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.
The remnant’s age is still uncertain. There is some agreement that the progenitor supernova happened between 3,000 and 30,000 years ago. Recent Chandra and XMM-Newton observations identified a plerion nebula, close to the remnant southern rim. The point source near the apex of the nebula is a neutron star, relic of a SN explosion. The location in a star forming region and the presence of a neutron star favor a Type II supernova, the ultimate fate of a massive star, as the progenitor explosion.
Imaging telescopes or lenses: Orion Optics UK CT8
Imaging cameras: SBIG ST-8300C, SBIG ST-8300M
Guiding telescopes or lenses: Orion Optics UK CT8
Guiding cameras: Starlight Xpress Lodestar guide camera
Focal reducers: Baader Planetarium RCC
Software: Maxim DL, photoshop
Filters: Baader Planetarium 7nm H-Alpha, Hutech IDAS LPS-P2
Accessories: Celestron Radial Guider
Dates: Dec. 3, 2013, Dec. 27, 2013
Baader Planetarium 7nm H-Alpha: 26×900″ bin 1×1
Hutech IDAS LPS-P2: 29×600″ bin 1×1
Integration: 11.3 hours
Author: Jacek Bobowik
AstroPhotography of the day by SPONLI 25 June 2014