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Click the image for a ~ 50%
size view. (1600 x 1200 - 1.34 MB)
SH2-83 @ 150% resolution
(North is to the top)
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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 9.38 arcsec/pixel. |
|
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 |
9/12/2017 to
9/16/2017
Chino Valley, AZ with CCD Commander & CCDSoft. |
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Exposure |
|
RGB |
300 min. (10
x 10 min. each) Binned 1x1 |
RGB
combine ratios are 1.00,
0.96, 1.04 |
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Software |
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PixInsight
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eXcalibrator v5.0 for
(g:r)
color balancing, using 61 stars from the APASS database.
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PixInsight
processing includes calibration, registering, stacking, RGB
creation, gradient removal, non-linear stretching
with HistogramTransformation and a slight color saturation boast.
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Comment |
North is to the
bottom.
The Coat Hanger,
formally named Collinder 399, is a bright asterism in the
constellation of Vulpecula. The grouping is about 2 1/2 times wider
than the full Moon. Near the bottom left edge, is the small emission
nebula Sh2-83.
Persian astronomer, Al Sufi, first described the star grouping as a
"nebulous object" in his Book of Fixed Stars in 964. Binoculars or a
telescope at very low power is needed to view group as the Coat
Hanger asterism. Al Sufi did not have optical aids and the
coathanger was not invented until the late 1800's.
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