Hemisphere:  Northern  ·  Constellation: Cygnus (Cyg)  ·  Contains:  37 gam Cyg  ·  NGC 6910  ·  NGC6910  ·  Sadr  ·  Sh2-108  ·  The star Sadr (γCyg)
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Gamma Cygni Nebula - SHO, 


            Thomas Richter
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Gamma Cygni Nebula - SHO

Acquisition type: Electronically-Assisted Astronomy (EAA, e.g. based on a live video feed)

Technical card

Imaging telescopes or lenses: Skywatcher Esprit 80 ED Triplet Super Apo

Imaging cameras: ZWO ASI 183 MM PRO

Mounts: SkyWatcher NEQ6 Pro Goto

Guiding telescopes or lenses: Skywatcher Esprit 80 ED Triplet Super Apo

Guiding cameras: Astrolumina Alccd5L-IIc

Focal reducers: Skywatcher Field flattener for Esprit 80mm

Software: PhotoShop CS5  ·  PHD2 Guiding  ·  FitsWork 4  ·  DeepSky Stacker Deep Sky Stacker 3.3.4  ·  CCDCiel

Filters: Baader Planetarium SII 1.25" 8nm  ·  Baader Planetarium O3 1.25" 8.5nm  ·  Baader Ha 1.25" 7nm

Accessory: TSOptics TS Off Axis Guider - 9mm

Dates:May 26, 2020May 28, 2020May 30, 2020June 1, 2020

Baader Ha 2" 7nm: 40x300" (gain: 200.00) -20C bin 1x1
Baader Planetarium O3 1.25" 8.5nm: 17x600" (gain: 200.00) -20C bin 1x1
Baader Planetarium SII 1.25" 8nm: 22x600" (gain: 200.00) -20C bin 1x1

Integration: 9.8 hours

Darks: ~37

Flats: ~25

Flat darks: ~100

Avg. Moon age: 6.76 days

Avg. Moon phase: 44.13%

Astrometry.net job: 3581220

RA center: 20h 24' 24"

DEC center: +40° 14' 28"

Pixel scale: 1.199 arcsec/pixel

Orientation: -89.952 degrees

Field radius: 1.090 degrees

Resolution: 5446x3625

Locations: Nürnberg, Nürnberg, Bayern, Germany

Data source: Backyard


Object description (www.constellation-guide.com):

The Gamma Cygni Nebula, also known as the Sadr Region or IC 1318, is a diffuse emission nebula that can be seen around Sadr (Gamma Cygni), the star at the center of the Northern Cross, which marks the heart of Cygnus, the Swan. Despite the name, the star and the nebula are unrelated. Even though it looks embedded in the nebulosity, Sadr is approximately 1,800 light years distant, while the nebula is much further away, at 4,900 light years.
The Gamma Cygni Nebula is considered an emission nebula because it is ionized by the radiation of the nearby stars and it emits visible light as a result. The visible portion of the H II region stretches over an area more than 100 light years across. The nebula is illuminated by an O9-class star which is visually obscured by interstellar material.
The Sadr Region is very easy to find in the sky. Sadr is one of the bright stars of the Northern Cross and it marks the heart of the celestial Swan. It is a white supergiant star with an apparent magnitude of 2.23. With 12 solar masses and 150 times the Sun’s radius, the star is about 33,000 times more luminous than the Sun.



    Gamma Cygni Nebula - SHO, 


            Thomas Richter
  • Final
    Gamma Cygni Nebula - SHO, 


            Thomas Richter


Description: reducing color blotch

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Sky plot

Sky plot


Gamma Cygni Nebula - SHO, 


            Thomas Richter