Fuji XE1's are very cheap 2nd hand now. These are the superior Sony 16mp Exmor sensor which has low noise. I have used one for nightscapes and it almost keeps up with a full frame camera.
As far as control software I don't know. You can certainly use an intervalometer with one.
There is a guy in the US who will mod them quite cheaply. It might end up a tad more than $500 but probably close depending on how cheaply you got the XE1. I think the mod was about US$150 plus shipping both ways.
A modded Canon 550D or 450D or so may well be more practical.
Greg.
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