M20/21 - The Trifid Nebula

Emission/Reflection/Dark Nebula in Sagittarius

Uploaded 8/29/05

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 There are few objects in the sky that show a combination of both emission and reflection nebulosities so clearly as the Trifid. At first glance, this image looks very blue. That is because nearly the entire field of view is filled with dim reflection nebulosity. Only in the upper left corner, and within the dust lanes in the emission portion do you see the actual neutral tinted sky. The dark lanes cutting through the nebulosity is in front of the nebula blocking the light beyond. Much of it is brownish or yellow tinted, caused by the spectral absorption of dust of blue wavelengths.

The upper red nebulosity is M20 with the internal dark lanes are Barnard 85. The blue part of the nebulosity is also M20, but separately is LBN27. The field here spans half a degree wide, and easily contains the brightest portions, however the blue part spills out into the surrounding fields.

Instrument: 12.5" f/5 Home made Newtonian Platform: Astrophysics 1200 QMD CCD Camera: SBIG 10XME NABG with Enhanced Cooling Guider: SBIG ST4 Exposure: B+L(RGB) = 20:60:20:20:20 (RGB Binned 2x2) RGB Combine Ratio: 1: 1.05: 1.11 Filters: AstroDon RGB Tricolor Location: Payson, Arizona Elevation: 5150 ft. Sky: Seeing FWHM = 5.5 arcsec (Maxim DL - 10min subframe), Transparency 7/10 Outside Temperature: 55 F 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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