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Getting NuSTAR on target: predicting mast motion

Foster, Karl and Madsen, Kristin K. and Miyasaka, Hiromasa and Craig, William W. and Harrison, Fiona A. and Rana, Vikram R. and Markwardt, Craig B. and Grefenstette, Brian W. (2016) Getting NuSTAR on target: predicting mast motion. In: Observatory Operations: Strategies, Processes, and Systems VI. Proceedings of SPIE. No.9910. Society of Photo-Optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 99100Z. ISBN 978-1-5106-0199-4.

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The Nuclear Spectroscopic Telescope Array (NuSTAR) is the first focusing high energy (3-79 keV) X-ray observatory operating for four years from low Earth orbit. The X-ray detector arrays are located on the spacecraft bus with the optics modules mounted on a flexible mast of 10.14m length. The motion of the telescope optical axis on the detectors during each observation is measured by a laser metrology system and matches the pre-launch predictions of the thermal flexing of the mast as the spacecraft enters and exits the Earths shadow each orbit. However, an additional motion of the telescope field of view was discovered during observatory commissioning that is associated with the spacecraft attitude control system and an additional flexing of the mast correlated with the Solar aspect angle for the observation. We present the methodology developed to predict where any particular target coordinate will fall on the NuSTAR detectors based on the Solar aspect angle at the scheduled time of an observation. This may be applicable to future observatories that employ optics deployed on extendable masts. The automation of the prediction system has greatly improved observatory operations efficiency and the reliability of observation planning.

Item Type:Book Section
Related URLs:
URLURL TypeDescription Paper
Foster, Karl0000-0001-5800-5531
Madsen, Kristin K.0000-0003-1252-4891
Miyasaka, Hiromasa0000-0002-8074-4186
Harrison, Fiona A.0000-0003-2992-8024
Rana, Vikram R.0000-0003-1703-8796
Markwardt, Craig B.0000-0001-9803-3879
Grefenstette, Brian W.0000-0002-1984-2932
Additional Information:© 2016 Society of Photo-Optical Instrumentation Engineers (SPIE). 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 (USA).
Group:Space Radiation Laboratory, NuSTAR
Funding AgencyGrant Number
Subject Keywords:NuSTAR, NASA small explorer, X-ray optics, extendable mast, Science Operations, Metrology, mast thermal flexing
Series Name:Proceedings of SPIE
Issue or Number:9910
Record Number:CaltechAUTHORS:20161117-074725282
Persistent URL:
Official Citation:Karl Forster ; Kristin K. Madsen ; Hiromasa Miyasaka ; William W. Craig ; Fiona A. Harrison ; Vikram R. Rana ; Craig B. Markwardt ; Brian W. Grefenstette; Getting NuSTAR on target: predicting mast motion. Proc. SPIE 9910, Observatory Operations: Strategies, Processes, and Systems VI, 99100Z (July 15, 2016); doi:10.1117/12.2231239.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:72090
Deposited By: Ruth Sustaita
Deposited On:17 Nov 2016 18:15
Last Modified:11 Nov 2021 04:55

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