NGC 1747 Four Ways (Alex Woronow)

Celestial hemisphere: Southern · Constellation: Dorado (Dor) · Contains: NGC 1718 · NGC 1735 · NGC 1747 · NGC 1774

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NGC 1747 Four Ways

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NGC 1747 Four Ways

NGC 1747 Four Ways

OTA: CDK17
Camera: QHY600
Observatory: Deep Sky West. Chile

Exposures:
R: 9 x 300 sec
G: 11 x 300
B: 11 x 300
H: 20 x 1800 sec
O: 17 x 1800
S: 20 x 1800
Total Exposure time used: 30.5 hours

Note: L was tossed—wasted telescope time! Adding L to an image with sufficient RGB does not add any detail to an image, despite myths to the contrary.

Image Width: 40 arcSec

I processed this image in four ways. All images were processed in PI, underwent emission-line extraction using my script Narrowband Assistant, and were mapped to their approximate RGB wavelengths. I took somewhat different paths for the four images.

Image A, the one shown by default, uses HSO-extracted emission lines calibrated in PCC with the assumption of broadband stars.

Image B is the same, but with the assumption of narrowband stars selected in PCC.

Finally, image C is a simple blend of images A and D.

Image D is probably nearest to the most common approach to processing a natural-color version using SHORGB. The SHO was mapped to its RGB wavelengths and blended with the RGB channels.

All images visited Topaz, and the narrowband ones got a little touch-up of the blue tones in 3DL Creator.

There are many more things one could do with these data to get a wide variety of results. Not every narrowband image has to use that eye-wrenching Hubble Palette!

Alex Woronow

P.S., Clearly, the perspective that “we get all the detail from the L” is flawed.

Final
Original
B
C
D

B

Title: See description for Image B

Uploaded: ...

C

Title: See description

Uploaded: ...

D

Title: See Description

Uploaded: ...

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
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Star trails
Northern lights
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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	7193249
PixInsight job	04S04L7V16W9220RX4FNP8ELWWWTNVG1
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	04h55m14s.567
RA (top/left)	04h58m38s.110
RA (top/right)	04h51m51s.826
RA (bottom/right)	04h51m47s.185
RA (bottom/left)	04h58m40s.833

Dec (center)	-67°10′21″.23
Dec (top/left)	-66°57′00″.87
Dec (top/right)	-66°56′53″.43
Dec (bottom/right)	-67°23′24″.93
Dec (bottom/left)	-67°23′32″.49

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NGC 1747 Four Ways

NGC 1747 Four Ways

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NGC 1747 Four Ways

NGC 1747 Four Ways

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