Contains:Crescent nebula, NGC 6888
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The Crescent Nebula, 




    

        Don Curry
The Crescent Nebula

The Crescent Nebula

Technical card

Resolution: 1543x1186

Dates: June 11, 2018

Frames: 24x1800"

Integration: 12.0 hours

Avg. Moon age: 26.90 days

Avg. Moon phase: 7.64%

Astrometry.net job: 2102933

RA center: 303.039 degrees

DEC center: 38.362 degrees

Pixel scale: 0.810 arcsec/pixel

Orientation: 80.580 degrees

Field radius: 0.219 degrees

Locations: Home Observatory, Kingman, Arizona, United States

Data source: Backyard

Description

A real labor of love and a challenge imaging this from my backyard. I'm dealing with extreme hot nightly temperatures all night at 80 to 85F. Cooler is running at 100% for most the night. I may need to stop imaging this for 1 week until the nightly temperature drops to 68F ; but then I'll be approaching the start of the monsoon season.
This is about 10 hours of data so far and teasing out the OIII has been a real challenge along with the hot nightly temperatures with rolling clouds spoiling my OIII data collection from last night. I had to drop 1 hours of data due to this from my OIII.
The current final image has about 5 additional hours of OIII ; but curious to me I thought I would see much more detail and if I stretch the data more then my stars start to blow up unless maybe I try a star mask.
Unable to maintain -25C for my cooler during the hot summer all night weather conditions in Northern Arizona. I'm running at -18C and my darks were taken at a -25C so I may be having problems with my darks taken during the winter at -25C without knowing my first summer in this weather the challenges I'm having.
I still have used my flat, dark, bias library anyway during this updated final image and it did seem to help the overall quality of the master final image.
Finally was able to bring out more from the OIII data set. I went back and very carefully hand picked the very best images to stack and it made a big difference in the final stack. The OIII data now is nearly twice that of the Ha all 30 minute guided from my backyard. I used about 16 OIII's and about 8 Ha's all 30 minute guided.

Comments

Author

trombone76
Don Curry
License: Attribution-NonCommercial-NoDerivs Creative Commons
820
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Revisions

  • The Crescent Nebula, 




    

        Don Curry
    Original
  • The Crescent Nebula, 




    

        Don Curry
    B
  • The Crescent Nebula, 




    

        Don Curry
    C
  • The Crescent Nebula, 




    

        Don Curry
    D
  • The Crescent Nebula, 




    

        Don Curry
    F
  • Final
    The Crescent Nebula, 




    

        Don Curry
    G

B

RE-worked the DBE and crop in Pixinsight for better background control.

F

Added additional Biases, darks and flats

Sky plot

Sky plot

Histogram

The Crescent Nebula, 




    

        Don Curry