• IC 443, the Jellyfish Nebula
    • Sh2-248 in Gemini
    Annotated image
  • The Jellyfish Nebula, IC 443 or Sh2-248, is an SNR or
  • supernova remnant in the constellation Gemini.
  • Hover over the image for an annotated view.
  • Date:  15 February and 4 March 2024
  • FOV:  Apporoximately 6° 52' × 4° 35'
  • Telescope:  Askar FRA300 pro (300mm f/5 Petzval)
  • Guiding:  ZWO ASI120MM mini mono guide camera,
  • SVBony SV165 Mini 40mm f/4 guide scope
  • Computer:  ASIair pro Raspberry Pi
  • Mount:  ZWO AM5 mount
  • Camera:  ZWO ASI6200MC Pro Cooled (-10°C) Color CMOS
  • Pixel size:  3.76 μm
  • Resolution:  2.597 arcsec/pixel
  • Filter:  Baader Semi-Apo filter (moon, light pollution, flare) 15 February,
  • Optolong L-eNhanced 4 March 2024
  • Frames:Two data sets, 14 February 2024, one set 4 March 2024
  • 73 × 240 seconds × 300 gain,
  • 30 × 15 seconds × 300 gain,
  • added with HDRComposition in Pixinsight
  • 32 × 240 seconds × 300 gain,
  • Total Time:  7 hours 7 minutes 30 seconds
  • Calibration:  20 flats, 20 dark flats, and 20 darks per session
  • Processing:  Pixinsight – HDRCombination, SPCC, DBE, SPCC, BlurXT, NoiseXT,
  • GHS, HST, MStr, PixelMath MStr + GHS + HST → PM,
  • StarXT, Starless, HDR8, NoiseXT, PixelMath blend in Stars
  • Location:  Stony Creek Boat Launch near Henderson, NY