Hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  Solar system body or event
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Comet C/2020 F3 (NEOWISE) in a Bortle 8 sky, 



    
        

            Marzo Varea
Comet C/2020 F3 (NEOWISE) in a Bortle 8 sky
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Comet C/2020 F3 (NEOWISE) in a Bortle 8 sky

Getting plate-solving status, please wait...
Comet C/2020 F3 (NEOWISE) in a Bortle 8 sky, 



    
        

            Marzo Varea
Comet C/2020 F3 (NEOWISE) in a Bortle 8 sky
Powered byPixInsight

Comet C/2020 F3 (NEOWISE) in a Bortle 8 sky

Technical card

Imaging telescopes or lenses: Sony Carl Zeiss Vario Sonnar T* 1,8-4,9/10,4-37,1

Imaging cameras: Sony DSC-RX100 II

Software: François Meyer, team free-astro Siril  ·  Spencer Kimball, Peter Mattis and the GIMP Development Team GIMP


Dates:July 17, 2020

Frames: 37x4" (2' 28") ISO400 bin 1x1

Integration: 2' 28"

Flats: 40

Avg. Moon age: 26.28 days

Avg. Moon phase: 11.46%

Bortle Dark-Sky Scale: 9.00


Basic astrometry details

Astrometry.net job: 4988176

RA center: 9h 28' 12"

DEC center: +57° 38' 20"

Pixel scale: 45.334 arcsec/pixel

Orientation: 294.712 degrees

Field radius: 24.895 degrees


Resolution: 2358x3174

Locations: Casa (Zaragoza), Zaragoza, Aragón, Spain

Data source: Backyard

Description

C/2020 F3 (NEOWISE) from inside Zaragoza (population: 700,000) with a compact camera and no tracking. Thirty-seven 4-second takes, focal length 10.4 mm, aperture 1:1.8. I didn't even use flats at first; however I was pleasantly surprised by the gas tail, so I shared it.

Revision B has flats (obviously not perfect ones); background extraction in each subframe before registering and again after stacking; then color calibration, color saturation enhancement, and after that Asinh, CLAHE and histogram transformations; and finally noise reduction and unsharp masking in GIMP. 

Revision C has green noise reduction added, last thing in Siril  before passing the image to GIMP.

Comments

Revisions

  • Comet C/2020 F3 (NEOWISE) in a Bortle 8 sky, 



    
        

            Marzo Varea
    Original
  • Comet C/2020 F3 (NEOWISE) in a Bortle 8 sky, 



    
        

            Marzo Varea
    B
  • Final
    Comet C/2020 F3 (NEOWISE) in a Bortle 8 sky, 



    
        

            Marzo Varea
    C
  • Comet C/2020 F3 (NEOWISE) in a Bortle 8 sky, 



    
        

            Marzo Varea
    D

B

Description: Reprocess, slightly less terrible than the original version.

Uploaded: ...

C

Description: ...I forgot green noise reduction.

Uploaded: ...

D

Description: M81 and M82 are visible.

Uploaded: ...

Sky plot

Sky plot

Histogram

Comet C/2020 F3 (NEOWISE) in a Bortle 8 sky, 



    
        

            Marzo Varea