IC 443 Widefield in Hydrogen Alpha
Magnitude: Approximately 12.0
Distance: 5000 light years
RA: 6h 17m 49s
Dec: 22 degrees 49' 00"
IC443 is a beautiful supernova remnant in the constellation Gemini,
produced by a supernova explosion thought to have occurred about 30,000
years ago. X-ray
are produced by a neutron star hidden deep within the nebula, which is
that remains of the original star. The neutron star is highly
and rapidly rotating, representing the end stage of a star with between
and 3 solar masses. In addition to hydrogen, the nebula is
comprised of other more complex elements such as oxygen, silicon,
carbon, and iron, which were created during the star's lifetime through
nuclear fusion .
These elements may someday become part of a solar system that
could support life.
Date: December 23 and 24, 2006.
FSQ106, on the G11 Losmandy
Autoguider: SBIG STV with
Camera: SBIG STL11000M, -20C
RGB filters; Baader 7nm Ha filter.
Exposures (unbinned): 19 x 20'
Ha (6.3 hour Ha exposure over 2 nights); 12 x 5'
R; 12 x 5' G; 15 x 8' B (4 hour RGB exposure). Total exposure
Conditions: Unseasonably warm and
aligned, and Sigma Clip combined in MaximDL, followed by
in ImagesPlus (IP). Subsequent processing in Photoshop CS (16
bit format). The RGB was
processed first, and then Ha was added back to the R, G, B channels
using lighten mode in the following percentages: 100% Ha (Red), 7%
Ha (Green), 15% Ha (Blue). Halos caused by the STL11K coverslip
removed individually in PS. Final color and detail adjusted using
the Selective Color tool in PS.
note: Graphics on this website
may not be reproduced without author permission.
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