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Contains:  Crescent nebula, IC 4996, NGC 6888, The star 28Cyg, The star 29Cyg
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Crescent Nebula in HOO, 



    
        

            JDJ
Crescent Nebula in HOO
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Crescent Nebula in HOO

Technical card


Dates:Oct. 23, 2019Oct. 24, 2019Oct. 27, 2019

Frames:Optolong L-eNhance 2": 61x360" ISO400

Integration: 6.1 hours

Darks: ~25

Flats: ~15

Bias: ~25

Avg. Moon age: 26.14 days

Avg. Moon phase: 15.73%


Basic astrometry details

Astrometry.net job: 3071719

RA center: 20h 11' 59"

DEC center: +38° 18' 54"

Pixel scale: 2.079 arcsec/pixel

Orientation: 274.611 degrees

Field radius: 1.894 degrees


Resolution: 5510x3558

Locations: Home, Silver Spring, Maryland, United States

Data source: Backyard

Description

Last stop on my fall tour of the Cygnus region was the Crescent Nebula (NGC6668). This image is the HOO bicolor version created using images taken through an L-Enhance dual narrowband filter.

Imaged with WO GT81 at F4.7 (382 mm focal length) using Flat6A II field flattener/0.8x reducer, Optolong L-Enhance dual narrowband filter, and full spectrum modified Nikon D5300.

Pre-processed using PixInsight Batch Pre-Processing (BPP) script. Images calibrated using darks, bias, and flats. Extracted red/green/blue channels using BatchChannelExtraction script. R and G+B channels registered and stacked using StarAlighment and Integration. Total integration time of ~6 hours using 60 subs at ISO400x360 sec. R and G+B channels individually post-processed in Pixinsight: Cropped, gradient removal with ABE, MLT for noise reduction, stretched using masked stretch, Curves Transformation, TGVDenoise for noise reduction, HDR transform, Local histogram transform, morphological transform to shrink stars. HOO image generated using SHO-AIP script.

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JDJ
JDJ
License: None (All rights reserved)
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Crescent Nebula in HOO, 



    
        

            JDJ