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Contains:  NGC 6357
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Into the core of NGC6357, 


            Andrew Klinger
Into the core of NGC6357
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Into the core of NGC6357

Technical card

Imaging telescopes or lenses:William Optics GT-81

Imaging cameras:ZWO ASI1600MM-Cool

Mounts:Orion Sirius EQ-G (HEQ5)

Guiding telescopes or lenses:Orion 50 mm Guide Scope

Guiding cameras:Orion Star Shoot Auto Guider

Focal reducers:William Optics Flat 6A

Software:Sequence Generator ProPHD2Cartes du CielEQMODPixInsight

Filters:Astrodon OIII 3nmHa 5nmAstrodon SII 3nm


Dates:May 31, 2019

Ha 5nm: 35x300" (gain: 200.00) -10C bin 1x1
Astrodon OIII 3nm: 33x300" (gain: 200.00) -10C bin 1x1
Astrodon SII 3nm: 34x300" (gain: 200.00) -10C bin 1x1

Integration: 8.5 hours

Darks: ~64

Flats: ~30

Bias: ~200

Avg. Moon age: 26.57 days

Avg. Moon phase: 9.60%

Bortle Dark-Sky Scale: 3.00

Basic astrometry details job: 2990496

RA center: 17h 25' 14"

DEC center: -34° 13' 51"

Pixel scale: 1.013 arcsec/pixel

Orientation: 300.554 degrees

Field radius: 0.312 degrees

Resolution: 1800x1300

Locations: Atoka dark site, Atoka, Oklahoma, United States

Data source: Backyard


Using my NGC6357 data from May 2019, I heavily cropped and re-processed the core region. This chaotic scene in space holds home to some of the most massive stars, who's stellar winds shape and excite the dust around them to form these intricate glowing nebula.

In this false-color narrowband image, I display the sulfur and hydrogen signal as the warm tones, and oxygen as blue.

OTA: William Optics GT81 w/0.8x reducer (382mm fl at f/4.7)
74mm aperture stop-down ring (brings scope to f/5.2)
Mount: Orion Sirius EQ-G (HEQ-5)
Guidescope: Orion 50mm guidescope
Guiding camera: Orion StarShoot Autoguider
Imaging camera: ZWO ASI1600MM-Cool

QHYCCD PoleMaster


Location: Atoka, OK (Bortle 3)
Dates: 5/31/19, 6/26/19, 6/27/19
Gain: 200 Offset: 50
Camera temp: -10C
Sii: 34x300" Astrodon 3nm
Ha: 35x300" Astrodon 5nm
Oiii: 33x300" Astrodon 3nm
Total integration time: 8hr 30min
64x darks per calibration (master from library)
30x flats per calibration
200x bias per calibration (master from library)

See my previous widefield posting of NGC6357 for processing workflow. The workflow was very similar except all channels were Drizzled 2x for better resolution of the core area.



Andrew Klinger
License: None (All rights reserved)

Sky plot

Sky plot


Into the core of NGC6357, 


            Andrew Klinger

In these public groups

Narrowband imaging