Contains: NGC 6543, IC 4677
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Cat's Eye Nebula NGC 6543

Technical card

Imaging telescope or lens: Skywatcher Explorer 200PDS

Imaging camera: QHYCCD QHY9M

Mount: Skywatcher NEQ6 PRO Synscan

Guiding telescope or lens: Skywatcher 9x50 finderscope

Guiding camera: QHYCCD QHY5L-IIc

Focal reducer: Baader MPCC Mk III

Software: PixinsightPhotoshop

Filters: Baader Red 2"Baader L 2''Baader Blue 2"Baader Green 2"

Accessories: QHYCCD QHY 2" Filter wheelSeletek Armadillo

Resolution: 2380x1932

Dates: Sept. 3, 2016Sept. 6, 2016

Baader Blue 2": 6x600" -20C bin 1x1
Baader Green 2": 6x600" -20C bin 1x1
Baader L 2'': 18x600" -20C bin 1x1
Baader Red 2": 6x600" -20C bin 1x1

Integration: 6.0 hours

Flats: ~15

Bias: ~100

Avg. Moon age: 3.36 days

Avg. Moon phase: 13.79% job: 1239201

RA center: 269.582 degrees

DEC center: 66.655 degrees

Pixel scale: 1.106 arcsec/pixel

Orientation: 10.890 degrees

Field radius: 0.471 degrees


I think this is my fifth or sixth attempt at this target. It's better than my last, but not close to what I wanted. I think I should have used 15 minute exposures, and secondly, I couldn't HDR the core in no matter what. I tried 30 second subs for the core and those revealed the structure, but I didn't manage to combine it with the whole image (either with layermasking in PS or HDRcomposition in PI). It kind of worked in PS, but the dark area separating the eye from the longer exposure looked silly (I used a gaussian blur for the core mask). Oh well.

Is there a first shock wave visible above the main wave? About the same radius as the first.

Edit B: Included the core in PS. Probably still not the best way to do it.




Sky plot

Sky plot


Cat's Eye Nebula NGC 6543,