Juergen Oberst 
  
  
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(1a, b) 
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Fig. 4: Typical star image (starcl131) obtained by the MICAS CCD with two different stretches (left and right) being 
(3a, b) applied. The box at the lower left of the right image shows a magnified area around one of the stars, used as a "mask" 
for matching (see text for details). Scattered light problems make the firm identification of stars often difficult. 
mprises 20 Distinct star signatures as in this image actually help in the automated star position measurements. 
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Fig. 5: Section of a star chart showing the positions of the images (right) starcl131 (see Fig. 4) and (left) nav04309. 
The stars mark the upper-left corner of the images. Note that MICAS images are mirrored! For that reason, the right 
show 10-30 
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9; Roser et 
the image ascensions are plotted to increase from left to right, opposite from what the naked eye would see in the sky. 
  
  
International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B1. Amsterdam 2000.