NGC 2170, The Angel Nebula (Jari Saukkonen)

Celestial hemisphere: Southern · Constellation: Monoceros (Mon) · Contains: LBN 993 · LBN 994 · LBN 995 · LBN 998 · LBN 999 · LDN 1646 · NGC 2170 · NGC 2182 · VdB68 · VdB69

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NGC 2170, The Angel Nebula

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NGC 2170, The Angel Nebula

Are angels always this hairy?

The Angel Nebula is a very interesting target, with lots going on both in colour and dynamics. Reflection nebulae, emission nebulae, dark nebulae.. it has everything.

I included some notes of my processing flow below, let me know if you find them useful and I could make it a regular thing.

Processing notes

Preparing luminance:

Combine L, R, G, B stacks into superluminance (here: “LL”) with ImageIntegration
Apply BlurXTerminator and NoiseXTerminator

Preparing RGB:

Apply BlurXTerminator (correct only)
Colour calibration with SPCC
Apply BlurXTerminator and NoiseXTerminator

Preparing LRGB:

Stretch RGB and LL identically (use same midpoint-value in HistogramTransformation)
LRGBCombination
Unstretch image back to linear (use 1-m midpoint for HT)

Processing in PI:

Stretch image with GeneralizedHyperbolicStretch and HT, multiple iterations
SCNR 50%
Run StarXTerminator, separate into “nebula” and “stars”

Processing in Photoshop:

Bring nebula and stars into Photoshop as separate layers
De-emphasize stars with 1px minimum filter and slight levels adjustment
Apply Camera Raw Filter to nebula, tweak to taste

Processing in Lightroom:

Final color/saturation and contrast adjustments

Please note: The following tables are updated every 24 hours.

Distribution of astrophotographers

This table shows the number of distinct astrophotographers who have been assigned and IOTD/TP award compared to the total number of images awarded.
	Distinct awarded users	Total awarded images
Image of the day
Top picks
Top pick nominations

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
Solar system
Extremely wide field
Star trails
Northern lights
Noctilucent clouds
Landscape

Distribution of data sources

This table shows the distribution of awards per data source, compared to the popularity of images acquired from that data source.
	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
Traveller
Own remote observatory
Amateur hosting facility
Public amaeteur data
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	9027131
PixInsight job	OSGLJ60GFYXW699NA2DFDPQ3M6J4SNJR
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	06h08m25s.35
RA (top/left)	06h10m04s.54
RA (top/right)	06h10m03s.85
RA (bottom/right)	06h06m45s.91
RA (bottom/left)	06h06m46s.38

Dec (center)	-06°24′17″.9
Dec (top/left)	-07°01′02″.7
Dec (top/right)	-05°47′24″.4
Dec (bottom/right)	-05°47′27″.3
Dec (bottom/left)	-07°01′13″.7

Image Index:

Contribution Index (beta):

NGC 2170, The Angel Nebula

NGC 2170, The Angel Nebula

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Image Index:

Contribution Index (beta):

NGC 2170, The Angel Nebula

NGC 2170, The Angel Nebula

Equipment

Acquisition details

Description

Comments

Sky plot

Histogram

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