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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 fi ...
- Astronomer
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Parallactic instrument of Kapteyn - the instrument used by Kapteyn to analyze photographic plates
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Jacobus Kapteyn Telescope
The Jacobus Kapteyn Telescope or JKT is a 1-metre optical telescope named for the Dutch astronomer Jacobus Kapteyn (1851-1922) of the Isaac Newton Group of Telescopes at the Roque de los Muchachos Observatory on La Palma in the Canary Islands, Sp ...
- telescope named after Jacobus Kapteyn
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Kapteyn's Star
Kapteyn's Star is a class M1 red subdwarf about 12.83 light-years from Earth in the southern constellation Pictor; it is the closest halo star to the Solar System. With a magnitude of nearly 9 it is visible through binoculars or a te ...
- star named after Jacobus Kapteyn
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Kapteyn b - planet around Kapteyn's Star
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Kapteyn c - planet around Kapteyn's Star
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Kapteyn (crater) - Lunar crater named after Jacobus Kapteyn
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Kapteyn Astronomical Institute
The Kapteyn Astronomical Institute is the department of astronomy of the University of Groningen
The University of Groningen (abbreviated as UG; nl, Rijksuniversiteit Groningen, abbreviated as RUG) is a Public university#Continental Europe, pu ...
- Dutch Astronomical Institute named after Jacobus Kapteyn
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Paul Joan George Kapteyn - Dutch Judge
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