Hemisphere:  Northern  ·  Constellation: Cygnus (Cyg)  ·  Contains:  Cocoon Nebula  ·  IC 5146
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Cocoon in a sea of stars, 



    
        

            Robert Shepherd
Cocoon in a sea of stars
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Cocoon in a sea of stars

Getting plate-solving status, please wait...
Cocoon in a sea of stars, 



    
        

            Robert Shepherd
Cocoon in a sea of stars
Powered byPixInsight

Cocoon in a sea of stars

Technical card

Imaging telescopes or lenses: TS Optics 10" f/4 ONTC Newton

Imaging cameras: ZWO ASI 1600MM PRO

Mounts: iOptron CEM60

Guiding telescopes or lenses: TS Optics 10" f/4 ONTC Newton

Guiding cameras: ZWO ASI 120mm Mini

Focal reducers: Tele Vue Optics Paracorr x1.15

Software: Pleiades Astrophoto S.L. PixInsight  ·  Stefan Berg (aka Isbeorn) NINA - Nighttime Imaging ‘N’ Astronomy

Filters: Baader Ultra-Narrowband Ha 3,5nm Filter (36 mm)  ·  ZWO B 36mm GenII  ·  ZWO G 36mm GenII  ·  ZWO R 36mm GenII

Accessory: ZWO EFW 7x36mm  ·  ZWO EAF Electronic Auto Focuser  ·  ZWO OAG M48


Dates:July 17, 2021July 18, 2021July 20, 2021July 22, 2021

Frames:
ZWO B 36mm GenII: 123x60" (2h 3') (gain: 76.00) -15C bin 1x1
ZWO G 36mm GenII: 122x60" (2h 2') (gain: 76.00) -15C bin 1x1
ZWO Ha 36mm 7nm: 20x600" (3h 20') (gain: 139.00) -15C bin 1x1
ZWO R 36mm GenII: 90x60" (1h 30') (gain: 76.00) -15C bin 1x1

Integration: 8h 55'

Darks: 100

Flats: 30

Flat darks: 100

Avg. Moon age: 9.93 days

Avg. Moon phase: 73.03%

Bortle Dark-Sky Scale: 5.00

Mean SQM: 19.80

Temperature: 13.00


Basic astrometry details

Astrometry.net job: 4797378

RA center: 21h53m21s

DEC center: +47°2150

Pixel scale: 0.684 arcsec/pixel

Orientation: 81.368 degrees

Field radius: 0.554 degrees


Resolution: 4656x3520

Locations: Heimsternwarte, Kempen, NRW, Germany; Kempen, Kempen, NRW, Germany

Data source: Backyard

Description

The Cocoon Nebula (IC5146) seems to be ploughing its way through a sea of stars. To me it was important to capture natural looking stars and at the same time reveal the faint details in the nebula.
Hence my approach collecting short subs for the RGB in order to preserve their colour.
I was planning on adding narrowband data to get some more detail in the nebula. To my surprise, there is plenty of S2 signal in the nebula, next to Ha as was to be expected. I couldn’t see any signs of O3, though. In the end I didn’t find a pleasing solution to integrating the S2 data, without making the image worse, so I went with HaRGB. I did not add Ha to the red channel, but used it as luminance.

Comments

Sky plot

Sky plot

Histogram

Cocoon in a sea of stars, 



    
        

            Robert Shepherd