Diverse families verzameld door Marianne van Harten » Jacobus Cornelius Kapteijn (1851-1922)

Persoonlijke gegevens Jacobus Cornelius Kapteijn 

• Hij is geboren op 19 januari 1851 in Barneveld.
• Opleiding: ?.

  studied at the University of Utrecht from 1868. He moved to the Leiden astronomical observatory in 1875, and three years later became the first Professor of Astronomy and Theoretical Mechanics at the University of Groningen
  Kapteyn's initial work was analysing photographs of Southern hemisphere stars taken at the Cape Town Observatory in South Africa. This resulted in the publication between 1896 and 1900 of the Cape Photographic Durchmusterung, listing positions andmagnitudes for nearly 455,000 stars.
  His subsequent work, published in 1904, used the technique of trigonometric parallax to measure the proper motion of stars. He found the first evidence tha proper motions were not random, but that stars could be devided into two stream apparentlymoving in opposite directions. This represented the first evidence for the rotation of our galaxy.
  In 1906 Kapteyn started a major study of the distribution of stars in the galaxy, using counts of stars in different directions. This involved measuring the magnitude, spectral type, radial velocity and proper motion of stars in 206 zones. It represented the first major international collaborative project in astronomy, involving over 40 observatories.
  The conclusions were published in 1922, and described a lens-shaped island universe, whose density decreased away from the centre. This galaxy was thought to be 40,000 light-years in size, the sun being relatively close (2,000 light-years) to thecentre. The discovery of interstellar extinction after Kapteyn's death resuled in the estimated size of the galaxy being increased to 100,000 light-years, and the sun being relegated to a distance of 30,000 light years from its centre.
  Kapteyn was a member of the French Academy of Science, a Fellow of the Royal Society and a founder member of the French Academy of Science, a Fellow of the Royal Society and a founder member of the International Astronomical Union.
  He died in Amsterdam on 18th June 1922.

• Hij is overleden op 18 juni 1922 in Amsterdam, hij was toen 71 jaar oud.
• Een kind van Gerrit Jacobus Kapteijn en Elisabeth Cornelia Koomans

Gezin van Jacobus Cornelius Kapteijn

Hij is getrouwd met Catharina Elisabeth"Elize" Kalshoven.

Zij zijn getrouwd op 17 juli 1879 te Utrecht, hij was toen 28 jaar oud.Bron 1

Kind(eren):

1. Jacoba Cornelia Kapteyn  1880-???? 
2. Henriette Mariet Augustine Albertine Kapteyn  1881-1956 
3. Gerrit Jacobus Kapteyn  1883-1937 

Notities over Jacobus Cornelius Kapteijn

studied at the University of Utrecht from 1868. He moved to the Leiden astronomical observatory in 1875, and three years later became the first Professor of Astronomy and Theoretical Mechanics at the University of Groningen
Kapteyn's initial work was analysing photographs of Southern hemisphere stars taken at the Cape Town Observatory in South Africa. This resulted in the publication between 1896 and 1900 of the Cape Photographic Durchmusterung, listing positions andmagnitudes for nearly 455,000 stars.
His subsequent work, published in 1904, used the technique of trigonometric parallax to measure the proper motion of stars. He found the first evidence tha proper motions were not random, but that stars could be devided into two stream apparentlymoving in opposite directions. This represented the first evidence for the rotation of our galaxy.
In 1906 Kapteyn started a major study of the distribution of stars in the galaxy, using counts of stars in different directions. This involved measuring the magnitude, spectral type, radial velocity and proper motion of stars in 206 zones. It represented the first major international collaborative project in astronomy, involving over 40 observatories.
The conclusions were published in 1922, and described a lens-shaped island universe, whose density decreased away from the centre. This galaxy was thought to be 40,000 light-years in size, the sun being relatively close (2,000 light-years) to thecentre. The discovery of interstellar extinction after Kapteyn's death resuled in the estimated size of the galaxy being increased to 100,000 light-years, and the sun being relegated to a distance of 30,000 light years from its centre.
Kapteyn was a member of the French Academy of Science, a Fellow of the Royal Society and a founder member of the French Academy of Science, a Fellow of the Royal Society and a founder member of the International Astronomical Union.
He died in Amsterdam on 18th June 1922.

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