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Click the image for a ~ 50%
size view. (1800 x 1200 - 0.79 MB)
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Instrument |
12.5" RCOS @ ~ f/9
(2880 mm fl) at 0.64 arcsec/pixel. Shown at 1.26 and 3.03 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 and 6mn Ha filters. |
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Acquisition Data |
7/7/2015 to 7/28/2015
Chino Valley, AZ with CCD Commander & CCDSoft. |
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Exposure |
|
Ha |
360 min. (24
x 15 min. each) binned 1x1 |
Click
here for the RGB color image. |
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Software |
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CCDSoft, PixInsight & Photoshop CS6.
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CCDStack to
calibrate the sub exposures.
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PixInsight to
register, normalize, data reject, combine the sub exposures,
gradient removal, non-linear stretching with
HistogramTransformation and ACDNR for noise reduction..
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PhotoShop for
the final touch up.
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Comment |
North is to the
top.
Sh2-98 is a faint
emission nebula, in the constellation of Cygnus, at a distance of
about 11,700 light-years. |
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