STS-114 / ISS Double Sun Transit

From: Gerhard HOLTKAMP (
Date: Sun Jul 31 2005 - 14:48:21 EDT

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    This report comes with a 5-day delay (due to the fact that for some reason it 
    took that long to put respective pictures on the web) - sorry.
    We (a group of 5)	observed the joint transit of Discovery and the ISS in front 
    of the Sun at 10:17:43 UTC (one hour before docking) at position 49°49'51'' 
    N, 8°39'06'' E. At that  time Discovery was 600 ft (183 meters) below the ISS 
    which from our perspective resulted in a 53 arcsec seperation. (It was at 
    that precise moment that they got ready for the photography of the Shuttle 
    underside from the ISS.) The visual experience in our small group varied from 
    clearly seeing the ISS and Discovery to just seeing the ISS to seeing nothing 
    at all. This was due to the fact of the short transit time (0.5 sec) as well 
    as the difference in contrast between the larger ISS and the smaller Shuttle.
    For pictures and (simulated) videos of the event go to, 
    then click the line labeled "Sonderseite".
    Gerhard HOLTKAMP
    Darmstadt, Germany
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