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Reconstruction of the NuSTAR PSF Using Single-laser Metrology

Earnshaw, Hannah P. and Madsen, Kristin K. and Forster, Karl and Grefenstette, Brian W. and Brightman, Murray and Zoglauer, Andreas and Harrison, Fiona (2022) Reconstruction of the NuSTAR PSF Using Single-laser Metrology. In: 2022 IEEE Aerospace Conference (AERO). IEEE , Piscataway, NJ, pp. 1-8. ISBN 978-1-6654-3760-8.

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This paper describes a method by which the metrology system of the Nuclear Spectroscopic Telescope Array (NuSTAR) X-ray space observatory, which uses two lasers to characterize the relative motion of the optics and focal plane benches, can be approximated if one laser fails. The optics and focal plane benches are separated by a ten-meter-long rigid mast that undergoes small amounts of thermal flexing depending on how the spacecraft is illuminated by the Sun. Compensation for this motion is required in order to produce an in-focus image. We analyze the trends of mast motion by observation parameters, using archival NuSTAR data between 2012 and 2021, in order to discover whether parameters such as the solar aspect angle (SAA) can be used to predict the mast motion in future observations. We find that, by using the SAA, observation date, and orbital phase, we can simulate the motion measured by one of the lasers by translating the track produced by the other laser and applying modifications to the mast aspect solution calculated during the NuSTAR data reduction pipeline. With this simulated mast solution, we are able to reconstruct a minimally distorted point spread function for all but two narrow ranges of SAA. We plan to implement the generation of simulated mast files alongside the usual NuSTAR data reduction pipeline for contingency purposes should a laser on the spacecraft fail in the future. This work also has implications for reducing the risk of implementing laser metrology systems on future missions that use deployable masts to achieve the long focal lengths required in high-energy astronomy.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Earnshaw, Hannah P.0000-0001-5857-5622
Madsen, Kristin K.0000-0003-1252-4891
Forster, Karl0000-0001-5800-5531
Grefenstette, Brian W.0000-0002-1984-2932
Brightman, Murray0000-0002-8147-2602
Zoglauer, Andreas0000-0001-9067-3150
Harrison, Fiona0000-0003-2992-8024
Additional Information:© 2022 IEEE. This work was supported under NASA Contract No. NNG08FD60C and made use of data from the NuSTAR mission, a project led by the California Institute of Technology, managed by the Jet Propulsion Laboratory, and funded by the National Aeronautics and Space Administration. We thank the NuSTAR Operations, Software, and Calibration teams for support with the execution and analysis of these observations. This research has made use of the NuSTAR Data Analysis Software (NuSTARDAS) jointly developed by the ASI Science Data Center (ASDC, Italy) and the California Institute of Technology.
Group:Astronomy Department, Space Radiation Laboratory, NuSTAR
Funding AgencyGrant Number
Record Number:CaltechAUTHORS:20220811-935515000
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:116246
Deposited By: George Porter
Deposited On:15 Aug 2022 15:17
Last Modified:15 Aug 2022 15:17

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