IC 4628: A Mixed View in Wideband and Ha (Fernando)

Celestial hemisphere: Southern · Constellation: Scorpius (Sco) · Contains: IC 4628

IC 4628: A Mixed View in Wideband and Ha , Fernando

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IC 4628: A Mixed View in Wideband and Ha

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IC 4628: A Mixed View in Wideband and Ha

IC 4628 is a large and faint emission nebula, of about 250 light-years across, located some 6,000 light-years away from Earth in the southern constellation of Scorpius (the Scorpion).

The nebula is a huge region filled with gas and clumps of dark dust. These gas clouds are star-forming regions, producing brilliant hot young stars. In visible light, these stars appear as a blue-white colour, but they also emit intense radiation in other parts of the spectrum, most of them in ultroviolet. That is the reason we can see a blueish color on the top left side of the image.

It is this ultraviolet light from the stars that causes the gas clouds to glow. This radiation strips electrons from hydrogen atoms, which then later recombine and release energy in the form of light. Each chemical element emits. IC 4628 is an example of an HII region (ionised hydrogen).

We can also see dark nebulae strucutures all over the image. The big one in the middle of the image is catalogued as Bernard-48.

This image was acquired in 4 days, according to the following stack:

Luminance: 15x20 minutes

RGB: 20x10 minutes each channel

Ha: 20x25 minutes

All bin 1x1

Scope: Skywatcher Esprit 120mmf/7

Camera: ST-8300M

Mount: Skywatcher Eq-6 Pro

CCD Guider: Lodestar

Capture Software: Maxim DL

Pre and Post-Processing: PixInsight

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
Artificial satellite

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	Basic success
Started	...
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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IC 4628: A Mixed View in Wideband and Ha

IC 4628: A Mixed View in Wideband and Ha

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IC 4628: A Mixed View in Wideband and Ha

IC 4628: A Mixed View in Wideband and Ha

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