Exposure Time Analysis for Far-Ultraviolet Imaging Spectrograph All-Sky Survey Mission

Details Exposure Time Analysis for Far-Ultraviolet Imaging Spectrograph All-Sky Survey Mission Exposure Time Analysis for Far-Ultraviolet Imaging Spectrograph All-Sky Survey Mission

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jass...18..209p&link_type=abstract

Journal of Astronomy and Space Science, vol. 18, no. 3, p. 209-218

Astronomy and Astrophysics

Astronomy

All-Sky Survey, Exposure Time, Observational Scheduling

Scientific paper

Global exposure time distribution through all-sky survey, one of main science missions of KAISTSAT-1, has been simulated. Exposure time distribution has its minimum on the celestial equator and increases with moving to polar regions according to the present mission operation scenario. SAA (South Atlantic Anomaly) and the moon can make further decreases of exposure time around the celestial equator. Effects of SAA on all-sky survey exposure time can be compensated with a simple observational scheduling, orbit exchange between orbits allocated to all-sky survey passing through the SAA region and ones allocated to upper atmosphere observations not affected by SAA. It, however, seems that present exposure time distribution is not adequate for the concrete study of the evolution of interstellar medium. A scheme for active time allocation is needed for redistribution of exposure times weighted around the celestial poles, and additional studies on the advanced mission operation and the observational scheduling are also needed.

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