There's new gamma-ray data for the Moon! It's from the Fermi gamma ray telescope, (also NASA)
From Moon Glows Brighter Than Sun in Images From NASA's Fermi
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The Moon shines brightly in gamma rays as seen in this time sequence from NASA’s Fermi Gamma-ray Space Telescope. Each 5-by-5-degree image is centered ...
note: After two years of no answer, I've decided to answer this myself. Please feel free to answer if you'd like to contribute something further!
Is delay-doppler radar imaging of NEO asteroids possible only if it spins fast enough?
That is correct. This particular technique has very little or no intrinsic spatial resolution in the transverse direction†. ...
This is a great question!
Parallax and stellar positions
To measure an object's parallax assuming no proper motion, we can get by with as few as two images of a foreground (moving) star against a background of several "fixed" stars. We only need enough resolution to make out one star's diffraction (Airy) disk from the other stars with enough precision to ...