An appraisal of the optical properties of a satellite metrological sensor, Advanced Very High Resolution Radiometer (AVHRR), is made for a proposed orbital trajectory which results in an unexpected solar straylight path; i.e., bypassing the external scan mirror and Cassegrain telescope, and proceeding directly to the inner conical baffle. This straylight path is directed onto an internal beamsplitter which, in turn, is directly observed by the detectors. Stray light analysis, as a goal, seeks to remove or minimize the influence of such critical scattering paths. This particular straylight path is evaluated using a standard optical ray tracing program, ACCOS V, and represents an uncommon approach to straylight analysis. To determine the expected sensor degradation, a calculation of the expected attenuation coefficient of scattered sunlight in the AVHRR sensor is estimated based on this important critical scattering path.