Jellyfish Nebula SH2-248, IC443, LBN844 (Alastairmk)

Celestial hemisphere: Northern · Constellation: Gemini (Gem) · Contains: Gem A · IC 443 · The star 12 Gem

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Jellyfish Nebula SH2-248, IC443, LBN844

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Jellyfish Nebula SH2-248, IC443, LBN844

This SHO image of the Jellyfish Nebula was acquired from my backyard observatory over 11 nights throughout November and December 2022. I framed the picture and processed the data to bring out the plume of nebulosity that rises from behind the head of the jellyfish, the blue halo around the main nebula, to capture the faint dust background and to show the reflection nebula around the star 12 Gem at the top right.

All of the subframes were narrowband exposures of 480s with unity camera gain and almost all were at -20C. Total integration was for 19.7 hours:
Ha/NII 5nm 43x480s
SII 3nm. 41x480s
OIII 3nm. 64x480s

Processing in Pixinsight:
Calibration and CosmeticCorrection
NormalizedScaleGradients to reduce light pollution gradients
MureDenoise
DBE and ABE
DynamicCrop
BlurExterminator
Creation of starless tone maps with StarExterminator
NoiseExterminator on each channel
ColorCombination with PixelMath boosting SII 2x and OIII 3x
Stretching SHO image with GeneralizedHyperbolicStretch
Ha stars extracted using GHS
Combination of stars with starless image and final tweaking with CurvesTransformation

NOVAC
Light Polluted skies

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	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
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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.
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	7691128
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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Jellyfish Nebula SH2-248, IC443, LBN844

Jellyfish Nebula SH2-248, IC443, LBN844

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Jellyfish Nebula SH2-248, IC443, LBN844

Jellyfish Nebula SH2-248, IC443, LBN844

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