I was amazed when I was this planetary nebula image from NASA’s Chandra X-ray Observatory and Hubble Space Telescope. It took much more time than I expected after realizing that I needed to add more data to get the HDR result for Cat's eye. PI's HDRComposition did a good job on the narrowband image. The color mapping is created equally from SHO and HSO. stars and background are from RGB.

Hope you like it and any C & C are welcome

Thanks,

Jian Yuan Peng

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It is a planetary nebula in the constellation of Draco, discovered by William Herschel on February 15, 1786. The Cat's Eye was the first planetary nebula to be observed with a spectroscope by William Huggins on August 29, 1864. Huggins' observations revealed that the nebula's spectrum was non-continuous and made of a few bright emission lines. The first indication was that planetary nebulae consist of tenuous ionized gas ejected from red giant stars late in their lives.

NGC 6543 estimated between 3,300 and 5,300 light-years from Earth and estimated 1000±260 years in age.

Technical details:

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Technical details:

Telescope: Celestron Edge HD11 + Reducer 0.7x

Mount: AP Mach2GTO

Imaging cameras:ZWO ASI2600MM Pro

Software: PHD2, PixInsight, Lightroom 6.4, Sequence Generator Pro, Photoshop CS6

Location: Palo Alto, California, USA

PhotometricColorCalibration data (pre-corp):

Resolution ............... 0.198 arcsec/px

Rotation ................. 104.139 deg

Reference system ......... ICRS

Observation start time ... 2021-05-19 08:26:15 UTC

Observation end time ..... 2021-06-15 10:15:18 UTC

Focal distance ........... 1956.21 mm

Pixel size ............... 1.88 um

Field of view ............ 25' 3.0" x 18' 22.1"

Image center ............. RA: 17 58 32.713 Dec: +66 37 49.20

Astrodon 50mm Unmounted 3nm Narrowband Ha, SII, OIII filters

Blue 60x60" 1 Hour Bin1x1

Green 60x60" 1 Hour Bin1x1

Red 60x60" 1 Hour Bin1x1

Ha 7x300" 29x600" 30x1200" 15.4 Hours Bin1x1

OIII 7x300" 30x600" 31x1200" 15.9 Hours Bin1x1

SII 5x300 30x600" 29x1200" 15 Hours Bin1x1