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Crescent Nebula (NGC6888) close up in Hα/SII/OIII+rgb | by Carballada
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Crescent Nebula (NGC6888) close up in Hα/SII/OIII+rgb

www.astrobin.com/9d4kgm/

 

Crescent Nebula revisited three years later with better equipment, better skies and some more skills on my side.

 

The Crescent Nebula (also known as NGC 6888, Caldwell 27, Sharpless 105) is an emission nebula in the constellation Cygnus, about 5000 light-years away from Earth. It was discovered by William Herschel in 1792. It is formed by the fast stellar wind from the Wolf-Rayet star WR 136 (HD 192163) colliding with and energizing the slower moving wind ejected by the star when it became a red giant around 250,000 to 400,000 years ago. The result of the collision is a shell and two shock waves, one moving outward and one moving inward. The inward moving shock wave heats the stellar wind to X-ray-emitting temperatures. (Wikipedia)

 

That's the first image after this long period, in part due the COVID in part because the long integration time that I wanted and how short are these summer nights.

 

It was eleven nights with two rigs resulting on 75 hours of integration time. My longest integration time so far.

 

Technical card

Imaging telescopes or lenses:Teleskop Service TS Photoline 107mm f/6.5 Super-Apo , Altair Astro RC250-TT 10" RC Truss Tube

 

Imaging cameras:ZWO ASI183MM-Cool , ZWO ASI1600MM-Cool

 

Mounts:Skywatcher EQ6R Pro , Mesu 200 Mk2

 

Guiding telescopes or lenses:Celestron OAG Deluxe , Teleskop Service TSOAG9 Off-Axis Guider

 

Guiding cameras:ZWO ASI174 Mini , ZWO ASI290 Mini

 

Focal reducers:Riccardi Reducer/Flattener 0.75x , Telescope-Service TS 2" Flattener

 

Software:Pleiades Astrophoto PixInsight , Seqence Generator Pro

 

Filters:Astrodon O-III 36mm - 5nm , Astrodon S-II 36mm - 5nm , Astrodon R Gen.2 E-series 36mm , Astrodon G Gen.2 E-series 36mm , Astrodon B Gen.2 E-series 36mm , Astrodon HA 36mm - 5nm , Astrodon L Gen.2 E-series 36mm

 

Accessory:ZWO EFW , MoonLite NiteCrawler WR30 , TALON6 R.O.R , MoonLite CSL 2.5" Focuser with High Res Stepper Motor

 

Dates:June 21, 2020 , June 22, 2020 , June 23, 2020 , June 29, 2020 , July 18, 2020

 

Frames:

Astrodon B Gen.2 E-series 36mm: 50x120" (gain: 75.00) -20C bin 1x1

Astrodon G Gen.2 E-series 36mm: 50x120" (gain: 75.00) -20C bin 1x1

Astrodon HA 36mm - 5nm: 209x600" (gain: 200.00) -20C bin 1x1

Astrodon O-III 36mm - 5nm: 105x600" (gain: 183.00) -15C bin 1x1

Astrodon R Gen.2 E-series 36mm: 50x120" (gain: 75.00) -20C bin 1x1

Astrodon S-II 36mm - 5nm: 106x600" (gain: 183.00) -15C bin 1x1

 

Integration: 75.0 hours

 

Avg. Moon age: 7.92 days

 

Avg. Moon phase: 15.25%

 

Astrometry.net job: 3721258

 

RA center: 20h 12' 6"

 

DEC center: +38° 21' 0"

 

Pixel scale: 1.007 arcsec/pixel

 

Orientation: -89.431 degrees

 

Field radius: 0.408 degrees

 

Resolution: 2328x1760

 

Locations: AAS Montsec, Àger, Lleida, Spain

 

Data source: Own remote observatory

 

Remote source: Non-commercial independent facility

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Uploaded on August 2, 2020