When you say "culled", do you mean that it just doesn't appear on screen, or are you actually testing to see if OSG is culling it?
If the first, then it might be that your projection matrix puts the EphemerisModel at a depth larger than 1, hence it is not displayed. Options might be to allow OSG to compute your near/far values itself, or, if this isn't good enough, look at techniques similar to DepthPartitionNode (which is what I ended up doing).
Hope that helps,
David
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