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Click the image for a larger,
42% size,
view. (1900 x 1350 - 1.39 MB)
With the stars dimmed, we see more detail in the nebula.
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Instrument |
Pentax Super Takumar
200mm @ f/4, circa 1969. Aquired at 4.42 arcsec/pixel. Shown at
27.15 and 16.85 arcsec/pixel. |
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Mount |
Losmandy G11 with Gemini L4 v1.0,
unguided |
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Camera |
Canon EOS Rebel T5i
(no modifications) |
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Acquisition Data |
7/2/2016 to 7/7/2016
Chino Valley, AZ w/ CCD Commander and TheSkyX |
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Exposure |
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Raw ISO
800 No Filters |
625 min (250 x
2.5 min) |
eXcalibrator RGB ratios are 1.00,
1.01, 1.12 |
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Software |
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Pixinsight and
Photoshop CS6.
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eXcalibrator
v5.0 (beta) for (g:r) color balancing, using
54 stars from the APASS database.
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PixInsight
processing includes calibration, debayering, registeration, stacking, gradient repair,
non-linear stretching with HistogramTransformation and
ACD_noise_reduction.
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PhotoShop for the final
touch-up.
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Noiseware 5, a PhotoShop plug-in.
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Comment |
North is to the
bottom. Up-side-down it looks like a horse.
IC 4592 (also known as
the Blue Horsehead Nebula) is a reflection nebula in the
constellation Scorpius at a distance of about 400 light-years.
The nebula is illuminated by the bright star, Nu Scorpii. |
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