Telescope pointing for GOPEX

Details Telescope pointing for GOPEX Telescope pointing for GOPEX

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993tdar.nasa..230o&link_type=abstract

In its The Telecommunications and Data Acquisition Report p 230-235 (SEE N94-14369 02-32)

Astronomy and Astrophysics

Astronomy

Error Correcting Devices, Galileo Spacecraft, Laser Beams, Pointing Control Systems, Telescopes, Astronomical Catalogs, Cameras, Coordinates, Divergence, Emittance, Photons

Scientific paper

In order for photons emitted by the GOPEX lasers to be detected by Galileo's camera, the telescopes at Table Mountain Observatory and Starfire Optical Range had to be pointed in the right direction within a tolerance less than the beam divergence. At both sites nearby stars were used as pointing references. The technical challenge was to ensure that the transmission direction and the star positions were specified in exactly the same coordinate system; given this assurance, neither the uncertainty in the star catalog positions nor the difficulty in offset pointing was expected to exceed the pointing error budget. The correctness of the pointing scheme was verified by the success of GOPEX.

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