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This paper describes a method by which the metrology system of the NuclearSpectroscopic Telescope Array (NuSTAR) X-ray space observatory, which uses twolasers to characterize the relative motion of the optics and focal planebenches, can be approximated should one laser fail. The two benches areseparated by a ten-meter-long rigid mast that undergoes small amounts ofthermal flexing which need to be compensated for in order to produce anon-blurred image. We analyze the trends of mast motion by archival observationparameters in order to discover whether the mast motion in future observationscan be predicted. We find that, by using the solar aspect angle (SAA),observation date, and orbital phase, we can simulate the motion of one laser bytranslating the track produced by the other and applying modifications to theresulting mast aspect solution, allowing the reconstruction of a minimallydistorted point spread function in most cases. We will implement the generationof simulated mast files alongside the usual NuSTAR data reduction pipeline forcontingency purposes. This work has implications for reducing the risk ofimplementing laser metrology systems on future missions that use deployablemasts to achieve the long focal lengths required in high-energy astronomy bymitigating the impact of a metrology laser failure in the extended phase of amission.

Reconstruction of the NuSTAR point spread function using single-laser metrology