(Nearby) Occultation Photometry

Use the Moon or (better) a steerable coronagraph on a space
      telescope to slowly cover a system, observe vs. time.

Use different parts of the lunar limb to get different angles.

Must carefully calibrate and remove Fresnel diffraction.

First proposed by Elliot (Direct Imaging of Extra-solar
      Planets with Stationary Occultations Viewed by a Space Telescope,
      1978, Icarus 35:156-164).

Possibly very useful for dust disks.

Why is nobody doing this?