Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992esasp.354..247l&link_type=abstract
In ESA, Targets for Space-Based Interferometry p 247-250 (SEE N93-31750 12-89)
Astronomy and Astrophysics
Astronomy
1
Astrometry, Astronomical Interferometry, Hipparcos Satellite, Interferometers, Spaceborne Astronomy, Design Analysis, Optical Measuring Instruments, Systems Engineering, Trusses
Scientific paper
The concepts of several interferometers, which can be built inside a tubular truss and be used according to the principle of the Hipparcos satellite, are described. Measuring the apparent angular spacing of star pairs, as required for wide angle astrometry, has been achieved by either pointing the stars sequentially or observing pairs of them simultaneously. The first method requires accurate divided circles on the instrument's mount, a stable pier carrying the instrument, and a good knowledge of the pier's diurnal rotation. The second method requires an internal prism or roof mirror system with fixed and known angle. An advantage in this case is that the instrument's pointing direction does not have to be accurately known. There is no need for a stable pier with known diurnal rotation. The Hipparcos satellite gave a successful illustration of the second method. The principle of the Hipparcos satellite, namely the measurement of angular distances between pairs of stars seen in different directions, has proved suitable for determining stellar positions with excellent accuracies. The extension of this principle to deployable space frames carrying optical elements which can observe simultaneously in a number of directions is also considered.
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