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Contains:  NGC 6946
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NGC 6946: Fireworks Galaxy with SN 2017eaw, 





    
        

            Chris Sullivan
NGC 6946: Fireworks Galaxy with SN 2017eaw

NGC 6946: Fireworks Galaxy with SN 2017eaw

Technical card

Resolution: 1463x950

Dates:May 15, 2017May 16, 2017May 17, 2017May 19, 2017

Frames:
ZWO Blue: 73x150" (gain: 150.00) -20C
ZWO Green: 86x150" (gain: 150.00) -20C
Baader IR-Cut Moon & Skyglow Neodymium: 80x150" (gain: 150.00) -20C
ZWO Red: 76x150" (gain: 150.00) -20C

Integration: 13.1 hours

Avg. Moon age: 20.50 days

Avg. Moon phase: 66.54%

Bortle Dark-Sky Scale: 8.00

Astrometry.net job: 1731275

RA center: 308.728 degrees

DEC center: 60.151 degrees

Pixel scale: 1.083 arcsec/pixel

Orientation: 71.160 degrees

Field radius: 0.262 degrees

Data source: Backyard

Description

The Fireworks Galaxy with SN2017eaw. Sorry for the endless revisions. I believe I got decent data, but I'm having trouble eking out the best from them. Ultimately, I'm pretty convinced that DSS is messing with my color. I think it might finally be time to invest in PixInsight.

Comments

Author

Chris-PA
Chris Sullivan
License: None (All rights reserved)
4032
Like

Revisions

  • NGC 6946: Fireworks Galaxy with SN 2017eaw, 





    
        

            Chris Sullivan
    Original
  • NGC 6946: Fireworks Galaxy with SN 2017eaw, 





    
        

            Chris Sullivan
    B
  • NGC 6946: Fireworks Galaxy with SN 2017eaw, 





    
        

            Chris Sullivan
    M
  • NGC 6946: Fireworks Galaxy with SN 2017eaw, 





    
        

            Chris Sullivan
    N
  • NGC 6946: Fireworks Galaxy with SN 2017eaw, 





    
        

            Chris Sullivan
    O
  • NGC 6946: Fireworks Galaxy with SN 2017eaw, 





    
        

            Chris Sullivan
    P
  • NGC 6946: Fireworks Galaxy with SN 2017eaw, 





    
        

            Chris Sullivan
    S
  • NGC 6946: Fireworks Galaxy with SN 2017eaw, 





    
        

            Chris Sullivan
    T
  • Final
    NGC 6946: Fireworks Galaxy with SN 2017eaw, 





    
        

            Chris Sullivan
    U

B

Revision B has SN 2017eaw marked and is heavily cropped.

M

I added a super luminance using all subframes - I think it brightened the galaxy and made it a little less noisy.

N

Crop with supernova marked.

O

Brightened background, made channel mixer adjustments, noise reduction, slightly tighter crop.

P

Crop of Version O with the supernova marked.

S

I've been struggling with the color of this one since I first uploaded it. I think I finally got it right...

T

Crop of last revision with the supernova marked.

U

I just can't leave this one alone... I finally had the bright idea of combining the dual images by giving the original a 75% crop (instead of a 50% crop) and inserting a cutout with the supernova marked. Should have figure this out 5 months ago...

Sky plot

Sky plot

Histogram

NGC 6946: Fireworks Galaxy with SN 2017eaw, 





    
        

            Chris Sullivan