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Contains:  Trifid nebula, M 20, NGC 6514
Getting plate-solving status, please wait...
M20 3nm Ha, 


            Dave (Photon)
M20 3nm Ha

M20 3nm Ha

Technical card

Resolution: 3326x2504

Dates:April 25, 2013

Frames:Astrodon Tru-Balance - H-a 50mm - 3nm FWHM 656.3nm: 14x600" (gain: 0.42) -35C bin 1x1

Integration: 2.3 hours

Darks: ~50

Flats: ~20

Flat darks: ~50

Bias: ~50

Avg. Moon age: 14.39 days

Avg. Moon phase: 99.84%

Bortle Dark-Sky Scale: 2.00 job: 107774

RA center: 270.579 degrees

DEC center: -23.035 degrees

Pixel scale: 0.377 arcsec/pixel

Orientation: 179.787 degrees

Field radius: 0.218 degrees

Locations: SpaceIgloo Observatory, Williamson, AZ, United States


This image was captured using my new RCOS 12.5" carbon fiber astrograph. The data was created with 14 600s subs of 3nm Ha data at 2857mm FL. I used an MMOAG nad ST402ME to autoguide my ASA DDM85X-SL mount.

It's really interested to watch a guide star at this focal length and a lot of information can be obtained about both the tracking capabilities of the mount as well as the seeing conditions in which you are imaging.

The images were processed in CCDStack and PixInsight.



Dave (Photon)
License: None (All rights reserved)

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M20 3nm Ha, 


            Dave (Photon)