NGC6888 - The Crescent Nebula in Cygnus
with 10" f/3.9 Astrograph
Uploaded 11/4/22

 
This
            dim object in Cygnus is an emission nebula surrounding a Wolf
            Rayet star, a super hot star with a high stellar wind which is
            blowing a cavity in the surrounding gas. This image shows that
            the fine structure itself is small spherical bubbles, especially
            noticeable in the blue green OIII nebulosity. To create this
            image, a long exposure standard RGB image was supplemented with
            some data from an OIII filter (Baader 4nm) and a Halpha filter
            (CS 3nm) to create this complete rendition.

            
Select an image size for a larger view:

1400 x 1290


Instrument:  10" f/3.9 Orion Astrograph Newtonian with Baader MPCC
Mount:  Astrophysics 1200 QMD
CCD Camera:  SBIG 10XME NABG with Enhanced Water Cooling
Guider: ASI120  w/80mm Vixen piggyback refractor
Exposure:  14 hours total - RGB/HOO
AstroDon RGB Combine Ratio:  1: 1.05: 1.2
Location:  Payson, Arizona, Elevation:  5150 ft.
Sky:  Seeing FWHM = 3 arcsec , Transparency 8/10
Outside Temperature:  45 F
CCD Temperature:  -20 C
Image Processing Tools: 
Maxim DL6:  Calibration, deblooming, stacking: Deepsky Stacker, PixInsight:  Curves, Deconvolution
Photoshop CC  Curves, Color Correction,  Cleanup

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