News and Advisories
Frequently Asked Questions
Pointing Information and Science Instrument Aperture Locations
Current operational SI aperture relations in the HST focal plane; positions, scales, orientations.
Information on SIAF file updates.
Discussion and interpretation of observation log or `jitter' files, attitude algorithms, and advice for analyzing pointing.
Plotting tool giving HST roll to put a given aperture at a given position and orientation on the sky.
Calibration Operations and Data
Calibration data from pre-launch to present.
Spectra of HST standards and astronomical databases.
Special CDBS data used for the throughput simulators and Exposure Time Calculators.
Focus and the OTA
Desorption and secondary mirror move history.
Orbital and longer term focus variation.
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22 Apr 1998