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The practical detection limit for HST is about a visual magnitude of 30 - that sort of number was reached in the ultra-deep field. Assuming that the solar sail kept reasonably stationary for the 100 hours or so of required exposure then we could do a calculation based on that. There is absolutely no need to resolve the object in order to detect it. If you ...

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A back of the envelope calculation: The dimmest objects detectable by the HST have absolute magnitude $\sim30$, or power $3\times10^{-20}\text{W}$. Assuming the sails have an albedo of 1, we have an expression for the power of the returned light of a solar sail at Pluto given by:  \frac{L_\oplus}{D_\text{SP}}\times \frac{A}{D_\text{EP}}= ...

1

From Wikipedia: Current maps [of Pluto] have been produced from images from the Hubble Space Telescope (HST), which offers the highest resolution currently available, and show considerably more detail, resolving variations several hundred kilometres across, including polar regions and large bright spots... The two cameras on the HST used for these maps are ...

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If its a clear night try to find an area away from light polution, wooded area, flat wasteland and then depending on the time of year,but in he winter months its south you will have to look.Look for the 3 stars in a row pretty close to each other, horizontally, it will easier to see in the later hours 11-12 o'clock best so the 3 stars are Orion's Belt. ...

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