The fraction of close binaries among Hubble Space Telescope guide stars - Operational consequences, workarounds, and suggestions for designers of future space observatories

Details The fraction of close binaries among Hubble Space Telescope guide stars - Operational consequences, workarounds, and suggestions for designers of future space observatories The fraction of close binaries among Hubble Space Telescope guide stars - Operational consequences, workarounds, and suggestions for designers of future space observatories

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pasp...99..223s&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 99, March 1987, p. 223-233.

Astronomy and Astrophysics

Astronomy

7

Astronomical Catalogs, Binary Stars, Guidance Sensors, Hubble Space Telescope, Ultraviolet Astronomy, Astrometry, Dwarf Stars, Giant Stars, Memory (Computers), Speckle Interferometry, Stellar Luminosity

Scientific paper

It is observationally determined that a significant number of guide stars which will be used by the Hubble Space Telescope are close binaries which can prevent a Fine-Guidance-Sensor fine lock. This is because the Fine Guidance Sensors (FGSs) operate as white-light interferometers, and the fringe patterns of binaries will result in a reduction in the loop gain in the FGS control system. Consequently, multiple guide stars must be attempted to ensure a successful acquisition. The limited HST on-board computer memory may restrict the number of guide stars which can be attempted, resulting in a possible loss of several hundred hours per year of observing time. The FGSs of the next-generation (and presumably larger) space-telescopes would be even more susceptible to the binary problem. Other types of guidance systems (such as quadrant detectors) deserve serious consideration for future space observatories.

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