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Monday, March 2, 2020

Supernova remnant IC 443 wide field

The imaging season up here 65N will end in a month since we are rapidly running out of darkness. I spend last Friday night with the Jellyfish nebula, IC 443, in Gemini.
The current imaging system takes me deep very fast, Tokina AT-x 300mm f2.8 camera lens, Astrodon narrowband filters and Apogee Alta U16 camera. This combination has turned to be a very nice imaging tool inteed.

IC 443, NGC 2175 & Messier 35
Click for a large image, it's worth it!

Mapped colors from the emission of ionized elements, R=Sulfur, G=Hydrogen and B=Oxygen.
A star cluster Messier 35 at upper right, IC 443 at middle left and NGC 2175 at lower right.

H-alpha alone
Click for a large image

3h of light emitted by an ionized hydrogen, H-alpha.


One of the reasons i took this image is the "Monkey head nebula", NGC 2175, at lower right corner.
I have shot this area with a much longer focal length back in 2015. At my image there is a very faint extended shape visible in my photo. I wanted to see, if I'm able to catch it with my current imaging system as well. This very dim feature is strongly visible in my new photo too! (Monkey head nebula is rotated 180 degrees in large image below.)

Older long focal length photo of NGC 2175 from Spring season 2015, more info here,

IC 443

IC 443 (also known as the Jellyfish Nebula and Sharpless 248 (Sh2-248)) is a Galactic supernova remnant (SNR) in the constellation Gemini. It locates visually near the star Eta Geminorum at distance of about 5000 light years.
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

Technical details

Processing workflow

Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack2.
Deconvolution with a CCDStack2 Positive Constraint, 33 iterations, added at 50% weight
Color combine in PS CS3
Levels and curves in PS CS3.

Imaging optics
Tokina AT-x f2.8 camera lens

10-micron 1000

Cameras and filters
Imaging camera Apogee Alta U16 and Apogee seven slot filter wheel
Guider camera, Lodestar x 2 and an old spotting scope of Meade LX200
Astrodon filters,
5nm H-alpha 3nm S-II and 3nm O-III

Total exposure time 
H-alpha, 9 x 1200 s, binned 1x1 = 3 h
O-III, 3 x 1200 s, binned 2x2 = 1 h
S-II, 3 x 1200 s. binned 2x2 = 1 h

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