Science observations with the IUE using the one-gyro modeThe International Ultraviolet Explorer (IUE) attitude control system originally included an inertial reference package containing six gyroscopes for three axis stabilization. The science instrument includes a prime and redundant Field Error Sensor (FES) camera for target acquisition and offset guiding. Since launch, four of the six gyroscopes have failed. The current attitude control system utilizes the remaining two gyros and a Fine Sun Sensor (FSS) for three axis stabilization. When the next gyro fails, a new attitude control system will be uplinked, which will relay on the remaining gyro and the FSS for general three axis stabilization. In addition to the FSS, the FES cameras will be required to assist in maintaining fine attitude control during target acquisition. This has required thoroughly determining the characteristics of the FES cameras and the spectrograph aperture plate as well as devising new target acquisition procedures. The results of this work are presented.
Document ID
19930039450
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Imhoff, C. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Pitts, R. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Arquilla, R. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Shrader, C. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Perez, M. (IUE Observatory; NASA, Goddard Space Flight Center Greenbelt, MD, United States)
Webb, J. (Computer Sciences Corp. Lanham, MD, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1990
Publication Information
Publication: In: Observatories in earth orbit and beyond (A93-23401 07-89)