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                                      IC443
                           Supernova Remnant in Gemini
     RA:06h 17m 15s  Dec: +22 31' 00" Distance - 5000 ly  Size - 70 ly

Click on image for larger size
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 -20C
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)