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NGC 6946: Fireworks Galaxy with SN 2017eaw

Contains: NGC 6946

Technical card

Resolution: 4044x2688

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: 20.04 days

Avg. Moon phase: 70.89%

Astrometry.net job: 1581902

RA center: 308.662 degrees

DEC center: 60.162 degrees

Pixel scale: 0.921 arcsec/pixel

Orientation: 108.732 degrees

Field radius: 0.621 degrees

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 Sullivan
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Revisions

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