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IC443 - The Jellyfish Nebula


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IC 443 – The Jellyfish Nebula




IC 443, also listed in the Sharpless Catalogue as Sh2-248, is a Supernova remnant in the constellation of Gemini. When the massive star at the core of the new nebula fully depleted its thermonuclear fuel, it imploded, forming a neutron star. The outer layers of the star then collapsed inward and then bounced out again in a supernova explosion. The nebula gets its common name from its uncanny resemblance to a jellyfish, complete with tendrils.

The age of the nebula remains uncertain with estimates ranging from 3,000 to 30,000 years – not an exact science then! Its distance from Earth is generally accepted as being 5,000 light years.

The Nebula is rich in Ha and SII emission but less so in OIII so unusually for me, I used the Hubble palette to produce this image and concentrated on getting a good number of OIII subframes under the best atmospheric conditions to ensure that I had sufficient data to help achieve an interesting colour balance against the Ha and SII data.

Image Stats

Mount: Mesu 200
Telescope: Sky-Watcher Esprit 150
Flattener: Sky-Watcher Esprit specific
Camera: QSI 683 WSG-8
Filter: Astrodon 3nm Ha, 3nm OIII and Baader 8nm SII
Subframes: 22 x 1800 sec bin 1x1 Ha, 25 x 1800 sec bin 1x1 OIII, 18 x 900 sec bin 1x1 SII
Integration: 27.5 hours
Control: CCD Commander
Capture: MaxIm DL
Calibration, Stacking and Deconvolution: PixInsight
Post-Processing: PhotoShop PS3







06° 18' 26.0"


+22° 30' 28.0"






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