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NGC281
Emission
Nebula in Cepheus
Uploaded
9/17/06
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.
Notes:
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.
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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.
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