Sh2-188 (Roberto Marinoni)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas)

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Sh2-188

Link: https://www.robertomarinoni.com/

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Sh2-188

Link: https://www.robertomarinoni.com/

Sh2-188 is a planetary nebula in the constellation Cassiopeia.
Although included in the Sharpless Catalog, it is actually a planetary nebula, located 711 light-years away from the Solar System.
It appears as a well-marked envelope on one side and very dispersed on the other, where it appears to have already dissolved.
Through its speed of expansion an age of about 7500 years has been determined. Although its appearance resembles a supernova remnant, this possibility has been ruled out due to the nature of its emissions (info from Wikipedia)

For the nebula itself I used the HaOIII combination, while RGB was used only for the stars.
My initial idea was to try to reveal even the faintest parts of the nebula, but during the processing I realized that I had underestimated their brightness and the collected frames did not allow them to be adequately detached from the sky background.
But I'm still quite happy with the end result :-)

Astrofili Dalai Lama
Planetary Nebulae
Imagers of Italy
Imaged with Voyager

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	Basic success
Started	...
Astrometry.net job	7181697
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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Sh2-188

Sh2-188

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Sh2-188

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