Emission Nebula in Cepheus

Uploaded 9/17/06

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This is the very first CCD image with my ST10xme through the SV80s Refractor. It is essentially a shot to confirm focus ability, and to test the spacer I had to install on the Televue FF to keep it from jamming into the filter wheel. I followed this image with a shot through the 12.5" of the same subject. The comparison will be interesting!

Object Details:

Surrounding the dim but moderately rich open cluster IC1590 is Sharpless2-184, also known as NGC281. The nebula is quite large, spanning over half a degree in size, filled with dark Bok globules, the birthplace of stars. The cluster on the other hand is a respectable 7.4 magnitude, but only 4 minutes in size.


If you look at the brighter stars, they seem to have an extra diffraction spike. That was from the cord from the ST4 Autoguider hung unfortunately in front of part of the objective. Using the 12 inch for a guider creates lots of headaches, as the differential flexure was obvious in this image. Also, there were SO many stars, that the nebulosity was almost blotted out with bright stars. Applying the minimum filter at 50% through an alpha channel mask made quick work of the bright stars and reduced them to allow the nebula to shine through.

Instrument: Stellarvue SV80s with Televue .8x FF Platform: Astrophysics 1200 QMD CCD Camera: SBIG 10XME NABG with Enhanced Water Cooling Guider: SBIG ST4 Exposure: RGB = 10:10:10 RGB Combine Ratio: 1: 1.05: 1.11 Filters: AstroDon RGB Tricolor Location: Payson, Arizona Elevation: 5150 ft. Sky: Seeing FWHM = 6 arcsec (Maxim DL - 10min subframe), Transparency 8/10 Outside Temperature: 55 F CCD Temperature: -20 C Processing Tools: Maxim DL, Gralaks Sigma, Photoshop, PixInsight, CCDOps Debloomer. HOME GALAXIES EMISSION NEBS REFLECTION NEBS COMETS GLOBULARS OPEN CLUST PLANETARIES LINKS


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