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Kapteyn System
* Jacobus Kapteyn - Astronomer ** Parallactic instrument of Kapteyn - the instrument used by Kapteyn to analyze photographic plates ** Jacobus Kapteyn Telescope - telescope named after Jacobus Kapteyn ** Kapteyn's Star - star named after Jacobus Kapteyn *** Kapteyn b - planet around Kapteyn's Star *** Kapteyn c - planet around Kapteyn's Star ** Kapteyn (crater) - Lunar crater named after Jacobus Kapteyn ** 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 * Paul Joan George Kapteyn - Dutch Judge {{disambig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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. Kapteyn's family and early life Kapteyn was born in Barneveld in the Netherlands to Gerrit J. and Elisabeth C. (née Koomans) Kapteyn, and was one of 15 children. Many of the Kapteyns were gifted in mathematics and physics. He passed his entrance exams for university at the age of 16 but Kapteyn's parents wouldn't allow him to go until the following year. He went to the University of Utrecht to study mathematics and physics in 1868. He did very well in his studies and when he graduated he was magna cum laude. This laid the foundation for his later career. Jacobus Kapteyn was a very doting father during the earlier years in his career and took an int ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parallactic Instrument Of Kapteyn
The parallactic instrument of Kapteyn is a measuring instrument created by the Dutch astronomer Jacobus Kapteyn around 1886. Using this instrument, Kapteyn analyzed over 1,700 glass plate photos of stars seen from the southern hemisphere.van der Kruit, P. C. (2015) Jacobus Cornelius Kapteyn, Born Investigator of the Heavens. Springer, Switzerland (p.176-182, j 204 (citing Wessel Krul), 217, h 496) This research contributed to the Cape Photographic Durchmusterung, a star catalogue containing 454,875 entries. Together with the measurements of stars seen from the northern hemisphere (the Bonner Durchmusterung) the measurements of Kapteyn formed a complete star catalogue with a scope and accuracy that was impressive for its time. The instrument is currently located in the collection of the University Museum of Groningen. Origin Since Kapteyn lacked an observatory of his own in Groningen, he used a homemade instrument for the analysis of glass plate photos of stars, made by his co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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, Spain. Funded jointly by the Netherlands and the United Kingdom with planning throughout the 1970s, construction of the JKT was completed in 1983 with the first photographic plate taken in March 1984. It can be used with two different focal points and different instruments, although by 1998 this was refined to one CCD imaging instrument. The telescope weighs nearly 40 metric tons in total. Being superseded by more recent and larger telescopes, it was taken out of service as a common-user facility in August 2003. Since 2014, the telescope is owned by the Instituto de Astrofísica de Canarias (IAC) and operated by the ''Southeastern Association for Research in Astronomy'' (SARA) which has retrofitted JKT as a remotely operated observatory ( ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 telescope. Its diameter is 30% of the Sun's, but its luminosity just 1.2% that of the Sun. It may have once been part of the globular cluster Omega Centauri, itself a likely dwarf galaxy swallowed up by the Milky Way in the distant past. The discovery of two planets— Kapteyn b and Kapteyn c—was announced in 2014, but had a mixed history of rejections and confirmations, until a 2021 study refuted both planets. The "planets" are in fact artifacts of the star's rotation and activity. History of observations Attention was first drawn to what is now known as Kapteyn's Star by the Dutch astronomer Jacobus Kapteyn in 1898. Under the name CPD-44 612 it was included in the ''Cape photographic Durchmusterung for the equinox 1875 (−38 to −52)'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kapteyn B
Kapteyn b is an exoplanet that orbits within the habitable zone of the red subdwarf Kapteyn's Star, located approximately from Earth. Kapteyn b is within the estimated habitable zone of its star. It was the closest-suspected potentially habitable exoplanet to the Solar System other than Tau Ceti e up until 2016, when Proxima Centauri b at 4.22 light-years was confirmed. It was pushed into fourth when Ross 128 b was confirmed in 2017. Later research had cast doubt on the existence of Kapteyn b, suggesting the signal is consistent with stellar activity rather than a planet. This doubt, however, has been refuted by the original discovery team, only to reappear in stronger form in 2021. The system itself is estimated to be 11 billion years old, substantially older than the Solar System. Characteristics Mass, radius, and temperature Kapteyn b is a super-Earth, a planet that has a radius and mass bigger than that of Earth, but smaller than that of the ice giants Uranus and Neptune. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kapteyn C
* Jacobus Kapteyn - Astronomer ** Parallactic instrument of Kapteyn - the instrument used by Kapteyn to analyze photographic plates ** Jacobus Kapteyn Telescope - telescope named after Jacobus Kapteyn ** Kapteyn's Star - star named after Jacobus Kapteyn *** Kapteyn b - planet around Kapteyn's Star *** Kapteyn c - planet around Kapteyn's Star ** Kapteyn (crater) - Lunar crater named after Jacobus Kapteyn ** 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 * Paul Joan George Kapteyn - Dutch Judge {{disambig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kapteyn (crater)
Kapteyn is a lunar impact crater that is near the eastern limb of the Moon, to the west of the crater La Pérouse. West of Kapteyn is the slightly smaller Barkla, and farther to the west-northwest is the prominent Langrenus. Von Behring is to the north-northeast. This crater is circular in shape, although it appears oval when viewed from the Earth Earth is the third planet from the Sun and the only astronomical object known to harbor life. While large volumes of water can be found throughout the Solar System, only Earth sustains liquid surface water. About 71% of Earth's surfa ... due to foreshortening. The rim is only slightly worn, with no craters of note along the edge or the inner walls. There is a shelf along the eastern inner wall. At the midpoint of the interior floor is a central peak. Satellite craters By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Kapteyn. Refe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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, public research university of more than 30,000 students in the city of Groningen (city), Groningen in ... in the Netherlands. The institute is named after its founder, Jacobus Kapteyn, Jacobus Cornelius Kapteyn, who lived from 1851 to 1922. Jacobus Kapteyn was appointed professor of astronomy and theoretical mechanics in 1878 at a time when no astronomical tradition, let alone an observatory, existed in Groningen (city), Groningen. Kapteyn's first "Astronomical Laboratory" was opened in 1896. In 1913, after various relocations, the laboratory moved to the Broerstraat, near the ''Academiegebouw'' in the center of the city. In 1970, the institute relocated to a new building on the campus site to the north of the city. Since 1983, the Kapteyn A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
