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Contains:  M 35, NGC 2168, NGC 2158
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M35 and NGC 2158, 





    
        

            bobzeq25
M35 and NGC 2158

M35 and NGC 2158

Technical card

Resolution: 2730x2184

Dates:March 20, 2018

Frames:Astronomik RGB Deep Sky: 50x60" -15C bin 1x1

Integration: 0.8 hours

Flats: ~60

Bias: ~100

Avg. Moon age: 2.99 days

Avg. Moon phase: 9.76%

Bortle Dark-Sky Scale: 7.00

Mean FWHM: 3.50

Temperature: 5.00

Astrometry.net job: 1984402

RA center: 6h 8' 46"

DEC center: +24° 14' 9"

Pixel scale: 1.026 arcsec/pixel

Orientation: 239.045 degrees

Field radius: 0.498

Description

Two "open" clusters. NGC 2158, 5X further away, actually looks a bit globular. M35 is quite irregular, members occupy most all of the frame. This target looks different at different FOVs, this is about as small as I'd want to go.

Normally I use MorphologicalTransformation to reduce star size, and tone down "too many" background stars. In this case I just didn't stretch it hard. That, and using the arcsinh stretch got me good star color, you can see some variations in the usual blue and orange. the price one pays is a less vibrant image.

RGB were 14,18,18X60, flats were 20X3.

Comments

Author

bobzeq25
bobzeq25
License: None (All rights reserved)
1870
Like

Revisions

  • M35 and NGC 2158, 





    
        

            bobzeq25
    Original
  • Final
    M35 and NGC 2158, 





    
        

            bobzeq25
    B

B

Decided the first was just too saturated, too lacking in background stars (which also cut out some of NGC 2158). Replaced the arcsinh stretch with manual histogram stretch. A bit of sharpening. As always, a lot of fairly subjective decisions.

Sky plot

Sky plot

Histogram

M35 and NGC 2158, 





    
        

            bobzeq25