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Contains:  Helix nebula, NGC 7293
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NGC7293 Helix Nebula

Technical card

Resolution: 1332x999

Dates:Aug. 25, 2017

Frames: 115x180"

Integration: 5.8 hours

Avg. Moon age: 3.84 days

Avg. Moon phase: 15.75%

Astrometry.net job: 1791316

RA center: 337.418 degrees

DEC center: -20.838 degrees

Pixel scale: 1.460 arcsec/pixel

Orientation: 262.111 degrees

Field radius: 0.338 degrees

Locations: Hakos Guest Farm, 100km past Windhoek, Namibia

Description

The Helix strikes the Zenith in Namibia, so I took the advantage to try a photo in LRGB Ha and OIII channels, using an 8" f/4 Newtonian and ASI1600MMC in the south observatory of your Viennese club WAA. 28+14+12+14 x3min subframes LRGB and 24+23 x3min subframes Ha and OIII. Yes, 3min only each, ASI at zero gain, barely background limited in Namibia. ;-)

Presented are a crop on the main part of the Helix and its delicate interior structures, a 66% sized full field showing the outer portions in Ha alsong with some field galaxies, an annotated version, and a blink between Ha and OIII frames. How different the nebula looks in these channels!

Structures are enhanced a bit mostly by PixInsights HDR compression tool, only a little sharpening. The LRGB mix is just enhanced by NB in the weaker parts, and part of NB is used as a Luminance enhancement in the respective color channels.

Comments

Author

tommy_nawratil
tommy_nawratil
License: None (All rights reserved)
135312
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Revisions

B

full field

C

full field annotated

D

blink H-Alpha and OIII frames

Sky plot

Sky plot

Histogram

NGC7293 Helix Nebula , 





    
        

            tommy_nawratil