For the Dutch-Ghanaian minister, see Jacobus Capitein.
Jacobus Cornelius Kapteyn
Jacobus Kapteyn. Painting by Jan Veth (1921).
Born
(1851-01-19)19 January 1851
Barneveld
Died
18 June 1922(1922-06-18) (aged 71)
Amsterdam
Nationality
Netherlands
Alma mater
University of Utrecht
Known for
discovery of evidence for galactic rotation
Awards
Bruce Medal 1913
Scientific career
Fields
Astronomy
Jacobus Kapteyn on the occasion of his 40th anniversary as professor in Groningen. Sir David Gill in background. Painting by Jan Veth.
Prof Jacobus Cornelius Kapteyn FRS FRSE LLD (19 January 1851 – 18 June 1922) was a Dutch astronomer. He carried out extensive studies of the Milky Way. He found that the apparent movement of stars was not randomly distributed but had two preferential directions: the two star streams. This discovery was later reinterpreted as evidence for galactic rotation. Kapteyn also suggested that these stellar velocities could be used to find the amount of non-luminous matter in the galaxy.[1]
^Kapteyn, Jacobus Cornelius (1922). "First attempt at a theory of the arrangement and motion of the sidereal system". Astrophysical Journal. 55: 302–327. Bibcode:1922ApJ....55..302K. doi:10.1086/142670. In concurrence with his contemporaries, he used to the term "dark matter" to designate this non-lumininous matter, which was thought to be dust and gas. "It is incidentally suggested that when the theory is perfected it may be possible to determine the amount of dark matter from its gravitational effect.
Prof Jacobus Cornelius Kapteyn FRS FRSE LLD (19 January 1851 – 18 June 1922) was a Dutch astronomer. He carried out extensive studies of the Milky Way...
photographic plates JacobusKapteyn Telescope - telescope named after JacobusKapteynKapteyn's Star - star named after JacobusKapteynKapteyn (crater) - Lunar...
The JacobusKapteyn Telescope or JKT is a 1-metre optical telescope named for the Dutch astronomer JacobusKapteyn (1851–1922) of the Isaac Newton Group...
instrument of Kapteyn is a measuring instrument created by the Dutch astronomer JacobusKapteyn around 1886. Using this instrument, Kapteyn analyzed over...
the William Herschel Telescope, the Isaac Newton Telescope, and the JacobusKapteyn Telescope, operated by a collaboration between the UK Science and Technology...
institute is named after its founder, Jacobus Cornelius Kapteyn, who lived from 1851 to 1922. JacobusKapteyn was appointed professor of astronomy and...
earlier conjecture. In 1904, studying the proper motions of stars, JacobusKapteyn reported that these were not random, as it was believed in that time;...
instead of fixed sizes steps which would 'sum', was constructed by JacobusKapteyn while studying and popularizing the statistics of the log-normal in...
JKT may refer to: JacobusKapteyn Telescope Jakarta, Indonesia Kemayoran Airport, a former airport serving Jakarta Jakarta Time; see Time in Indonesia...
relatively unchallenged for the next hundred years, with minor refinements. JacobusKapteyn introduced motion, density, and luminosity to Herschel's star counts...
his work on opalescence in gases. In 1913, he became assistant to JacobusKapteyn at the astronomical laboratory of Groningen University. In 1914, Zernike...
existence of dark matter using stellar velocities was Dutch astronomer JacobusKapteyn in 1922. A publication from 1930 points to Swedish Knut Lundmark being...
the 2.5 m (8 ft 2 in) Isaac Newton Telescope and the 1 m (3 ft 3 in) JacobusKapteyn Telescope. The 2.5 m (8 ft 2 in) Nordic Optical Telescope (NOT). The...
polarization techniques.” Superluminal motion was first observed in 1902 by JacobusKapteyn in the ejecta of the nova GK Persei, which had exploded in 1901. His...
ING). The telescopes were to be a 1.0 m (39 in) (which became the JacobusKapteyn Telescope), the 2.5 m (98 in) Isaac Newton Telescope which was to be...
Copernicus Galileo Galilei George Ellery Hale William Herschel Edwin Hubble JacobusKapteyn Johannes Kepler Gerard Kuiper Joseph-Louis Lagrange Pierre-Simon Laplace...
the galaxy. In this research, he adapted the statistical methods of JacobusKapteyn to investigate individual clusters in the galaxy. His most important...
Sitter Universe Scientific career Fields Physics Doctoral advisor JacobusKapteyn Doctoral students Dirk Brouwer Willem Hendrik van den Bos Signature...
it turned out to be 41 light-years away. Kapteyn's Star, a subdwarf, was discovered in 1897 by JacobusKapteyn, the star with the highest known proper...
wife Henrietta (1881–1956) was a daughter of the Dutch astronomer JacobusKapteyn. Hertzsprung died in Roskilde in 1967. The asteroid 1693 Hertzsprung...
colonial Indonesia J. G. ten Houten, phytopathologist and botanist JacobusKapteyn, astronomer Izaak Maurits Kolthoff, chemist Philip G. Kreyenbroek,...
Department of Aerospace, Physics and Space Sciences, and Director of the JacobusKapteyn Telescope. In 2000, Batcheldor served as a student support astronomer...
a flat landing surface. The ship was carrying a base plate for the JacobusKapteyn Telescope, which was being constructed in the Canary Islands. He decided...
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