Emission Nebula in Puppis

Uploaded 1/27/05

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 There are numerous objects in Puppis that skim the horizon low on January evenings, and this one is one of the very best. Surrounding the loose open cluster NGC2467 in the center of this field is the extensive emission nebula Sharpless 2-311 which extends over the entire 1 degree field. Another open cluster that is actually inside NGC2467 is to the upper right of center, and is Haffner 18. Seldom in the sky do you find two open clusters with one inside the other! The small open cluster Haffner 19 and a small round emission nebulosity that on some charts is LBN1066 is seen along the top of the frame, just left of center. The brightest star in the field is SAO174730 at 7.8th magnitude.

Processing notes: As is usual for such objects low on the horizon, I had to change the color mix ratios slightly to include a bit more blue in the mix. Atmospheric extinction reddens low object, and attenuates the blue wavelengths. This nebula is much more pink in the center than most, and no doubt its higher level of excitation produces more green and blue spectral lines in the densest regions.

Instrument: 12.5" f/5 Home made Newtonian Platform: Astrophysics 1200 QMD CCD Camera: SBIG ST8i NABG with Enhanced Cooling Guider: SBIG ST4 Exposure: RGB = 20:20:40 RGB Combine Ratio: 1: .8: 1.4 Filters: RGB Tricolor Location: Payson, Arizona Elevation: 5150 ft. Sky: Seeing FWHM = 6.0 arcsec (Maxim DL - 10min subframe), Transparency 7/10 Outside Temperature: 5 C CCD Temperature: -20 C Processing Tools: Maxim DL, Photoshop, PixInsight HOME GALAXIES EMISSION NEBS REFLECTION NEBS COMETS GLOBULARS OPEN CLUST PLANETARIES LINKS


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