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Contains:  IC 1275, NGC 6559, IC 1274, IC 4685
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IC4685, 





    
        

            Geoff
IC4685

IC4685

Technical card

Resolution: 3969x4081

Dates:June 15, 2018

Frames: 50x600"

Integration: 8.3 hours

Avg. Moon age: 1.94 days

Avg. Moon phase: 4.18%

Astrometry.net job: 2106145

RA center: 18h 8' 56"

DEC center: -23° 59' 9"

Pixel scale: 0.729 arcsec/pixel

Orientation: 1.626 degrees

Field radius: 0.576

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

Data source: Traveller

Description

Bright gas and dark dust permeate the space between stars in NGC 6559. The gas, primarily hydrogen, is responsible for the diffuse red glow of the emission nebula. As energetic light from neighboring stars ionizes interstellar hydrogen, protons and electrons recombine to emit light of very specific colors, including the red hue observed. Small dust particles reflect blue starlight efficiently and so creates the blue reflection nebulosity seen near two of the bright stars. Dust also absorbs visible light, causing the dark clouds and filaments visible. NGC 6559 lies about 5000 light-years away toward the constellation of Sagittarius.

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Author

Geoff
Geoff
License: None (All rights reserved)
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IC4685, 





    
        

            Geoff