IC 443 - The Jellyfish nebula (Alessandro Cernuzzi)

Celestial hemisphere: Northern · Constellation: Gemini (Gem) · Contains: 10 Gem · 11 Gem · 12 Gem · 13 mu. Gem · 6 BU Gem · 7 eta Gem · 8 Gem · 9 Gem · Gem A · IC 443 · IC 444 · Part of the constellation Gemini (Gem) · Sh2-248 · Sh2-249 · Tejat Posterior · Tejat Prior · The star Propus (ηGem) · The star μGem

Powered byPixInsight

IC 443 - The Jellyfish nebula

Powered byPixInsight

IC 443 - The Jellyfish nebula

A wide filed of the Jellyfish nebula, IC443, sitting between the stars Tejat (left) Propus (right).

This is a 4hrs and 35min at ISO400 some very hazy 5min subs ( due to some high clouds ), for an experiment regarding the preservation of dynamic range through low ISO setting. I don't believe it worked. I think that we're dealing with such faint objects that, despite 5 min exposures, the sensor did not convert photons fast enough to produce a good signal. The subs were nice looking but the signal was so hidden within them that the stretch in post actually produced more noise. I think I'll stick to my usual iso1600/800, it seems clear that's a better option, in my case, at least.

I also came up with a workflow to use Starnet++ to reduce the number of stars, just taking care of the smaller ones.

Despite all the issues I think this is a good image, in my humble capabilities.

Peace & clear skies

-William Optics Zenithstar61 with flattener 61.

-iOptron Skyguider pro, modified with the declination bracket of the Skywatcher Star Adventurer.

-iPolar camera for polar alignment.

-Canon SL2 with Baader modification filter, dummy battery powered.

-ZWO 30mm guidescope.

-ZWO ASI120MM Mini guide camera.

-Optolong L-eNhance

-Skywatcher 1.75" steel tripod.

-Z-Bolt GalaxyIII blue laser

-Diy nichrome wired dew bands heaters.

-Power source: diy four Lifepo4 battery cells with BMS (135Ah, 12V)

-5 min subs, for a total of 4hrs and 35min at ISO400, Bortle 8

-24 darks

-30 bias

-30 flats

-iPolar software

-Astrophotography Tool

-PHD2 guiding

-Deep Sky Stacker

-Starnet++

-Photoshop.

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	Advanced success
Started	...
Astrometry.net job	3982409
PixInsight job	VXJXZ0HZ6Y12SSTJSHK1MR0NFOYROPOC
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	06h19m09s.24
RA (top/left)	06h26m17s.10
RA (top/right)	06h11m42s.45
RA (bottom/right)	06h12m09s.10
RA (bottom/left)	06h26m29s.43

Dec (center)	+23°00′45″.4
Dec (top/left)	+24°09′46″.1
Dec (top/right)	+24°02′55″.2
Dec (bottom/right)	+21°50′33″.7
Dec (bottom/left)	+21°57′18″.9

Image Index:

Contribution Index (beta):

IC 443 - The Jellyfish nebula

IC 443 - The Jellyfish nebula

Equipment

Acquisition details

Description

Comments

Sky plot

Histogram

		...
You have no new notifications.

Image Index:

Contribution Index (beta):

IC 443 - The Jellyfish nebula

IC 443 - The Jellyfish nebula

Equipment

Acquisition details

Description

Comments

Sky plot

Histogram

Notifications

AstroBin is in READ ONLY mode

Sorry :-(

Sorry :-(

Sorry :-(

Are you really sure?

Warning!

Warning!

Are you sure?

Report abuse

Slideshow settings

IOTD/TP stats (last [x] days)

Distribution of astrophotographers

Distribution of subject types

Distribution of data sources

Sorry

Sorry

Share

Upload new revision

Upload uncompressed source (XISF/FITS/PSD/TIFF)

Delete image and all its revisions?

Delete original image?

Delete all other versions?

Delete all revisions?

IOTD/TP stats

The following people like this image

The following people bookmarked this image

Warning

Flag malfunctioning thumbnails

Contains

Remove yourself as a collaborator

Plate-solving information