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The Jellyfish Nebula in Gemini
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The Jellyfish Nebula, also designated IC443, is a large supernova remnant in the constellation Gemini. The supernova explosion is suggested to have occurred approximately 30,000 years ago. The emission of the nebula is due to the excitation of hydrogen atoms as the expanding shell collides with the surrounding molecular gas (shock wave). The image was taken with a TeleVue 140 f/5 refractor and a SBIG STF8300c camera (OAG with ST-i) on an Astro-Physics 1200 mount. Total combined exposure of 3 hr 20 min (10 x 1200 sec lights @-20 degrees C, dithered; 21 darks, 128 bias, 128 flats). Acquisition MaxIm DL 6; Images calibrated, registered, integrated, and processed in PixInsight 1.8.3 with final adjustments with Adobe Photoshop CC.
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