NGC6543, Cat's Eye Nebula, HOO (AnaTa)

Celestial hemisphere: Northern · Constellation: Draco (Dra) · Contains: Cat's Eye Nebula · IC 4677 · NGC 6543

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NGC6543, Cat's Eye Nebula, HOO

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NGC6543, Cat's Eye Nebula, HOO

This is arguably toughest image, I have captured.
It is first my image with integration of >20h.
Unbelievable high dynamic range as well.
Here are some key points in capturing this image:
1. S2 does not work.
2. At least 5 min Ha and O3 frame are needed.
3. 5 min O3 and Ha will NOT burn center.
4. Center will be overexposed by stretching even with 5 sec O3 and Ha exposures.

Processing:
RGB are combined.
Cropping for Ha, O3 and RGB
DBE for Ha, O3 and RGB.
Color Colib for RGB
Blur and Noise XT for Ha, O3 and RGB
Star XT for Ha, O3 and RGB. RGB stars were kept; others were discarded.

Manual stretching (with HT) for Ha, O3, RGB, and RGB-stars. Note: RGB-stars will have fat blob from Cat's Eye. This should be removed by Clone Stamp.
Combined Ha and O3 as Red-Green-Blue = HOO
Mask only central part by Game script.
Apply HDR Multi-Transform until Cat's eye seen clearly in center and concentric waves are around center.
Mask whole nebula.
Local Histogram Equalization: Kernel radius of 40, 150 and then 250 (histogram resolution is 10-bit!)
Multiscale-median transform for sharpness; middle 0.3 setting.
Curves: brightness is manipulated
Mask off.
Added RGB stars.
Annotation for one panel.
Cropping for another panel.

Done

Original
Final
C

Nebulas (Planetary)

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	Distinct awarded users	Total awarded images
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	Image of the day	Top pick	Top pick nominations	Total submitted
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Other
Unknown

The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

Submitted The date and time when you submitted this image for IOTD/TP consideration.	...
Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
Promotions by Submitters When 3 distinct Submitters promote the image, it moves on to the next stage of the process: evaluation for Top Pick status. This requirement, in addition to anonymization of images and distribution to only a subset of them, prevents biases and ensures that the best images are selected.
Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
Early dismissal Staff members have a lot of images to inspect on a daily basis, and they can dismiss images if they believe they don't meet the requirements for IOTD/TP selection. If an image is dismissed 5 times, it's removed from the process. This streamlines the process and ensures that any bias present in promotions could be overruled by other staff members.

Status	Advanced success
Started	...
Astrometry.net job	9337599
PixInsight job	EPK05LWQOSTU61BGU1C6ACF54PDT3JA9
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	17h58m34s.200
RA (top/left)	17h59m48s.834
RA (top/right)	17h59m54s.458
RA (bottom/right)	17h57m18s.315
RA (bottom/left)	17h57m14s.302

Dec (center)	+66°37′56″.51
Dec (top/left)	+66°29′59″.17
Dec (top/right)	+66°45′23″.14
Dec (bottom/right)	+66°45′51″.83
Dec (bottom/left)	+66°30′27″.69

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NGC6543, Cat's Eye Nebula, HOO

NGC6543, Cat's Eye Nebula, HOO

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Image Index:

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NGC6543, Cat's Eye Nebula, HOO

NGC6543, Cat's Eye Nebula, HOO

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Acquisition details

Description

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Sky plot

Histogram

In these collections

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