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A photon of wavelength lambda ~1 micron interacting with a dust grain ofradius a_p ~ 1 mm (a "pebble") undergoes scattering in the forward direction,largely within a small characteristic diffraction angle theta_s ~ lambda/a_p ~100". Though mm-size dust grains contribute negligibly to the interstellarmedium's visual extinction, the signal they produce in scattered light may bedetectable, especially for variable sources. Observations of light scattered atsmall angles allows for the direct measurement of the large grain population;variable sources can also yield tomographic information of the interstellarmedium's mass distribution. The ability to detect brilliant pebble halosrequire a careful understanding of the instrument PSF.

Brilliant Pebbles: A Method for Detection of Very Large Interstellar Grains