The  Seagull Nebula in Canis Major / Monoceros
with 8" f/3.9 Astrograph
Uploaded 4/15/21

 

            
This extensive nebula
            is normally imaged with longer focal lengths to show its full
            extent. Here we imaged the center 2 degrees with the 8 inch up
            in Happy Jack to reveal more details on the dim blue reflection
            nebulosities present. These are rarely imaged clearly since most
            imagers use Halpha filters to get the most red emission nebulosity
            which effectively eliminates the delicate blue details.

            
Two dim round objects
            are on the right side of the field. Just to the right of center
            is Sharpless 295 which is a mix of blue and red. Further to the
            upper right is Sharpless 293 a red emission object. The Seagull
            is a collection of smaller named objects.

            
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: ZWO ASI120 mini  w/80mm piggyback refractor
Exposure:  75m
Location:  Happy Jack, Arizona, Elevation:  7000 ft.
Sky:  Seeing FWHM = 1 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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