Cassiopeia A - supernova remnant (James E.)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas)

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Cassiopeia A - supernova remnant

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Cassiopeia A - supernova remnant

Processing this target was interesting. The remnant, although dim, was somewhat bright in SII and OIII as well as RGB; however, there was virtually zero Ha present. The background had Ha with an OIII cloud above and to the right of the remnant. The combine colors were somewhat colorful in RGB and mostly purplish in the SII/OIII combine. I ended up using a combination of the two images with an emphasis on keeping the image colorful - similar to SHO processing of the Crab Nebula.

Cassiopeia A (Cas A) is a supernova remnant and the brightest extrasolar radio source at frequencies above 1 GHz. The supernova occurred about 11,000 light years away within the Perseus Arm and is estimated to have been visible sometime between 1662 and 1700. No contemporary record exists of its having been observed - aside from a possible sighting by English astronomer John Flamsteed in 1680 - so the explosion may have taken place behind an interstellar dust cloud or the source star's previously ejected outer layers. Cas A was among the first discrete astronomical radio sources found and is approximately 10 light years across. (Wikipedia)

Taken over several nights: Sep 30; Oct 1, 13, 15-18, 2021.

Original
Final
F

ZWO ASI2600MM Pro
Schmidt-Cassegrain Telescope (SCT) Imagers
NOVAC
N.I.N.A. Users
Narrowband imaging
Images from the EdgeHD Series

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Status	Advanced success
Started	...
Astrometry.net job	5156401
PixInsight job	5TZBG6BA2IDM8OE82FI6Q334AUOH1E37
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	23h23m23s.267
RA (top/left)	23h25m05s.217
RA (top/right)	23h21m53s.802
RA (bottom/right)	23h21m42s.566
RA (bottom/left)	23h24m51s.625

Dec (center)	+58°52′16″.60
Dec (top/left)	+59°05′57″.94
Dec (top/right)	+59°07′19″.93
Dec (bottom/right)	+58°38′29″.20
Dec (bottom/left)	+58°37′05″.97

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Cassiopeia A - supernova remnant

Cassiopeia A - supernova remnant

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Cassiopeia A - supernova remnant

Cassiopeia A - supernova remnant

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