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Instrument |
12.5" RCOS @
~f/9 (2880 mm fl) 0.64 arcsec / pixel. Zoomify image scale is
0.85 to 3.29 arcsec / pixel. |
|
Mount |
Paramount ME |
|
Camera |
SBIG STL-11000 w/ internal filter wheel, AstroDon Gen I Filters |
|
Acquisition Data |
5/16/2010 to 6/9/2010
Chino Valley, AZ... with CCDAutoPilot3 & CCDSoft, AOL guided |
|
Exposure |
Lum (no filter)
405 min (27 x 15 min, bin 1x1)
RGB
180 min ( 4 x 15 min each, bin 2x2) |
|
Software |
-
CCDSoft, CCDStack,
Photoshop CS w/ the Fits Liberator plugin. Noel Carboni's actions
and Russell Croman's GradientXTerminator.
-
eXcalibrator for (b-v), (v-r) color calibration, using 5 stars from
the NOMAD1 database.
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PixFix32 (pre-beta) to
repair hot/cold pixels and column defects.
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CCDStack to calibrate,
register, normalize, data reject, combine the sub exposures, LRGB
color, and luminance deconvolution.
-
PhotoShop for LLRGB
combine &
on-linear stretching.
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Comment |
North is to top.
Abell 2256 is a
cluster of galaxies, located at a distance of about 900 million
light-years, in the constellation Ursa Minor. The cluster contains
over 500 galaxies, with NGC 6331 as the brightest at magnitude 12.8.
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