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Contains:  IC 443, The star Propus (ηGem)
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IC 443 - Jellyfish Nebula, 


            Walter Koprolin
IC 443 - Jellyfish Nebula

Technical card

Resolution: 1600x1207

Dates:Feb. 23, 2019

Frames: 52x1200"

Integration: 17.3 hours

Avg. Moon age: 19.12 days

Avg. Moon phase: 80.07% job: 2822761

RA center: 6h 16' 36"

DEC center: +22° 33' 39"

Pixel scale: 2.069 arcsec/pixel

Orientation: 3.379 degrees

Field radius: 0.576

Locations: Floridsdorf, Vienna, Austria

Data source: Backyard


The Jellyfish Nebula IC 443 is a supernova remnant (SNR) in the constellation Gemini, which is located near the 3rd magnitude star η Geminorum (near the right edge of the image). It is about 5,000 light years distant from Earth. IC 443 is a large SNR, having an angular diameter of 50 arcmin with a shell-like morphology. The supernova explosion which produced the nebula has occurred up to 30,000 years ago. The SNR emits X-rays which are produced by a neutron star hidden within the nebula, which is likely the collapsed remnant of the core of the original star which exploded in the supernova. IC 443 is heavily interacting with surrounding molecular clouds.

The nebula emits all of its light in isolated emission lines. The most prominent of these are the lines Hα, [OIII] and [SII], which were recorded exclusively to capture the image shown above. This is a "natural color" composition that is mixed so that the resulting colors come close to the visible spectrum of the human eye. The following mixture was used:

Red = Hα + 24% [SII]
Green = [OIII]
Blue = [OIII] + 15% Hα to compensate for missing Hβ



Walter Koprolin
License: None (All rights reserved)

Sky plot

Sky plot


IC 443 - Jellyfish Nebula, 


            Walter Koprolin