Daily Archives: April 13, 2015

IC 443, Jellyfish Nebula, Sharpless 248


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 plan 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 one of the best-studied cases of supernova remnants interacting with surrounding molecular clouds.

Imaging telescopes or lenses: Canon EF 300mm F/2.8 L IS
Imaging cameras: Starlight Xpress SX-814 Trius Monochrome CCD
Mounts: iOptron ZEQ25GT
Guiding telescopes or lenses: Teleskop-Service 8×50 Finderscope
Guiding cameras: ZW Optical ASI120MM
Software: Main Sequence Software Sequence Generator Pro,  PixInsight,  Lightroom 5
Filters: Baader Planetarium 36mm SII,  Baader Planetarium 36mm OIII,  Baader Planetarium 36mm Ha
Resolution: 3302×2320
Dates: April 8, 2015
Baader Planetarium 36mm Ha: 23×300″ -20C bin 1×1
Baader Planetarium 36mm OIII: 11×300″ -20C bin 1×1
Baader Planetarium 36mm SII: 12×600″ -20C bin 1×1
Integration: 4.8 hours
Flats: ~20
Bias: ~500
Avg. Moon age: 18.01 days
Avg. Moon phase: 88.53%
RA center: 94.797 degrees
DEC center: 22.842 degrees
Pixel scale: 2.593 arcsec/pixel
Orientation: -0.163 degrees
Field radius: 1.454 degrees
Locations: Komakallio, Kirkkonummi, Finland
Author: Jari Saukkonen

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