The Trifid Nebula M20 & Open Cluster M21
with 8" f/3.9 Astrograph
Uploaded 10/31/20

 

            
This was my final
            chance to image the Trifid area before it sets for the year into
            the suns glow in the west. The sky was clear and dark in Happy
            Jack and this made for a superb composition to test out the new
            ZWO camera with its larger field on a bright deep sky object.

            
The Trifid Nebula
            is the red hydrogen cloud here, and below it a reflection component
            which is blue. The star cluster M21 is to the lower right.

            
8 inch f/3.9 for
            15 minutes.

            
Select an image size for a larger view:

1400 x 1290

Instrument:  8" f/3.9 Orion Astrograph Newtonian with Baader MPCC
Mount:  Home Made GEM
Camera:  ZWO ASI071MC Pro Color CMOS
Guider: Meade DSI Pro  w/80mm piggyback refractor
Exposure:  90m
Location:  Happy Jack, Arizona, Elevation:  6900 ft.
Sky:  Seeing FWHM = 2 arcsec , Transparency 9/10
Outside Temperature:  45 F

Image Processing Tools: 
Maxim DL6:  Calibration, Color Conversion, aligning, stacking
PixInsight:  Saturation Curves
Photoshop CS2:  Curves, Color Correction, Gradient removal (Grad Xterminator), Cleanup

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