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Proceedings Paper

Commissioning of the cosmic origins spectrograph on the Hubble Space Telescope: an overview of COS servicing mission observatory verification
Author(s): David J. Sahnow; Charles D. Keyes; Thomas B. Ake; Alessandra Aloisi; Stéphane Béland; Carl P. Biagetti; Eric B. Burgh; George Chapman; Thomas Delker; Kevin France; Scott D. Friedman; Cynthia S. Froning; Parviz Ghavamian; Paul Goudfrooij; James C. Green; George F. Hartig; Philip E. Hodge; Daniel Lennon; Derck Massa; Jason B. McPhate; Sami-Matias Niemi; Cristina Oliveira; Rachel Osten; Steven N. Osterman; Steven V. Penton; Merle Reinhart; Brittany Shaw; T. Ed Smith; David R. Soderblom; Alan Welty; Thomas P. Wheeler; Brian R. York; Wei Zheng
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Paper Abstract

The Cosmic Origins Spectrograph (COS) was installed into the Hubble Space Telescope (HST) during Servicing Mission 4 (SM4) in May 2009. COS is designed to obtain spectra of faint objects at moderate spectral resolution (R > 16,000) in two channels: FUV, covering wavelengths from 1150 to 1450 Å; and NUV, covering 1700 - 3200 Å. Two low resolution gratings (R > 1500) cover the < 900 - 2050 Å (FUV) and 1650 - 3200 Å (NUV) wavelength regions. An imaging capability is also available on the NUV channel. As part of the Hubble Servicing Mission Observatory Verification (SMOV) program, an extensive period of checkout, fine-tuning and preliminary characterization began after the installation of COS. The COS SMOV program was a cooperative effort between the Space Telescope Science Institute and the Instrument Definition Team based at the University of Colorado. Nearly 2800 COS exposures in 34 separate observing programs were obtained during the course of SMOV. Early activities included an initial instrument functional checkout, turn-on and initial characterization of the detectors, NUV and FUV channel focus and alignment, and target acquisition verification and assessment. Once this initial period was completed, science-related calibrations and verifications were performed in order to prepare the instrument for normal science operations. These activities included wavelength calibration, flux calibration, detector flat field characterization, spectroscopic performance verification, high S/N operation, and thermal and structural stability measurements. We discuss the design, execution and results of the SMOV program, including the interrelationships between the various tasks, and how the pre-launch plan was adjusted in real-time due to changing conditions.

Paper Details

Date Published: 10 August 2010
PDF: 14 pages
Proc. SPIE 7731, Space Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave, 773139 (10 August 2010); doi: 10.1117/12.858058
Show Author Affiliations
David J. Sahnow, The Johns Hopkins Univ. (United States)
Charles D. Keyes, Space Telescope Science Institute (United States)
Thomas B. Ake, Space Telescope Science Institute (United States)
Alessandra Aloisi, Space Telescope Science Institute (United States)
Stéphane Béland, Univ. of Colorado at Boulder (United States)
Carl P. Biagetti, Space Telescope Science Institute (United States)
Eric B. Burgh, Univ. of Colorado at Boulder (United States)
George Chapman, Space Telescope Science Institute (United States)
Thomas Delker, Ball Aerospace & Technologies Corp. (United States)
Kevin France, Univ. of Colorado at Boulder (United States)
Scott D. Friedman, Space Telescope Science Institute (United States)
Cynthia S. Froning, Univ. of Colorado at Boulder (United States)
Parviz Ghavamian, Space Telescope Science Institute (United States)
Paul Goudfrooij, Space Telescope Science Institute (United States)
James C. Green, Univ. of Colorado at Boulder (United States)
George F. Hartig, Space Telescope Science Institute (United States)
Philip E. Hodge, Space Telescope Science Institute (United States)
Daniel Lennon, Space Telescope Science Institute (United States)
Derck Massa, Space Telescope Science Institute (United States)
Jason B. McPhate, Space Sciences Lab., Univ. of California, Berkeley (United States)
Sami-Matias Niemi, Space Telescope Science Institute (United States)
Cristina Oliveira, Space Telescope Science Institute (United States)
Rachel Osten, Space Telescope Science Institute (United States)
Steven N. Osterman, Univ. of Colorado at Boulder (United States)
Steven V. Penton, Univ. of Colorado at Boulder (United States)
Merle Reinhart, Space Telescope Science Institute (United States)
Brittany Shaw, Space Telescope Science Institute (United States)
T. Ed Smith, Space Telescope Science Institute (United States)
David R. Soderblom, Space Telescope Science Institute (United States)
Alan Welty, Space Telescope Science Institute (United States)
Thomas P. Wheeler, Space Telescope Science Institute (United States)
Brian R. York, Space Telescope Science Institute (United States)
Wei Zheng, The Johns Hopkins Univ. (United States)


Published in SPIE Proceedings Vol. 7731:
Space Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave
Jacobus M. Oschmann; Mark C. Clampin; Howard A. MacEwen, Editor(s)

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