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Anyone tried to see what Pleiades look like from side stand point, using Celestia (which is using Hipparkos data)?
Well, they look really elongated along our line of sight. The uncertainty is like 20% or more.
The reasons are the same: Pleiades are just out of range for parallax method, and there are plenty binaries and multiple stars in the cluster.
But once you know the limitations of methods used to acquire stellar distances, all makes sense.
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