About 34 meters in diameter!

The landing platform is about 5 meters across.

It would subtend an angle of 0.003 arcseconds from Earth.

You would need an orbiting optical telescope with an effective aperture of 34 meters.

This comes from the formula 1.22 x 206265 x (wavelength/diameter) = angular resolution in arcseconds.

where the wavelength is about 0.5 Angstroms and the angular size is 0.003 arcseconds.

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