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700-1000 is right up in the IR band. Depending on star brightness it should be quite short exposures, several seconds to maybe 10-20 at ISO1600.
It will also be affected by local 'seeing', skyquality and light pollution so an exact number would have to be experimented for.
Most modern DSLR cameras are highly IR sensitive once the IR cut filter is removed and have high ISO's and low noise. SONY chips appear to be used for a lot of dedicated astro cameras, very low noise and very sensitive. I think Nikon use SONY sensors, you would have to check the specs.
I occaisonally use my SONY SLT A77v @ 24 megapixel but not IR modded. Still gets some amazing detail.
When you say 'distances between stars' are you talking angular distances or actual LY distances spatially ? I am unsure as to how you would expect LY distance could be measured using a DSLR and computer.
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