Sharpless 2-135 in Cassiopeia
with NEXUS coma corrector
with 10" f/3.9 
1/19/25

 

            
Seldom imaged, this
            beautiful small emission nebula in Cassiopeia is designated Sharpless
            2-135. It lies in an active field of tenuous hydrogen gas and
            just below is the striking open cluster NGC7261. The bright double
            star on the left side is Delta Cass.

            
Technical Data: 10"
            f/2.9 Newtonian astrograph, Atik 16200 CCD, LRGB = 4 hours total,
            Payson, Az. 

            
Select an image size for a larger view:

1400 x 1290


Instrument:  10" f/3.9 Orion Astrograph Newtonian with Nexus 0.75x CC
Mount:  Astrophysics 1200 QMD
CCD Camera:  ATIK 16200 
Guider: ASI290  w/80mm WO Zenithstar 81 piggyback refractor
Exposure:  4h
Astronomik  RGB Combine Ratio:  1: .9: 1.6 = G2V  calibrated
Location:  Payson, Arizona, Elevation:  5150 ft.
Sky:  Seeing FWHM = 3 arcsec , Transparency 9/10
Outside Temperature:  45 F
CCD Temperature:  -30 C
Image Processing Tools: 
Maxim DL6:  Calibration, PixInsight:  All Remaining processing, Production finishing: Photoshop CS2

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