In some distance to the Trapezium is another ultra-luminous O-type star, Theta-2-Ori A. The brightest star in the Trapezium is the young and hot O-type star Theta-1-Ori C. Larger telescopes can resolve several more components. In smaller telescopes four stars can be identified in the Trapezium. The center of the Orion Nebula is formed by the Trapezium. Nebula has been observed over the full wavelength range from radio waves to high energetic radiation. Today the Orion Nebula is one of the best studied celestial objects at all. The photographic emulsion Draper used had a quantum efficiency which was about 3000 times smaller compared to the sensors of modern DSLR cameras! The first photographic image of the nebula was made by the US amateur astronomer Henry Draper in 1880. Hodierna’s work was totally ignored until recently and the discovery of the non-stellar nature of the Orion Nebula was credited to the Dutch scientist Christiaan Huygens. The first known drawing of the nebula itself was made by the Italian astronomer and Roman Catholic priest Giovanni Battista Hodierna in 1654. In ancient times the Orion Nebula was most likely considered as a star like object. The Orion Nebula (M42) is a relatively bright object in the night sky and is one of the few emission nebula/HII regions that can be seen by the naked eye. Orion Nebula region (Canon 700D, Canon EF 200mm 1:2,8 L II USM, High Dynamic Range picture of 122 stacked 1 second, 5 second and 30 second exposures).
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