NGC6744 - Spiral Galaxy in Pavo (Aaron H.)

Celestial hemisphere: Southern · Constellation: Pavo (Pav) · Contains: IC 4823 · NGC 6744

NGC6744 - Spiral Galaxy in Pavo, Aaron H.

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NGC6744 - Spiral Galaxy in Pavo

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NGC6744 - Spiral Galaxy in Pavo

NGC6744 (Caldwell 101) is an intermediate spiral galaxy in the constellation Pavo. This galaxy, with its flocculent arms, is considered one of the best nearby analogs to the Milky Way. The presence of the distorted companion, NGC6744A, adds to the parallels with our own galaxy.

This target has a low-surface brightness, so has been challenging to capture well. I've attempted to image it several times in the past with my OSC camera, but always gave up quickly due to the faintness of the target.

This time around, the capture was aided by the addition of luminance data from my new ASI2600MM camera. When the camera arrived, I had seven hours of RGB data taken with my OSC camera and approximately five hours of dual-narrowband data. To test out the new camera, I decided to add a some luminance data (using the UV/IR cut filter with the mono camera). After the first session, I compared the mono luminance data with synthetic luminance extracted from the RGB stack, and found that the two hours of luminance data I had captured compared favourably with the synthetic luminance extracted from seven hours of RGB data. So I proceeded to capture ten hours of mono luminance data. I then captured three more hours of RGB data to make it roughly ten hours each, and proceeded to processing.

The RGB and Luminance stacks were combined, with the addition of Ha data from the dual-narrowband filter (extracted through continuum subtraction). I went through several revisions of the processing to achieve good contrast around the galaxy core. In the end, iterative applications of global MTF and GHS stretches provided a more satisfying result than masked transforms in this case.

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	Distinct awarded users	Total awarded images
Image of the day
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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
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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
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Amateur hosting facility
Public amaeteur data
Professional, scientific grade data
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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.
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Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
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Status	Basic success
Started	...
Astrometry.net job	8503845
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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NGC6744 - Spiral Galaxy in Pavo

NGC6744 - Spiral Galaxy in Pavo

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Image Index:

Contribution Index (beta):

NGC6744 - Spiral Galaxy in Pavo

NGC6744 - Spiral Galaxy in Pavo

Equipment

Acquisition details

Description

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