IC443 in Gemini - The Jellyfish Nebula
Super nova remnant in Gemini
Uploaded 2/20/21

 
This
            remnant of a super nova explosion has not been accurately dated,
            occurring between 3,000 and 30,000 years ago. The expanding bubble
            of nebulosity resembles a huge cosmic cnidarian and is a challenge
            to image because of its faint extended tendrils. This 1.5 degree
            field here includes the super bright Eta Geminorium on the upper
            left, a 3.2 magnitude M type super giant star that dominates
            the image with its orange hue. This star being so close to the
            nebula is why it is so difficult to obtain a clear image of this
            object. This deep 2.5 hour exposure also records a "River
            of nebulosity" on the lower right edge seen here flowing
            off the frame. This connects it with IC444, another extended
            faint nebulosity in this part of the sky.

            
Select an image size for a larger view:

1400 x 1200


Instrument:  10" f/3.9 Orion Astrograph Newtonian with Baader MPCC
Mount:  Astrophysics 1200 QMD
Camera:  ZWO ASI071MC Pro Color CMOS
Guider: ZWO ASI mini  w/80mm piggyback refractor
Exposure:  2.5h
Location:  Payson, Arizona, Elevation:  5150 ft.
Sky:  Seeing FWHM = 2 arcsec , Transparency 9/10
Outside Temperature:  35 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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