Abell 21 Planetary Nebula + NGC2395 Open Cluster Pair
with 10" f/3.9 Astrograph
Uploaded 2/14/26

 

            
Few are aware of the
            companion to the Medusa nebula in Gemini. Abell 21 has a beautiful
            open cluster companion, NGC2395. Here both fit nicely into the
            1 degree field of my 10 inch, and form a thought provoking composition.
            The red ring filled with green wisps to the nebulas upper right
            is a bubble from a prior ejection event.

            
Technical Data: 10"
            f/3.9 Newtonian astrograph, Atik 16200 CCD, LRGB = 2.5 hours
            total, Payson, Az. 

            
Select an image size for a larger view:

1600 x 1290


Instrument:  10" f/3.9 Orion Astrograph Newtonian with Baader MPCC
Mount:  Astrophysics 1200 QMD
CCD Camera:  ATIK 16200 
Guider: ASI290  w/80mm WO Zenithstar 81 piggyback refractor
Exposure:  2.5 hours HaRGB
Astronomik  RGB Combine Ratio:  1: 1.05: 1.5
Location:  Payson, Arizona, Elevation:  5150 ft.
Sky:  Seeing FWHM = 3 arcsec , Transparency 5/10
Outside Temperature:  25 F
CCD Temperature:  -30 C
Image Processing Tools: 
Maxim DL6:  Calibration, PixInsight:  All Remaining processing, Photoshop CS2: Production finishing 

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