Jacobus Kapteyn

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 and was the discoverer of evidence for galactic rotation. Kapteyn was also among the first to suggest the existence of dark matter using stellar velocities as early as 1922.

Jacobus Cornelius Kapteyn
Jacobus Kapteyn. Painting by Jan Veth (1921).
Born(1851-01-19)19 January 1851
Died18 June 1922(1922-06-18) (aged 71)
NationalityDutch
Alma materUniversity of Utrecht
Known forStar streaming
Discovery of evidence for galactic rotation
Kapteyn's star
Parallactic instrument of Kapteyn
Kapteyn Universe
AwardsBruce Medal (1913)
James Craig Watson Medal (1913)
Gold Medal of the Royal Astronomical Society (1902)
Scientific career
FieldsAstronomy
InstitutionsUniversity of Groningen
Doctoral studentsWillem de Sitter, Pieter Johannes van Rhijn, Willem Schouten, Jan Oort
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