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I'm wondering where one can find more or less up-to-date data on the inertia matrix of the ISS. A full historical dataset would be great, of course. A discussion of error margins is desirable.

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ThePlanMan was on the right track. The 'On-Orbit Assembly, Modeling, and Mass Properties Data Book' contains inertia tensors for each assembly step of the ISS.

I haven't found a more recent edition than 2008.

These don't mention error margins. Since mass and dimensions are listed to 1 mm and 1 kg (and not rounded to larger values) I'd expect the error margins to be in the region of 1 kg*mm$^2$.

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