Jacobus Cornelius Kapteyn

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Kapteyn, Jacobus Cornelius


Born Jan. 19, 1851, in Barneveld; died June 18, 1922, in Amsterdam. Dutch astronomer; specialist in stellar astronomy.

Kapteyn received the doctor of philosophy degree in 1875 from the University of Utrecht.

From 1875 to 1878 he worked at the University of Leiden. He also worked at the University of Groningen, where he became a professor in 1878. From 1896 to 1900, Kapteyn published a survey catalog of 454, 875 stars of the southern sky, compiled on the basis of a large amount of photographic material. In 1906 he worked out a plan for investigating the stellar sky by means of studying 206 selected areas evenly distributed throughout the sky. In 1904 he proposed a theory according to which the motions of the stars with respect to each other (the peculiar motions of stars) are not random but prefer two opposite directions in space (a theory that has not been confirmed). He worked out a number of methods for statistically studying the Milky Way Galaxy.


Hertzsprung, M. H. /. C. Kapteyn, zijn leven en werken. Groningen, 1928.
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Jacobus Kapteyn discovered the star at the end of the 19th century belonging to the galactic halo and it is the second fastest moving star in the sky.
However, part of the group of telescopes is the 1-metre-mirror Jacobus Kapteyn Telescope, the naming of which was such a wonderful gesture to this special man.
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Funded by ESA, researchers from Austria, Canada, Germany and Norway transferred the physical properties of one particle of light - a photon - onto its 'entangled' partner via quantum teleportation, thereby bridging a distance of 143 km between the Jacobus Kapteyn Telescope on La Palma and ESA's Optical Ground Station on adjacent Tenerife.
Subsequent observations with the Jacobus Kapteyn and Isaac Newton telescopes in the Canary Islands confirmed that the object, called BR 1202-07, is indeed the most brilliant ever observed.