Distance Earth-Saturn: Solving the Doppler Effect

luminether
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I need to find what the distance between Earth and saturn would be if they were both in a straight line with the sun (both on the same side of the sun).

The problem I'm trying to solve involves the doppler effect, and I can work it out if I know that distance. Does anyone know what it is, or where I could look to find out?
 
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Earth's semi-major axis is 1AU and Saturn's semi-major axis is 9.54AU.

So if they were inline on the same side of the Sun, they would be 8.54AU apart, where 1AU is ~1.5E8km.
 
Thanks :smile:
 

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