IC443 - The Jellyfish Nebula (JDJ)

Celestial hemisphere: Northern · Constellation: Gemini (Gem) · Contains: 10 Gem · 11 Gem · 12 Gem · 7 eta Gem · 8 Gem · 9 Gem · Gem A · IC 443 · IC 444 · Sh2-248 · Sh2-249 · Tejat Prior · The star Propus (ηGem)

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IC443 - The Jellyfish Nebula

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IC443 - The Jellyfish Nebula

The Jellyfish Nebula (IC443) is a supernova remnant located in the constellation Gemini. Data captured on the nights of February 21/22/29 and March 7, 2020. Image was captured using an APO refractor and full spectrum modified DSLR through a dual narrowband filter. The H-alpha data (red channel) and OIII data (green & blue channels) were combined using the HOO palette.

Imaged with WO GT81 at F4.7 (382 mm focal length) using Flat6A II field flattener/0.8x reducer, Optolong L-Enhance dual narrowband filter, and full spectrum modified Nikon D5300. Total integration time of ~6 hours using 63 subs at ISO400x360 sec.

Pre-processed using PixInsight Batch Pre-Processing (BPP) script. Images calibrated using darks, flats, and flat darks. Extracted red/green/blue channels using BatchChannelExtraction script. R and G+B channels registered and stacked using StarAlighment and Integration. R and G+B channels individually post-processed in Pixinsight: Cropped, gradient removal with ABE, MLT for noise reduction, stretched using masked stretch, Curves Transformation, TGVDenoise for noise reduction, HDR transform, Local histogram transform, morphological transform to shrink stars. HOO image generated using SHO-AIP script with luminance using Ha+OIII data.

The refractors!
Cloudy Nights
DSLR narrowband
Optolong L-eNhance filter
Suburban Astrophotography

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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
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Star trails
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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	Advanced success
Started	...
Astrometry.net job	3637416
PixInsight job	HGX3M0TF9TU6E3CSZ44WIPJNGDKEJV4B
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	06h17m16s.33
RA (top/left)	06h22m31s.61
RA (top/right)	06h20m49s.94
RA (bottom/right)	06h11m53s.40
RA (bottom/left)	06h13m47s.92

Dec (center)	+22°44′36″.7
Dec (top/left)	+21°20′43″.6
Dec (top/right)	+24°24′54″.10
Dec (bottom/right)	+24°08′11″.2
Dec (bottom/left)	+21°04′17″.5

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IC443 - The Jellyfish Nebula

IC443 - The Jellyfish Nebula

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IC443 - The Jellyfish Nebula

IC443 - The Jellyfish Nebula

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