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Barnard 84 (The Claw Nebula, The Dark Scorpion), 





    
        

            Geoff
Barnard 84 (The Claw Nebula, The Dark Scorpion)

Barnard 84 (The Claw Nebula, The Dark Scorpion)

Technical card

Resolution: 4096x4096

Dates:May 5, 2019

Frames: 18x600"

Integration: 3.0 hours

Avg. Moon age: 0.54 days

Avg. Moon phase: 0.32%

Astrometry.net job: 2816330

RA center: 17h 46' 5"

DEC center: -20° 10' 44"

Pixel scale: 0.729 arcsec/pixel

Orientation: 0.808 degrees

Field radius: 0.586

Locations: Wiruna Dark Sky Site, Ilford, NSW, Australia

Data source: Traveller

Description

This is one of the dark nebula identified in a photographic survey by E. E. Barnard. It is a dense interstellar cloud that obscures the light from objects such as stars or bright nebulae lying behind it. These dark clouds contain minute dust particles, coated with frozen carbon monoxide and nitrogen, which effectively block the passage of light at visible wavelengths. The whole area of the image is in an extremely dusty area of the sky, which leads to a marked reddening of the image

(From Wikipedia) Barnard was a pioneering astrophotographer. His Barnard Catalogue lists a series of dark nebulae, known as Barnard objects, giving them numerical designations akin to the Messier catalogue. They begin with Barnard 1 and end with Barnard 370. He published his initial list with the 1919 paper in the Astrophysical Journal, "On the Dark Markings of the Sky with a Catalogue of 182 such Objects".

He died on February 6, 1923 in Williams Bay, Wisconsin, and was buried in Nashville. After his death, many examples from his exceptional collection of astronomical photographs were published in 1927 as A Photographic Atlas of Selected Regions of the Milky Way, this work having been finished by Edwin B. Frost, then director of Yerkes Observatory, and Mary R. Calvert.

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Geoff
Geoff
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  • Barnard 84 (The Claw Nebula, The Dark Scorpion), 





    
        

            Geoff
    Original
  • Final
    Barnard 84 (The Claw Nebula, The Dark Scorpion), 





    
        

            Geoff
    C

Sky plot

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Barnard 84 (The Claw Nebula, The Dark Scorpion), 





    
        

            Geoff