NGC2174 (Sharpless 2-252)

Emission Nebula in Orion

Uploaded 1/23/07

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This enigmatic object is half a degree across, and extends out past my frame field. None the less, the 12.5" reveals on the right side a spectacular shock front, where interstellar molecular clouds are colliding creating bright ridges of nebulosity. Of very special note on this image is the nebulas strong color gradient toward the central star, a very hot 6.9 magnitude type O6 star, which ionizes the nebulosity. Near this star, the nebulosity has great amounts of H-beta emissions, and thus the core is very magenta colored. As we extend outward from this star the coloration becomes pink, then deep red around the edges as the H-beta lines decrease in amplitude and H-alpha dominates. For a deep schmidt camera shot of this region click here.

Processing Notes:

Nearly every bright star in this image was badly bloomed, but the Starizona debloomer proved its worth once again in cleaning them up superbly. No noise reduction was used here, a good clean signal to noise was achieved by taking additional red exposures an incorporating them into the R data for the RGB color data and averaging them in to keep the ratios the same.

Instrument: 12.5" f/5 Home made Newtonian Mount: Astrophysics 1200 QMD CCD Camera: SBIG 10XME NABG with Enhanced Water Cooling Guider: SBIG ST4 w/Lumicon Newt Easy Guider Exposure: LRGB = 120:80:20:20 (RGB unbinned ) AstroDon RGB Combine Ratio: 1: 1.05: 1.11 Location: Payson, Arizona, Elevation: 5150 ft. Sky: Seeing FWHM = 12 arcsec (Maxim DL - 10min subframe), Transparency 8/10 Outside Temperature: 19 F CCD Temperature: -30 C Image Processing Tools: Maxim DL: Calibration, deblooming (Starizona Debloomer), aligning, stacking Gralaks Sigma: Stacking PixInsight: Curves, Deconvolution Photoshop CS2: Curves, Color Correction, Gradient removal (Grad Xterminator), Cleanup HOME GALAXIES EMISSION NEBS REFLECTION NEBS COMETS GLOBULARS OPEN CLUST PLANETARIES LINKS


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