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Click the image for a 73%
size wide field view. (2850 x 1900 - 1.78 MB)
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Instrument |
12.5" RCOS @
~ f/9 (2880 mm fl) at 0.64 arcsec/pixel. Shown at 0.88 and
1.89 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 |
10/1/2020 &
10/3/2020 Chino Valley, AZ. with CCD Commander & TheSkyX. AOL
guided |
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Exposure |
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RGB |
240 min (16 x
5 min. each) Bin 1x1 |
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Software & Processing Notes
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TheSkyX, CCDStack,
PixInsight, Photoshop CS6.
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eXcalibrator
v6.2 for (g:r),(b:r)
color balancing, using 1,199 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 the sub exposures.
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PixInsight
processing includes
CosmeticCorrection,
data rejection, mean combine the sub-exposures,
MureDenoise, create the RGB
image,
gradient removal and non-linear stretching with HistogramTransformation,
BackgroundNeutralization and StarNet to create a star mask.
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PhotoShop for additional background neutralization and
JPEG creation.
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Comment
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The cluster is shown
rotated 165° clockwise.
John Herschel
discovered NGC 7394 in 1829, in the constellation Lacerta and
catalogued it as a cluster. NGC 7394 is a beautiful scattered group
of 10 or 12, 9 to 11 magnitude stars. There is little written about
the cluster. It is quite possible that NGC 7394 is simply a random
grouping of stars. Interestingly, the Simbad database does not give
it an object type it all. However, NED does indicate that it is in
fact a cluster. |
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