Location & Date	Backyard, Abbott Observatory- Long Island, NY,  January 2021
Telescope	Orion ED80 F/7 ED, Moonlite focuser, Losmandy G11 Gemini Image scale 2.54 arcsec/pixel
Camera	SBIG ST-2000XM Baader Ha SII OIII 5nm filters CCD temp -20°C
Exposures	Ha-21x10m   SII-18x10m   OIII=24x10m  Bin 1x1
Planning & Acquisition	Image planning - Sequence Generator Pro Image acquisition - Sequence Generator Pro w/PinPoint & PHD2 (guiding)
Processing	CCDStack - calibration, align, normalize, combine, deconvolution Adobe Photoshop - Ha OIII SII Image composition, Noise reduction, JPEG conversion Topaz AI - selective sharpening Mapped color  Ha=green  SII=red  OIII=blue

Wikipedia

IC 443 (also known as the Jellyfish Nebula and Sharpless 248 (Sh2-248)) is a galactic supernova remnant (SNR) in the constellation Gemini. On the plane of the sky, it is located near the star Eta Geminorum. Its distance is roughly 5,000 light years from Earth. IC 443 may be the remains of a supernova that occurred 3,000 - 30,000 years ago. The same supernova event likely created the neutron star CXOU J061705.3+222127, the collapsed remnant of the stellar core. IC 443 is an extended source, having an angular diameter of 50 arcmin (by comparison, the full moon is 30 arcmin across).

IC443 Hydrogen Alpha (Ha)

IC443 Oxygen (OII)

IC443 Sulfur (SII)