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Hans Ludendorff
Friedrich Wilhelm Hans Ludendorff (Dunowo, 26 May 1873 – Potsdam, 26 June 1941) was a German astronomer and astrophysicist. He was the younger brother of General Erich Ludendorff. After studying physics, mathematics and astronomy in Berlin, he started to work as assistant at the Hamburg observatory in 1897. The following year he changed to the Astrophysical Observatory of Potsdam, where became observator (1905) and chief observator (1915). From 1921 until his retirement in 1938 he was director of the observatory. Between 1920 and 1930 he belonged to the board of the Astronomical Society. He authored several astronomical and astrophysical works (the first was about asteroids, following his graduation in 1896), but is better known for the Ludendorff Catalogue, that lists the most important stars in the globular cluster Messier 13, published in 1905. In 1908 he established the binary character of the star Mizar B (period: 175.6 days), together with American astronomer Edwin Brant ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dunowo
Dunowo (formerly German ''Thunow'') is a village in the administrative district of Gmina Świeszyno, within Koszalin County, West Pomeranian Voivodeship, in north-western Poland. It lies approximately west of Świeszyno, West Pomeranian Voivodeship, Świeszyno, south-west of Koszalin, and north-east of the regional capital Szczecin. For the history of the region, see History of Pomerania. The village has a population of 411. References Villages in Koszalin County, Dunowo {{Koszalin-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Messier 13
Messier 13 or M13, also designated NGC 6205 and sometimes called the Great Globular Cluster in Hercules or the Hercules Globular Cluster, is a globular cluster of several hundred thousand stars in the constellation of Hercules. Discovery and visibility M13 was discovered by Edmond Halley in 1714, and cataloged by Charles Messier on June 1, 1764, into his list of objects not to mistake for comets; Messier's list, including Messier 13, eventually became known as the Messier Catalog. About one third of the way from Vega to Arcturus, four bright stars in Herculēs form the Keystone asterism, the broad torso of the hero. M13 can be seen in this asterism of the way north ( by west) from Zeta to Eta Herculis. Although only telescopes with great light-gathering capability fully resolve the stars of the cluster, M13 may be visible to the naked eye depending on circumstances. With a low-power telescope, Messier 13 looks like a comet or fuzzy patch. The cluster is visible throughout the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
