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Click the image for a larger view.
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Instrument |
Takahashi FSQ-106ED @
f/5.0 (530 mm F.L.) Captured at 2.1 arcsec/pixel. Shown at 4.2
and 9.38 arcsec / pixel.l. |
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Mount |
Losmandy G11 with Gemini L4 v1.0 |
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Camera |
SBIG STF-8300M Self
Guiding Package w/ mono ST-i, using Baader LRGB filters. |
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Acquisition Data |
7/31/2013 to 11/32013 Chino Valley, AZ... with CCDAutoPilot5
& CCDSoft. |
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Exposure |
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Lum |
450
min. (30 x 15 min. bin 1x1) |
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Lum |
150
min. (30 x 5 min. bin 1x1) |
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Red |
110 min. (22 x 5 min. each bin
1x1) |
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Green |
130 min. (26 x 5 min. each bin
1x1) |
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Blue |
155 min. (31 x 5 min. each bin
1x1) |
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Software & Processing Notes |
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CCDSoft, CCDStack,
PixInsught, Photoshop CS6
and Noel Carboni's actions.
.
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No SDSS stars were available for color balancing, so a standard
image-train color calibration was used, as determined by
eXcalibrator v4.2, and then adjusted for altitude extinction.
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CCDStack to calibrate,
register, normalize, data reject, combine the sub exposures and
create the RGB image.
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PixInsight for
gradient removal and initial non-linear stretching.
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PhotoShop for the LRGB
combine & final touch-up. FreeHDR was used to combine
the 15 and 5 minute luminance exposures.
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Noiseware Pro, a PhotoShop plug-in.
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Atlantic Light Works FreeHDR, a PhotoShop plug-in.
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Comment |
The image is rotated
90 degrees clockwise
The Iris Nebula is a
bright reflection nebula in the constellation Cepheus, at a distance
of about 1,300 light-years. The nebula, LBN 487, surrounds the star
cluster NGC 7023. LBN 487 is primarily illuminated by SAO 19158, a
hot bluish magnitude 7 star. The characteristic blue color, of the
Iris, is a result of blue light being more efficiently scattered by
the dust. |
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