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Instrument |
Takahashi FSQ-106ED @
f/5.0 (530 mm F.L.) Captured at 2.1 arcsec/pixel. The Zoomify
image scale is 2.80 to 9.77 arcsec / pixel. |
|
Mount |
Losmandy G11 with Gemini L4 v1.0 |
|
Camera |
SBIG STF-8300M Self
Guiding Package w/ mono ST-i, using Astrodon filters. |
|
Acquisition Data |
9/25/2012 to 10/21/2012 Chino Valley, AZ... with CCDAutoPilot5
& CCDSoft. Off-axis guided. |
|
Exposure |
|
Hα
|
525 min. (35 x 15 min.
bin 1x1)
|
Click
here for the RGB color image.
Click
here for the color-mapped narrow band images. |
|
Software |
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CCDSoft, CCDStack,
Photoshop CS6, PixInsight and Noel Carboni's actions.
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CCDStack to calibrate,
register, normalize, data reject, combine the sub exposures.
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PixInsight for
gradient removal and the
initial non-linear stretching.
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PhotoShop for final touch-up.
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Noiseware Pro, a PhotoShop plug-in.
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Comment |
North is to the right.
Sharpless 157, the
Claw Nebula, is a bright emission nebula in the constellations
Cassiopeia and Cepheus at a distance of about 8,000 light-years. At
the bottom-right is the open star cluster NGC 7510, about 9,900
light-years away.
This image, captured
with a hydrogen-alpha filter, shows the extent of the hydrogen gas.
In true color it glows with the red light characteristic of hydrogen
atoms recombining with long lost electrons, stripped away (ionized)
by energetic starlight. |
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