Flamming Skull Nebula (Sh2-68 in HOO) (José Manuel López Arlandis)

Celestial hemisphere: Northern · Constellation: Serpens (Ser)

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Flamming Skull Nebula (Sh2-68 in HOO)

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Flamming Skull Nebula (Sh2-68 in HOO)

The Flamming Skull Nebula (Sh2-82) is a planetary nebula located in the Serpent's tail. It is very old, at least 45,000 years old. Planetary nebulae results from the expansion of gas from dying medium-sized stars. When they are young, if they are in an environment rich in dust and gas, the pressure of the expelled gases is greater than that of the environment, maintaining a spherical shape. However, when aging occurs the surrounding gas slows down the expansion. As the original star moves, the shape of the nebula will change depending on the composition of its environment . The white dwarf at the center of Sh2-68 moves rapidly in a cloud of gas in our Milky Way. The shifting front is located at the top right in the photograph, giving rise to the reddish cloud, and stripes in this direction are also visible in the central bluish oxygen III cloud. The nebula is very faint, so in addition to spending a lot of time on its capture, I took the shots in bin x2 ,and stacked it with drizzle. I have verified that although the resolution is high, if you have a lot of images, the drizzle improves the SNR and detail. At the moment I'm only using bin X2 + drizzle on weak objects.

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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	8456490
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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Flamming Skull Nebula (Sh2-68 in HOO)

Flamming Skull Nebula (Sh2-68 in HOO)

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Flamming Skull Nebula (Sh2-68 in HOO)

Flamming Skull Nebula (Sh2-68 in HOO)

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