Hemisphere:  Northern  ·  Constellation: Cygnus (Cyg)  ·  Contains:  Crescent Nebula  ·  IC 1311  ·  IC 4996  ·  NGC 6888  ·  The star 28Cyg  ·  The star 29Cyg  ·  The star 34Cyg  ·  The star 36Cyg
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The Cygnus - Crescent Nebula and surroundings, 


            Marco Prelini
The Cygnus - Crescent Nebula and surroundings
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The Cygnus - Crescent Nebula and surroundings

Technical card

Imaging telescopes or lenses: Canon EF 70-200 f/4 L IS USM  ·  Sky-Watcher 200/1000 PDS

Imaging cameras: ZWO ASI 294MC Pro

Mounts: Sky-Watcher AZ EQ6-GT

Guiding telescopes or lenses: Artesky Ultraguide 60/240 mm

Guiding cameras: ZWO ASI 120 MM Mini

Focal reducers: Baader MPCC Mark III

Software: Photoshop CC  ·  Sequence Generator Pro  ·  PixInsight

Filters: Baader OIII 2.0" 7nm CCD  ·  Baader Ha 2" 7nm CCD  ·  L-Pro 2"

Dates:March 2, 2019March 8, 2019April 12, 2020April 17, 2020

Baader Ha 2" 7nm CCD: 57x300" (gain: 120.00) -10C bin 1x1
Baader Ha 2" 7nm CCD: 14x480" (gain: 120.00) -20C bin 1x1
L-Pro 2": 14x300" (gain: 120.00) -20C bin 1x1
Baader OIII 2.0" 7nm CCD: 78x300" (gain: 250.00) -10C bin 1x1

Integration: 14.3 hours

Darks: ~26

Flats: ~26

Flat darks: ~31

Bias: ~21

Avg. Moon age: 17.92 days

Avg. Moon phase: 29.73%

Bortle Dark-Sky Scale: 7.00

Mean SQM: 18.50

Temperature: 7.50

Basic astrometry details

Astrometry.net job: 3435329

RA center: 20h 11' 24"

DEC center: +38° 42' 39"

Pixel scale: 4.937 arcsec/pixel

Orientation: 294.037 degrees

Field radius: 3.409 degrees

Resolution: 4116x2788

Locations: Home Backyard, Meda, Milano, Italy

Data source: Backyard


This is part 1 of a bigger mosaic that i’m planning to shoot. It shows a small part of the Cygnus nebular complex with the Crescent Nebula at his center.

The Crescent Nebula is an emission nebula probably formed by the outer layers of a Wolf-Rayet star found at its center.

This is a merge of an HOO image taken with a Canon photo lens and an HRGB image taken one year ago with a 200/1000 newtonian.


Sky plot

Sky plot


The Cygnus - Crescent Nebula and surroundings, 


            Marco Prelini