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Monday, March 19, 2012
I managed to get some data for second part of two frame mosaic of IC 443, SNR, and NGC 2174, the "Monkey Head Nebula". Nights are getting shorter and shorter very fast, up here 65N. In a two weeks, we'll be out of astronomical darkness for a six months.
A two frame mosaic of IC 443, NGC 2174 and Sharpless objects 247, 254, 255, 256 and 257
In constellation Gemini
HST-palette, from the emission of ionized elements, R=Sulfur, G=Hydrogen and B=Oxygen.
Note. A largish image, about 2 meg and 1200 x 1600 pixels.
Closeup of IC 443
A closeup from bottom Right, Sharpless objects 254, 255, 256 and 257
A closeup from top Right, Messier 35
A closeup from middle Right, Sharpless 247, Sh2-247, at Right
Image in visual spectrum
Image is in visual spectrum from narrowband channels.
IC 443, also known as Sharpless 248 (Sh2-248) or the "Jellyfish Nebula", is a supernova remnant in the constellation Gemini at distance of about 5000 light years. The actual size of the SNR is roughly 70 light years. This image spans about 10 degrees of sky. (Twenty Moons side by side in the sky.)
At top Right lays an open group, Messier 35.
At bottom Right, the Sharpless object 247, Sh2-247, can be seen as a bright dot.
NGC 2174, the "Monkey Head Nebula", (OCL 476 or Cr 84) is an open cluster surrounded by emission nebula in Gemini at distance of about 6400 light years.
Constellation Gemini, Simeis 147 can be seen at upper Right.
Older version of IC 443, shot with Tokina AT-X 300mm f2.8 lens and QHY9 at February 2009, can be seen here:
http://astroanarchy.blogspot.com/2009/02/ic443-in-hst-palette.html Colors in this new image are partly borrowed from this older one.
A closeup of NGC 2175, the "Monky Head Nebula"
A study about the apparent scale in the sky can be seen here:
Processing work flow:
Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack2.
Levels, curves and color combine in PS CS3.
Optics, Canon EF 200mm camera lens at f1.8
Guiding, Meade LX200 GPS 12" and a Lodestar guider
Image Scale, ~5 arc-seconds/pixel
Only four 1200s exposures of H-alpha emission for both panels.
Other channels, O-III and S-II, are from an older image of mine.
(Link above, under "Older versions")