Hemisphere:  Northern  ·  Contains:  Crescent Nebula  ·  Crescent nebula  ·  NGC 6888  ·  NGC6888  ·  Sh2-105
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NGC 6888 | The Crescent, 



    
        

            Kevin Morefield
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NGC 6888 | The Crescent

Imaging telescopes or lenses: Planewave CDK14

Imaging cameras: QHYCCD QHY600M

Mounts: Planewave L-350

Guiding telescopes or lenses: Planewave CDK14

Guiding cameras: Starlight Express UltraStar Mono

Software: CCDWare CCDAutoPilot 5  ·  Adobe Photoship CC  ·  CCDWare CCDStack 2  ·  PixInsight


Dates:June 14, 2020

Frames:
Astrodon Ha 5 nm: 22x1200" (gain: 56.00) -10C bin 2x2
Astrodon OIII 3 nm: 18x1200" (gain: 56.00) -10C bin 2x2

Integration: 13.3 hours

Darks: ~10

Flats: ~20

Bias: ~20

Avg. Moon age: 23.25 days

Avg. Moon phase: 38.42%

Bortle Dark-Sky Scale: 3.00


Astrometry.net job: 3604405

RA center: 20h 12' 9"

DEC center: +38° 20' 12"

Pixel scale: 0.609 arcsec/pixel

Orientation: -3.789 degrees

Field radius: 0.264 degrees


Resolution: 2535x1836

Locations: Sierra Remote Observatory, Auberry, California, United States

Data source: Own remote observatory

Remote source: Sierra Remote Observatories

Description

A deep view of the Crescent Nebula reveals not a crescent, but the full Wolf-Rayet bubble system of WR 136.

This is the first data I've captured after spending three days installing a Planewave L-350 mount to carry the CDK14. Balance issues are critical with this mount, and I'm likely to go back to completely reconfigure the setup and improve balance and polar alignment.

While I cannot shoot unguided at this time, with guiding I've gotten some of the sharpest subs in years here. Luckily our sharp Summer nights promptly started the night I turned the new mount on!

Ha and OIII where combined (Ha) / (Ha*.1+OIII*.9) / (OIII - Ha/10) for a roughly HOO mix. I shoot RGB stars but decided I liked these NB stars more.

Calibration in CCDStack, Alignment and Image integration in PI, Sharpening in and Deconvolution in CCDStack, Topaz Denoise AI, Photoshop CC for curves, Unsharp masking, Color enhancements.

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morefield
Kevin Morefield
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            Kevin Morefield
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            Kevin Morefield
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NGC 6888 | The Crescent, 



    
        

            Kevin Morefield