Oesede (meteorite)

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The Oesede meteorite fell on December 30, 1927 near the Oesede monastery in the Lower Saxony town of Georgsmarienhütte in the Osnabrück district .

Impact and find

A forest worker who witnessed the fall around noon heard a loud rustling and then an impact sound. A cloud of dust rose about 30 meters from him. A black stone weighing approximately 3.6 kg was found at the site of the impact, half penetrating the frozen ground (coordinates: Oesede 52 ° 17 'N 08 ° 03' E). The stone was analyzed in the nearby steelworks, the Georgsmarienhütte . The meteorite was smashed here and a large part of it was used for the investigations.

classification

Oesede was already in 1929 as a Common Chondrit Class H 5 (for H igh iron ) characterized (Busz, 1929). The examination of a section of the 3.6 kg heavy meteorite showed a content of 28% nickel iron with an iron-nickel ratio of 9: 1. A more detailed study was published in 2009 by the Institute for Geosciences at the University of Kiel on thin sections of the find archived in the Institute for Planetology at the University of Münster (Oesede PL08006) (Bartoschewitz et al., 2009). The Oesede meteorite shows a recrystallized, transparent matrix with sharply defined chondrules and chondrule fragments. The olivine has 18.5% fayalite , 0.03% CaO and 0.05% Cr 2 O 3 . The feldspar forms grains measuring 2 to 100 micrometers, some isotropic. Kamacit contains 3.7-8.2% nickel and 0.6-0.9% cobalt while Taenit contains 15-23 % nickel and 0.6-0.9% cobalt. The Troilit contains less than 0.1% nickel and up to 0.1% cobalt. Chromite is one of the accessory minerals. Oesede is one of eight recognized Lower Saxony meteorites and one of 14 German H-chondroites that have been recovered since 1785.

Remaining pieces

After an assessment in the Georgsmarienhütte, the geologist from Osnabrück , Dr. (1893 Friedrich Imeyer - , a senior teacher at the high school for girls, four large fragments of 1965) chondrites g, respectively with a combined weight of 1,302 g and other fragments of about 100th Two of the larger pieces that went to the collection of the Natural Science Association in the Museum of the City of Osnabrück, headed by Imeyer, were lost during World War II . The two other large fragments totaling 727 g were acquired by the Mineralogical Museum in Münster (Busz, 1929). A preserved fragment of 401.1 g currently represents the main mass of the meteorite (Gehler & Reich, 2015). Another 0.06 g can be found in the Hamburg Meteorite Collection. F. Heide (1988) reports on an additional fragment of 100 g in Bonn.

See also

literature

  • Busz, K. (1929) A meteor stone that fell near Oesede, not far from Osnabrück. Publications of the Natural Science Association Osnabrück 21: pp. 13–17
  • Gehler, A. & Reich, M. (2015) Oesede: December 30, 1927 - A meteorite fall near the monastery. In: The Meteorites of Lower Saxony. Naturhistorica, reports of the Natural History Society Hannover 157, 100 p. ISSN 1868-0828
  • Graham, AL, Bevan, AWR & Hutchison, B. (1985) Catalog of Meteorites (4 / e). University of Arizona Press: Tucson.
  • Grady, MM (2000) Catalog of Meteorites (5 / e) . Cambridge University Press: Cambridge; New York; Oakleigh; Madrid; Cape Town. 689 pp.
  • Bartoschewitz, R., Appel, P. & Mader, B. (2009) Mineralogy and Petrology of two German H5 Chondrites - Oesede and Wernigerode. Meteoritics & Planetary Science 44 (Suppl.): A29
  • Heide, F. (1988) Brief Meteorite Science. Springer, Heidelberg, ISBN 978-3-642-87172-6 , p. 174
  • Eisenohr, H. (1972) Meteorite Falls in Germany. Temporal distribution of the cases and conclusions about their origin - hypotheses about the formation of the meteorites as well as other cases and finds from Germany. Stars and Space , 11th year, issue 8/9, pp. 216-219

Web links

Individual evidence

  1. ↑ Oesede. In: home.uni-osnabrueck.de. December 30, 1927. Retrieved January 7, 2017 .
  2. ↑ Thomas Witzke : Meteorite, Ordinary Chondrite H. In: www.strahl.org. April 28, 2017. Retrieved May 26, 2017 .
  3. ↑ Meteroit Oesede. In: astroamateur.de. December 30, 1927. Retrieved January 7, 2017 .
  4. ↑ [1] Bartoschewitz, R., Appel, P. & Mader, B. (2009) Mineralogy and Petrology of two German H5 Chondrites - Oesede and Wernigerode. 72nd Annual Meteoritical Society Meeting (PDF)
  5. ^ Meteoritical Bulletin: Entry for Oesede. In: lpi.usra.edu. February 18, 2016, accessed January 7, 2017 .
  6. ↑ FUNDus! - Collection portal: UHH: Universität Hamburg. In: fundus.uni-hamburg.de. February 7, 2018, accessed June 17, 2019 .