Jellyfish Nebula (Chris Kagy)

Celestial hemisphere: Northern · Constellation: Gemini (Gem) · Contains: 13 Gem) · 7 Gem) · Calx (μ Gem · Gem A · IC 443 · IC 444 · Part of the constellation Gemini (Gem) · Praepes (η Gem · Tejat Posterior · Tejat Prior · The star 12 Gem · The star 6 Gem · The star Propus · The star Tejat

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Jellyfish Nebula

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Jellyfish Nebula

This is the Jellyfish Nebula (IC 443, or Sharpless 248), a supernova remnant in our southern sky that is about 5000 light years away, in the constellation Gemini. Its age hasn't been pinned down, but its size is roughly 70 light years across. All supernovae remnants result from a big star that burned hot and fast and, when in ran out of fuel, exploded. We're seeing the result of that explosion. In this case, the yellow nebula is a combination of Hydrogen and Sulphur, and the red cloud to the left is mostly Hydrogen.

It's easy to toss out big numbers, like 5,000 light years, but they're hard to imagine. Here's a model to help. If our Solar System (Sun at the center, all the way out to Neptune) was shrunk to the size of a quarter, the Jellyfish Nebula would be just about 100 miles away and just about 1 3/4 miles across. Ponder that for a moment - how many quarters could fit along a 1 3/4 mile stretch of road? That's a lot of solar systems that could fit inside this thing.

NOVAC

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Distribution of astrophotographers

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	Distinct awarded users	Total awarded images
Image of the day
Top picks
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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
Northern lights
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Distribution of data sources

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	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
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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
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Astrometry.net job	7576515
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PixInsight queue size	n/a
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