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Click the image for a 67%
size wide field view. (2400 x 1600 - 1.24 MB)
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Instrument |
12.5" RCOS @
~ f/9 (2880 mm fl) at 0.64 arcsec/pixel. Shown at 0.95 and
3.05 arcsec/pixel. |
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Mount |
Paramount ME |
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Camera |
SBIG STL-11000 w/
FW8 filter wheel & AstroDon Gen-2 RGB filters. |
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Acquisition Data |
10/2/2017 to
10/6/2017 Chino Valley, AZ. with CCD Commander & CCDSoft. AOL
guided |
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Exposure |
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RGB |
480 min (16 x
10 min. each) Bin 1x1 |
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Software & Processing Notes
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CCDSoft, CCDStack,
PixInsight, Photoshop CS6.
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eXcalibrator
v6.2 for (g:r),(b:r)
color balancing, using 533 stars from the Pan-STARRS database.
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CCDBand-Aid to repair
KAI-11000M vertical bars.
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CCDStack to
calibrate all sub exposures.
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PixInsight
processing includes
CosmeticCorrection,
data rejection, mean combine all the sub-exposures, create the RGB
image,
gradient removal and non-linear stretching with HistogramTransformation.
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PhotoShop for additional background neutralization and background smoothing.
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Noiseware 5, a PhotoShop plug-in.
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Comment
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The cluster is shown
rotated 160° clockwise.
NGC 129 is an open
cluster in the constellation Cassiopeia. It was discovered by
William Herschel in 1788. It is located almost exactly halfway
between the bright stars Caph (β Cassiopeiae) and γ Cassiopeiae. It
is large but not dense and can be observed by binoculars, where the
most obvious is a small triangle of stars of magnitude 8 and 9,
located in the center of the cluster. NGC 129 is at a distance 5,400
light-years and is about 76 million years old.
Source:
WikipediA |
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