[FPSPACE] Unusually high motion during docking?

[Mgr. CSc. Antonín Vítek]

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< 2) The actual docking was spot on in terms of targetting (one of the smallest 
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< post-contact nudges to one side I've seen) - but in terms of rotation, 
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< after initial capture, the spacecraft rotated about 15 - 20 degrees about 
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< what I guess would be called its Z axis? (the axis of the docking probe)

The axes used in coordinate system of ISS and Soyuz are rather complicated:

The direction of the symmetry axis out of the capture cone of passive docking mechanism on FGB module is -Y (Russian segment coordinate system), or +Z (American segment coordinate system).

The direction of the probe of active docking mechanism on Soyuz spacecraft is +Y (crew members are sitting inside with heads heading in the direction of +X axis, +Z axis is in the plane of solar arrays, completing a right-handed coordinate system).
 

  
Mgr. Antonin Vitek, CSc.

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