[1704.05828] GIER: A Danish computer from 1961 with a role in the modern revolution of astronomy

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Astrophysics > Instrumentation and Methods for Astrophysics

arXiv:1704.05828 (astro-ph)

[Submitted on 19 Apr 2017]

Title:GIER: A Danish computer from 1961 with a role in the modern revolution of astronomy

Authors:Erik Høg<br>View a PDF of the paper titled GIER: A Danish computer from 1961 with a role in the modern revolution of astronomy, by Erik H{\o}g

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Abstract:A Danish computer, GIER, from 1961 played a vital role in the development of a new method for astrometric measurement. This method, photon counting astrometry, ultimately led to two satellites with a significant role in the modern revolution of astronomy. A GIER was installed at the Hamburg Observatory in 1964 where it was used to implement the entirely new method for the measurement of stellar positions by means of a meridian circle, then the fundamental instrument of astrometry. An expedition to Perth in Western Australia with the instrument and the computer was a success. This method was also implemented in space in the first ever astrometric satellite Hipparcos launched by ESA in 1989. The Hipparcos results published in 1997 revolutionized astrometry with an impact in all branches of astronomy from the solar system and stellar structure to cosmic distances and the dynamics of the Milky Way. In turn, the results paved the way for a successor, the one million times more powerful Gaia astrometry satellite launched by ESA in 2013. Preparations for a Gaia successor in twenty years are making progress.

Comments:<br>19 pages,8 figures, Accepted for publication in Nuncius Hamburgensis, Volume 20

Subjects:

Instrumentation and Methods for Astrophysics (astro-ph.IM)

Cite as:<br>arXiv:1704.05828 [astro-ph.IM]

(or<br>arXiv:1704.05828v1 [astro-ph.IM] for this version)

https://doi.org/10.48550/arXiv.1704.05828

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arXiv-issued DOI via DataCite

Related DOI:

https://doi.org/10.1017/S1743921317005336

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Submission history<br>From: Erik Høg [view email]<br>[v1]<br>Wed, 19 Apr 2017 17:15:15 UTC (1,796 KB)

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