booms, antennae, and solar  arrays may result in significant disturbance torques reacting on the main body of a  spacecraft.  Examples of recent spacecraft experiencing thermally-induced attitude  disturbances include the Hubble Space Telescope, the Ulysses spacecraft and the  REX-II satellite.  This paper investigates attitude dynamics of a simple spacecraft  incorporating the effects of a flexible boom undergoing thermally-induced  vibrations.