OVERBEEK, Michiel Daniel [BSc; Pr Ing; AFRAES] Amateur AstronomerBorn: 15 September 1920, Ermelo, Mpumalanga, South Africa. Died: Johannesburg, South Africa. |
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Famous for: More than 250 000 observations of Variable Stars. (The world record for any observer: Amateur or Professional) Elected twice as President of ASSA (1961/2 and 1998/9) . Summary: Danie Overbeek learned his love for astronomy at a young age from his Grandfather. It was one of his courses at University. Although he worked as an aeronautical engineer (and traveled the world) he consistently observed variable stars and send in the reports to the AAVSO (American Association of Variable Star Observers). The precious observing time of Hubble Space Telescope was even on occasion scheduled according to data supplied by Overbeek. He is the most recognized variable star observer |
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Historical background : |
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History: Most of the details below (unless otherwise stated) were taken from a Curriculum Vitae drawn up by Danie Overbeek. [ASSA Archive: Overbeek Collection; Curriculum Vitae]. He describes the events as milestones (mostly milepebbles) in his life. 15 September 1920. Danie was born in Ermelo, South Africa and Christened on 5th December of the same year.[ASSA Archive: Overbeek Collection; Personal Documents] At the approximate age of five years he went to his parents in terror to report that “the stars are moving” He said it must have been to wavy, pre-float glass window panes. In July 1928, at a camp fire on the beach below the Polana Hotel, Lourenco Marques (Maputo) Mozambique his Grandfather pointed Mars out to him. He was so intrigued by the fact that the heavenly bodies have names that he started reading any Astronomical material he could get hold of. 1935: Made his first telescope. (15 years old) It was manufactured from a reading glass for which he used a pocket microscope as an eyepiece. It worked (after a fashion) “Over the years proceeded to more powerful instruments with 1 – 2 dioptre spectacle lens OG’s. 1937: Bought a “powerful 60x telescope” by post from Brownscope Company in New York for about $4.48. Danie’s comment: “worked fine at about 10x once the terrestrial erector lenses had been removed. Showed the Galilean satellites well.” 1938: Matriculated (finished High School) at EHS (Ermelo High School) 1951: (Age of 31) Constructed a 6-inch Newtonian and started observing occultations and variable stars. 1953: Built 12 ½ inch Dall-Kirkham Cassegrain. 1956: Chairman Transvaal Centre of ASSA. (Astronomical Society of Southern Africa) 1958: BSc, Unisa in mathematics and astronomy. 1961: President of ASSA. 1971: AFRAES (Associate Fellow, Royal Aeronautical Society) 1971: Pr Ing (Register of Professional Engineers) 1977: Council Member of AAVSO (American Association of Variable Star Observers) 1981: Started with solar flare SID/SES recording. 1981: Built a magnetometer for fun and started monitoring the Earth’s magnetic field. 1990: Built a seismograph and monitor seismic activities. 1998: President of ASSA Honours bestowed on Overbeek:AAVSO stands for American Association of Variable Star Observers. 1978: Honorary Member of the Transvaal Centre of ASSA. Personal:1920 September 15: Born at Ermelo in the old Eastern Transvaal, now Mpumalanga. Overbeek was a ferocious letter writer to the Newspapers. The topics ranged from National Politics (emigration and national transportation system); Local Politics (traffic signs, bus tax, the local library) to everyday topics like musical performances to the metric system. This is another dimension to the creative man, in fact it goes back many years. Age approaching The following story was told to me about Danie: late afternoon one day Danie travelled somewhere to be in a premium place to observe a predicted GRAZING OCCULTATION. He found a promising observing spot in a GRASS FIELD close to a road, and as it became dusk he was setting up his instruments. Next moment a policemen saw “this suspicious person next to the road.” He asked Danie what he was doing, and imagine the consternation on his face when Danie replied; GRAZING! [cdc] |
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Link to the Telescope Manufacturers. |
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Reading Glass telescope. Handmade his first telescope in 1935. (15 years old) Handmade: “Over the years proceeded to more powerful instruments with 1 – 2 dioptre spectacle lens OG’s. Telescope by Brownscope Company of New York. (60x magnification) Handmade: 6-inch Newtonian in 1951. Handmade: 12 ½ inch Dall-Kirkham Cassegrain in 1953. Handmade: Magnetometer in 1981. Measured Earth’s magnetic field. Handmade: Seismograph in 1990. Measured Earth’s seismic activities. |
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Link to the Main Bibliography Section and more information about Sources. |
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Remaining Artifacts:
. Bibliography: ASSA Archive: Overbeek Collection By Overbeek: Occultations: Grazing Occultation of Antares, 1968 August 3; MNASSA Vol. 27 p.112, with GFC Knipe. Variable Stars: Other: Various articles for different ASSA Centre Newsletters. Archival: |
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Gallery
Due to the available amount of material a second page has been created for the Gallery of MD Overbeek
Source: A.S.S.A. Symposium 2002: Paper 02 Mattei: Danie Overbeek Memorial Lecture