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Click the image for a ~ 50%
size view. (1600 x 1200 - 1.12 MB)
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Instrument |
Takahashi FSQ-106ED @
f/5.0 (530 mm F.L.) Captured at 2.1 arcsec/pixel. Shown at
4.40 and 9.39 arcsec/pixel. |
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Mount |
Paramount MyT |
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Camera |
SBIG STF-8300M Self
Guiding Package w/ mono ST-i, using AstroDon E-Series RGB filters. |
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Acquisition Data |
8/7/2016 to 8/13//2016
Chino Valley, AZ with CCD Commander & CCDSoft. |
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Exposure |
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RGB |
1770 min. (59
x 10 min. each) binned 1x1 |
RGB ratios are 1.00,
1.22, 0.90 |
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Software |
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CCDSoft, PixInsight & Photoshop CS6.
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eXcalibrator v5.0 for
(g:r)
color balancing, using 37 stars from the APASS database.
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PixInsight
processing includes calibration, registering, stacking, RGB
creation, gradient removal, non-linear stretching
with HistogramTransformation .
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PhotoShop for the final touch up.
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Comment |
North is to the
top.
IC 4603 is a nebula in
the constellation Ophiuchus. It is usually classified as a blue
reflection nebula. The SIMBAD database classifies it as a bright
nebula surrounding the bright star SAO 184376. The brightness
of the star washes out the reflected color giving the nebula a
nearly white appearance.
Above, and extending out of the field of view, is the large blue
reflection nebula IC 4604. The triple star, Rho Ophiuchi,
illuminates this nebula.
The bright stars illuminating IC 4603 and IC 4604 are about 400 to
440 light years from Earth. |
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