Contains:IC 443, The star Propus (ηGem)
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IC 443 Supernova Remnant (Jellyfish Nebula) in Gemini

Technical card

Resolution: 3310x2778

Dates: March 20, 2018

Astrodon 3nm OIII: 26x1800" bin 1x1
Astrodon 3nm SII: 1x1800" bin 1x1
Astrodon 3nm SII: 10x600" bin 2x2
Blue: 20x15" bin 2x2
Green: 20x15" bin 2x2
Ha 3nm: 12x1800" bin 1x1
Ha 3nm: 8x600" bin 2x2
Red: 10x15" bin 2x2

Integration: 22.7 hours

Avg. Moon age: 2.99 days

Avg. Moon phase: 9.76% job: 2013058

RA center: 94.105 degrees

DEC center: 22.493 degrees

Pixel scale: 1.437 arcsec/pixel

Orientation: 0.054 degrees

Field radius: 0.863 degrees

Locations: The Hills Observatory, Manchester, United Kingdom


Here is my narrowband image of the Jellyfish Nebula with RGB stars.

My aim with this image was to show more of the OIII component and to that end more than half of the integration time was devoted to OIII capture.

The NB images were processed using the tone mapping technique where all the stars are removed, the data is then processed to enhance detail etc and the stars are added back from the RGB data. All calibration and most of the processing was done in PixInsight and star removal and final assembly of the image is performed in Photoshop.

The colours are mapped as follows:

Ha = Red
OIII = Blue
SII = Yellow

Using these colours you can clearly see that the redder nebula in the top left corner (part of the IC444 nebula) is quite different from the more orange colour of the SN remnant. The orange coming from the mix of Ha and SII, there being very little SII in the IC444 nebula visible in this image.

All the NB filters are Astrodon 3nm filters.

I also have a wider field of this nebula in Ha



Mike Oates
License: None (All rights reserved)

Sky plot

Sky plot


IC 443 Supernova Remnant (Jellyfish Nebula) in Gemini, 


        Mike Oates