In-flight performance of the Goddard High Resolution Spectrograph of the Hubble Space Telescope

Details In-flight performance of the Goddard High Resolution Spectrograph of the Hubble Space Telescope In-flight performance of the Goddard High Resolution Spectrograph of the Hubble Space Telescope

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991spie.1494....9t&link_type=abstract

IN: Space astronomical telescopes and instruments; Proceedings of the Meeting, Orlando, FL, Apr. 1-4, 1991 (A92-45151 19-89). Be

Astronomy and Astrophysics

Astronomy

2

Absorption Spectra, Hubble Space Telescope, Spectrographs, Stellar Spectra, Target Acquisition, Airborne/Spaceborne Computers, High Resolution, Line Spectra, Optical Measuring Instruments, Spaceborne Astronomy

Scientific paper

The Goddard High Resolution Spectrograph (GHRS) has completed Orbital Verification and is well into the Science Verification phase of its mission. The instrument performance has been flawless, and many significant early science observations have been completed. The GHRS digicon detectors are well calibrated including the determination of operating parameters, detector geometry, and noise sensitivity. Tests using calibration lamps and standard UV stars have confirmed the instrument sensitivity and spectral resolving powers of Lambda/Delta-Lambda = 2000, 20,000, and 90,000. The sensitivity has not changed since the 1984 baseline ground based calibration. The GHRS flight software has been thoroughly tested, and is controlling all instrument observing as expected. Basic target acquisition testing and GHRS alignment calibrations have been successfully completed, and targets are routinely being located within 2-3 arcsecs of the initial pointing. Observations have been successfully performed using both the 2.0 x 2.0 arcsec aperture, and the smaller 0.25 x 0.25 arcsec aperture. The extended point spread function caused by the spherical aberration of the HST primary mirror has been well measured, and observing methods to deal with it have been developed. The aberrated image allows approximately 70 percent of the total energy into the large science aperture, and 15 percent of the total energy into the smaller aperture. Numerous science assessment observations of interesting astronomical targets have been completed, and indicate the extreme usefulness of the GHRS to the scientific community.

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