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A BRDF for the VisorSat model of Starlink satellites is described. Theparameter coefficients were determined by least squares fitting to more than10,000 magnitudes recorded by the MMT-9 robotic observatory. The BRDF isdefined in a satellite-centered coordinate system (SCCS) which corresponds tothe physical shape of the spacecraft and to the direction of the Sun. The threeparameters of the model in the SCCS are the elevations of the Sun and of MMT-9along with the azimuth of MMT-9 relative to that of the Sun. The mean VisorSatmagnitude at a standardized distance of 1,000 km is 6.84 and the RMS of thedistribution around that mean is 1.05. After the magnitudes are adjusted withthe BRDF, the RMS reduces to 0.51. The set of MMT-9 observations transformed tothe SCCS is available from the author.

A Bidirectional Reflectance Distribution Function for VisorSat Calibrated with 10,628 Magnitudes from the MMT-9 Database