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Contains:  IC 4845, IC 4842, NGC 6771, NGC 6770, NGC 6769, NGC 6752
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Near and Far, 





    
        

            DavidLJ
Near and Far

Near and Far

Technical card

Resolution: 4960x2463

Dates:Aug. 31, 2016

Frames: 36x300"

Integration: 3.0 hours

Avg. Moon age: 28.68 days

Avg. Moon phase: 0.82%

Astrometry.net job: 1222127

RA center: 288.543 degrees

DEC center: -60.312 degrees

Pixel scale: 1.398 arcsec/pixel

Orientation: -179.945 degrees

Field radius: 1.076 degrees

Locations: Home observatory, Glenorie, NSW, Australia

Data source: Backyard

Description

A study of contrasting distances. The bright Pavo Globular NGC 6752 is only 13,000 light years away. Its population of 100,000 stars is contained in a ball 100 light years across. 13,000 years is a long time ago (1,000 years before the invention of fired pottery) but that pales into insignificance compared with the 190 million years that it took the light from the interacting galaxy group NGC 6769 - NGC 6771 to reach us. Non-avian dinosurs became extinct 65 million years ago and the light from these galaxies started its journey to us 125 million years before that! It's difficult to get one's head around the immense distance involved.

Crop from a mosaic of 2 panels.

Comments

Author

DavidLJ
DavidLJ
License: None (All rights reserved)
720
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Revisions

  • Near and Far, 





    
        

            DavidLJ
    Original
  • Near and Far, 





    
        

            DavidLJ
    B
  • Final
    Near and Far, 





    
        

            DavidLJ
    C

Sky plot

Sky plot

Histogram

Near and Far, 





    
        

            DavidLJ