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Contains:  M 35, NGC 2168, NGC 2158, The star 5Gem
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M35 and NGC 2158, 





    
        

            Gendra
M35 and NGC 2158

M35 and NGC 2158

Technical card

Resolution: 5924x3607

Dates:Jan. 2, 2019

Frames: 27x150" ISO400

Integration: 1.1 hours

Darks: ~89

Flats: ~23

Bias: ~150

Avg. Moon age: 26.22 days

Avg. Moon phase: 11.92%

Bortle Dark-Sky Scale: 6.00

Temperature: -2.00

Astrometry.net job: 2465208

RA center: 92.268 degrees

DEC center: 24.223 degrees

Pixel scale: 0.761 arcsec/pixel

Orientation: 39.930 degrees

Field radius: 0.733 degrees

Data source: Traveller

Description

The open cluster M35 (NGC 2168) and its companion NGC 2158.

This was a test using my new MGEN together with the "big" scope. As the balance was not very good there was quite a bit of oscillation both in R.A. and in DEC with the standard parameters. But still the MGEN managed to produce quite round stars. The next time I will try to tweak the parameters and I'm pretty sure a third counterweight will be helpful.
All in all the current setup with the 8"-newton, finderscope & guiding camera, EOS 200d with the coma-corrector and the dovetail-bar weights a tiny bit more then 10kg, with is around the limit of the HEQ-5.

The first version was processed without dark frames. The second version was reprocessed after I had the chance to get some temperature-matched dark frames. However the difference was almost non-existent, most likely because the dark current was already very low at around -2°C, so there wasn’t much to subtract.

Comments

Author

Gendra
Gendra
License: None (All rights reserved)
1643
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Revisions

  • M35 and NGC 2158, 





    
        

            Gendra
    Original
  • Final
    M35 and NGC 2158, 





    
        

            Gendra
    B

B

Reprocessed with dark-frames. Slightly cropped to center the star cluster.

Sky plot

Sky plot

Histogram

M35 and NGC 2158, 





    
        

            Gendra