Attitude and Exposure Corrections of FIMS Data

Details Attitude and Exposure Corrections of FIMS Data Attitude and Exposure Corrections of FIMS Data

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jass...21..399s&link_type=abstract

Journal of Astronomy and Space Sciences. Vol. 21, no. 4, 399-416

Astronomy and Astrophysics

Astronomy

1

Space-Based Ultraviolet Telescopes, Attitude Correction, Exposure Correction, Fims

Scientific paper

The FIMS (Far-ultraviolet IMaging Spectrograph), the main payload onboard the first Korean science satellite STSAT-1, has performed various observations since its launch on September 2003. It has been found that the attitude informations provided by spacecraft bus system have a time offset problem, and the problem has been extensively studied. After the time offset correction, boresight offsets between FIMS fields of view, of long and short wavelength bands, respectivley, and spacecraft attitude systems, which are mainly due to alignment error between the FIMS and spacecraft mechanical systems, were calculated through the observations of well known calibration targets. Monthly status and precision of the attitude information are also described. Correction methods for spatially variable exposure, intrinsic to FIMS data, are discussed. These results are essential to the FIMS data analysis, and will be used as references for subsequent studies on more accurate attitude corrections.

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