By Vladas Vansevicius,Arunas Kucinskas,Jokubas Sudzius

Astrometry from house used to be played for the 1st time and with nice good fortune via the ESA Hipparcos satellite tv for pc (1989-93). This venture used to be designed as an as­ trometry challenge, however the use of a photon counting detector made it attainable to supply extremely important photometric effects: the main actual astronomical pho­ tometry ever by way of the most Hipparcos undertaking in a really extensive band of 120000 stars, and the two-colour Tycho-2 photometry of 2.5 million stars. The cornerstone ESA project GAIA was once licensed in October 2000 for release no longer later than 2012. This project will use CCDs in time-delayed integration mode rather than the photo-cathode detectors utilized in Hipparcos. a result of larger quantum potency of the CCDs, simultaneous integration of many stars, and bigger tele­ scope apertures GAIA will make the most of the megastar gentle 1000000 instances extra successfully than Hipparcos, leading to astrometry and multi-colour photometry for one thousand million stars. GAIA photometry is essential for the medical usage of the astrometric effects, and the photometric info have a excessive clinical content material in themselves.

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