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What a sweet shot! I took a similar shot 2 years ago, it's a fun shoot. What is your question about how to process this shot?
As to David's question, the D800 does great at ISO 6400, but the key, like with all star shots is to not to underexpose it too much. Its with the underexposing that noise comes in, so being sure to bump the iso up as needed, like in this case, will help give star shots with minimal noise. The other thing I do is I process the the star shots in ACR, I have found that ACR does a better job with eliminating color noise in dark star shots than Capture NX2 does.