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Target acquisition for multi-object spectroscopy with JWST NIRSpec
Author(s): Charles D. Keyes; Tracy L. Beck; Maria Peña-Guerrero; Catarina Alves de Oliveira; Pierre Ferruit; Peter Jakobsen; Giovanna Giardino; Marco Sirianni; Torsten Boeker; Stephan Birkmann; Charles Proffitt
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Paper Abstract

NIRSpec is the flagship spectrograph for JWST in the 0.6 to 5.3 micron wavelength range. Observation with the Micro- Shutter Assembly (MSA) for multiobject spectroscopy (MOS) will use configurable shutters to form spectral slits and provide the first space-based MOS capabilities. The NIRSpec Micro-shutter Assembly Target Acquisition (MSATA) is an autonomous target acquisition scheme to acquire and position targets accurately with respect to the spectral slits. The method uses measured centroid positions of reference stars with accurately known relative positions across the target field for this process. MSATA performs not only linear offsets, but any required telescope orient (roll) correction to remove blind-pointing alignment error. The MSATA procedure can be used for most NIRSpec science and will be a prerequisite for most NIRSpec MOS mode observations. Astrometry relating the positions of science targets and candidate reference stars with a relative accuracy of 5 - 10 mas will be needed to deliver the best calibration accuracy of science sources. With this level of planning accuracy, the MSATA procedure should yield a final total pointing accuracy for NIRSpec MOS targets of <20 mas within the preselected 200 mas-wide MSA shutter. Here we present analysis of test cases using simulated datasets that were used to help define and check operations flow for NIRSpec MSATA.

Paper Details

Date Published: 10 July 2018
PDF: 16 pages
Proc. SPIE 10704, Observatory Operations: Strategies, Processes, and Systems VII, 107041J (10 July 2018); doi: 10.1117/12.2313712
Show Author Affiliations
Charles D. Keyes, Space Telescope Science Institute (United States)
Tracy L. Beck, Space Telescope Science Institute (United States)
Maria Peña-Guerrero, Space Telescope Science Institute (United States)
Catarina Alves de Oliveira, European Space Agency (United States)
Pierre Ferruit, European Space Agency (Netherlands)
Peter Jakobsen, Univ. of Copenhagen (Denmark)
Giovanna Giardino, ATG (Netherlands)
Marco Sirianni, European Space Agency (United States)
Torsten Boeker, European Space Agency (United States)
Stephan Birkmann, European Space Agency (United States)
Charles Proffitt, Space Telescope Science Institute (United States)


Published in SPIE Proceedings Vol. 10704:
Observatory Operations: Strategies, Processes, and Systems VII
Alison B. Peck; Robert L. Seaman; Chris R. Benn, Editor(s)

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