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5
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Click the image for a ~ 58% size view. (2100 x
1400 - 1.15 MB)
|
Instrument |
12.5" RCOS @
~ f/9 (2880 mm fl) at 0.64 arcsec/pixel. Shown at 1.11 and
3.10 arcsec/pixel. |
|
Mount |
Paramount ME |
|
Camera |
SBIG STL-11000 w/
FW8 filter wheel & AstroDon Gen-2 RGB filters. |
|
Acquisition Data |
10/24/2015 to
11/2/2015 Chino Valley, AZ. with CCD Commander & CCDSoft. AOL
guided |
|
Exposure |
|
RGB |
540 min (12 x
15 min. each) Bin 1x1 |
eXcalibrator RGB ratios are 1.00,
1.00 & 1.30 |
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Software & Processing Notes
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-
CCDSoft, CCDStack,
PixInsight, Photoshop CS6.
-
eXcalibrator
v6.0 for
(g:r), (b:r)
color balancing, using
368 stars from the Pan-STARRS database.
-
CCDBand-Aid to repair
KAI-11000M vertical bars.
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CCDStack to
calibrate the sub exposures.
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PixInsight
processing includes calibration, registering, stacking, RGB
creation, gradient removal and non-linear stretching
with HistogramTransformation.
-
PhotoShop for a
weak green cast removal with HLVG, a slight Lab Color saturation
and JEPG creation.
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Comment
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The north is to the
top.
NGC 663 is an open cluster
of about 400 stars. It is
in the constellation Cassiopeia, at a distance of about 7,000
light-years. With an age of 20 - 25 million years, NGC 663 is very
young.
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