Figure 9:

a: Simulated LRO Star Tracker image (in pixel space), showing radiation re- ceived from CZL and from singly-scattered sunlight from the surface. The original pixel resolution was increased 10 times to capture subtle topographic features. b: Same as a but adding doubly-scattered light originating from surrounding terrain outside the FOV. c: Same as b after averaging the modeled pixels back to the original image resolution. d: Contour plot of the distance of surface points seen in the image to the spacecraft, for context. e: Spatial map view in cylindrical projection of lunar topography (grayscale) with superposed surface boresight intersection points within the image FOV. That is, we place the lunar surface shown in a–d on a map. The color indicates the level of radiation doubly-scattered to LRO. Note the color scale shows fainter values than in b–c. Black indicates no secondary radiation. f: Same as e, but surface boresight intersections are now all magenta color. The neighboring surfaces contributing doubly-scattered radiation are shown following the color scale (showing the sum of radiation eventually arriving at LRO, through any surface boresight point).