The Solar Grazing Incidence /GRIST/ and Optical /SOT/ Telescopes joint accommodation

Astronomy and Astrophysics – Astronomy

Scientific paper

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Grist (Telescope), Solar Instruments, Spaceborne Telescopes, Spacelab Payloads, Ultraviolet Astronomy, Computer Techniques, European Space Agency, Infrared Astronomy, Pointing Control Systems, Spaceborne Astronomy, Spatial Resolution

Scientific paper

The Grazing Incidence Solar Telescope (GRIST) is being developed by ESA to make spectral observations of the sun with a spatial resolution of 1 arcsec in the extreme ultraviolet region between 90 and 1700 A. The Solar Optical Telescope (SOT), under development with NASA, will operate in the ultraviolet, optical, and infrared region (greater than 1100 A) to study the sun with a resolution of 0.1 arcsec. The proposed combined payload configuration for the two instruments is described, and the problems which must be solved to ensure a successful joint mission are discussed. These problems may be in the form of mechanical limitations, such as the physical size of the telescopes, the center of mass of the payload, and collision avoidance requirements. The computer requirements for the instrument pointing systems to operate simultaneously, and the need to point both instruments to the same sun location within 1 arcsec must also be taken into account. Two attitude-control methods are also considered, which will meet the most efficient operating altitude for both GRIST and SOT: (1) quasi-inertial stabilization and (2) gravity gradient stabilization.

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