Iris Nebula in Cepheus (Aaron Freimark)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep) · Contains: Iris Nebula · NGC 7023 · T Cep · VdB139

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Iris Nebula in Cepheus

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Iris Nebula in Cepheus

A reflection nebula, Iris is a cloud of dark dust illuminated by a bright central star.

This is my second try of Iris with this equipment. Last year I was very new with image processing.

This year, I wanted to highlight the details in the bright center, making it as sharp and clear as I could. That was a bit of a challenge, since by their nature reflection nebula are pretty much blurry.

1. LRGB: WeightedBatchProcessing, Subframe Selector, Star Alignment, Local Normalization, Image Integration, Drizzle Integration, Dynamic Crop

2. LRGB: Dynamic Background Extraction

3. LRGB: EZ Denoise

4. Statistics to see that G has highest median

5. RB: LinearFit to G

6. RGB: ChannelCombination

7. Photometric Color Calibration

8. Image Solver script

9. Photometric Color Calibration

10. EZ Soft Stretch

11. L: AsinhStretch

12. L: Duplicate for Lmask

13. Lmask: StarNet++ to remove stars

14. Lmask: Export to Photoshop to focus mask

15. Lmask: HT to boost contrast

16. Apply Lmask to L

17. L: Histogram Transformation to brighten reflection nebula

18. L: HDRMultiScaleTransform (to lightness; lightness mask)

19. RGB: LRGBCombination to apply L

20. RGB: Apply Lmask

21. RGB: CurvesTransformation on nebula

22. Lmask: reduce contrast to center on brightest portion of nebula

23. RGB: CurvesTransformation

24. RGB: Unsharp Mask

25. Topaz DeNoise AI

INDI Users
Mid-Hudson Astronomical Association (MHAA)
Northeast Imagers

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	Distinct awarded users	Total awarded images
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Distribution of subject types

This table shows the distribution of awards per subject type, compared to the popularity of images of that subject type.
	Image of the day	Top pick	Top pick nominations	Total submitted
Deep sky
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Distribution of data sources

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	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
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Professional, scientific grade data
Mix of multiple sources
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	4531873
PixInsight job	QHZRGZ19QGWL3RRQIKO7HKC8Z4HSOWQJ
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	21h03m11s.23
RA (top/left)	21h12m57s.47
RA (top/right)	20h54m57s.93
RA (bottom/right)	20h54m10s.47
RA (bottom/left)	21h10m41s.66

Dec (center)	+68°21′23″.6
Dec (top/left)	+69°14′30″.7
Dec (top/right)	+69°21′58″.7
Dec (bottom/right)	+67°26′13″.7
Dec (bottom/left)	+67°19′33″.3

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Iris Nebula in Cepheus

Iris Nebula in Cepheus

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Image Index:

Contribution Index (beta):

Iris Nebula in Cepheus

Iris Nebula in Cepheus

Equipment

Acquisition details

Description

Comments

Sky plot

Histogram

In these public groups

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