satellite temaparature

Yes, it is performed by software. We use Thermal Synthesizer System (TSS) from Space 3D (http://www.spacedesign.com) and Thermal Desktop from Cullimore and Ring (http://www.crtech.com). I don't know if there are export restrictions on these.

You can get an orbital average from the average angle to normal of the sun to your radiators and Q=a/eT^4, where Q is the heat flux for that time of year. That information should be available in the book the previous person noted or even online.

Regards,

Vince