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Contains:  NGC 6397, The star πAra
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NGC 6397 "Blue Straggler" Globular Cluster, 


            Barry Brook
NGC 6397 "Blue Straggler" Globular Cluster

NGC 6397 "Blue Straggler" Globular Cluster

Technical card

Resolution: 2215x1428

Dates:July 31, 2014

Frames: 240x30" ISO800

Integration: 2.0 hours

Darks: ~30

Flats: ~100

Bias: ~100

Avg. Moon age: 4.08 days

Avg. Moon phase: 17.72%

Bortle Dark-Sky Scale: 6.00

Mean FWHM: 2.20

Temperature: 2.00 job: 339393

RA center: 265.096 degrees

DEC center: -53.673 degrees

Pixel scale: 5.503 arcsec/pixel

Orientation: -88.419 degrees

Field radius: 2.015 degrees


A small and pretty globular from the southern skies, embedded like a jewel within a rich background of galactic stars, this cluster is located about 6,000 light years away - one of the nearest of these 'mini universes' to us. Some blue supergiants, which give it its name, are associated with the group and probably formed from stellar collisions. It bears a similarity to the more famous M4 in Scorpius.



Barry Brook
License: Attribution Creative Commons

Sky plot

Sky plot


NGC 6397 "Blue Straggler" Globular Cluster, 


            Barry Brook