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Present and Past Space Programs

Published online by Cambridge University Press:  12 April 2016

Karl D. Rakos
Karl D. Rakos*
Affiliation:
Institute for Astronomy, University of Vienna, Austria

Extract

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The increase in accuracy of astrometric results has been very limited in the last half century, and improvements of more than about a factor of 3 at best for ground-based observations are not expected for the next two decades. This is largely due to well known error-sources connected with the Earth atmosphere. By moving the observing equipment to a platform aboard a satellite many of these errors would disappear completely, or to a large extent. Unfortunately till now no space astrometric project has been realised. Consequently there are no astrometric observations of visual binary stars from space. Of course, the astrophysical parameters of double stars are as important as their astrometric data. A large number of double stars has been observed from space by measuring their radiation and spectra in different wavelengths regions not attainable from ground based telescopes. A good example is HZ Hercules (Her X-1).

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 62: Current Techniques in Double and Multiple Star Research , May 1983 , pp. 233 - 239
Copyright
Copyright © Lowell Observatory 1983

References

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