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Contains:  IC 443, The star Propus (ηGem)
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IC 443 Jellyfish Nebula in Ha & OIII, 


            Douglas J Struble
IC 443 Jellyfish Nebula in Ha & OIII

IC 443 Jellyfish Nebula in Ha & OIII

Technical card

Resolution: 2304x2880

Dates:Feb. 14, 2017March 7, 2018March 11, 2018

Astrodon Ha 5nm: 83x240" (gain: 139.00) -20C bin 1x1
Astrodon Ha 5nm: 69x300" (gain: 139.00) -20C bin 1x1
Astrodon OIII 3nm: 125x240" (gain: 139.00) -20C bin 1x1

Integration: 19.6 hours

Darks: ~50

Flats: ~50

Bias: ~250

Avg. Moon age: 20.83 days

Avg. Moon phase: 62.45%

Bortle Dark-Sky Scale: 6.00 job: 2281195

RA center: 94.376 degrees

DEC center: 22.543 degrees

Pixel scale: 1.599 arcsec/pixel

Orientation: 294.333 degrees

Field radius: 0.819 degrees

Data source: Backyard


This is a blend of data from last year using a Stellarvue 102mm Raptor and the year using a SV70T in a Ha and OIII BiColor palette.

The astonishing shape of the Jellyfish Nebula (IC 443) is a supernova remnant in Gemini. It's due to the resulting shock waves colliding with a molecular front, creating the 'blowback' of billowing strands seen in this image. IC 444 is the nebulous area seen at the top of the image. The two bright golden stars are Mu Geminorum and Eta Geminorum (Propus). This region is estimated to be some 5000 light years from earth.



Douglas J Struble
License: None (All rights reserved)

Sky plot

Sky plot


IC 443 Jellyfish Nebula in Ha & OIII, 


            Douglas J Struble