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The Hipparcos astrometric satellite and visual double stars.

Pannunzio, R.

Astrometry from the Earth is described in this paper with particular attention to the evolution of the observational techniques from the last century to date and to the consequent improvement of results obtained by continually improved techniques. The mission's expected results are considered and the astrometric goals concerning the double and mul…

The HIPPARCOS astrometric satellite and visual double stars

Pannunzio, Renato

Astrometry from the Earth, in the past as well as at present, is described with particular attention to the evolution of the observational techniques from the last century to date and to the consequent improvement of results obtained by continually improved techniques. The scientific goals of the Hipparcos mission, the first astrometric space miss…

Results of the HIPPARCOS in-orbit payload calibration.

Davies, P. E.; McDonald, A. J. C.

The HIPPARCOS satellite is the European Space Agency's first mission dedicated to global astrometry. The spacecraft is in a geostationary transfer-type orbit with perigee at about 500 km instead of the planned geostationary orbit. From this orbit, the satellite will systematically scan the entire sky using a predefined attitude law. The output of …