Hemisphere:  Southern  ·  Constellation: Ara (Ara)  ·  Contains:  NGC 6397  ·  The star πAra
NGC 6397 "Blue Straggler" Globular Cluster, 


            Barry Brook
NGC 6397 "Blue Straggler" Globular Cluster
Powered byPixInsight

NGC 6397 "Blue Straggler" Globular Cluster

Technical card

Imaging telescopes or lenses: Orion ED80T CF

Imaging cameras: Sony NEX-3 DSLR

Mounts: Skywatcher AZ EQ-6 GT

Guiding telescopes or lenses: Skywatcher SW120 F5 refractor

Guiding cameras: Orion StarShoot G3 Mono CCD

Focal reducers: TeleVue 0.8x Photo Reducer/Flattener TRF-2008

Software: Cartes du Ciel  ·  Nebulosity 3  ·  Stark Labs PHD2 v2.2.2g  ·  EQASCOM  ·  StarTools  ·  AstroTortilla 0.7

Dates:July 31, 2014

Frames: 240x30" (2h) ISO800

Integration: 2h

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

Basic astrometry details

Astrometry.net job: 339393

RA center: 17h 40' 23"

DEC center: -53° 40' 22"

Pixel scale: 5.503 arcsec/pixel

Orientation: -88.419 degrees

Field radius: 2.015 degrees

Resolution: 620x400


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.


Sky plot

Sky plot


NGC 6397 "Blue Straggler" Globular Cluster, 


            Barry Brook