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MOUSE-OVER
IMAGE FOR STARLESS VIEW - OR CLICK HERE FOR IR
IMAGE MOUSE-OVER VIEW
CLICK
ON IMAGE FOR FULL SIZE VIEW (6802x4607)
OR
Scope:
Celestron 9.25 Edge HD 235 mm at f/7;
Location: DAA Observatory, Shelter Valley, CA;
Dates: 3, 4, September, 2024; Camera: ASI294MM (Baader
Ha, OIII, RGB Filters)
Exposure:
Ha 84 x 3.5 minutes (gain-180 2x2), Lum 141 x 3 minutes (gain-121 2x2), RGB -
36 each x 2 minutes -
(gain-121 2x2). IR data comes from the WISE all sky 3,400 nm image
archive.
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Standard
Acknowledgment for Use of WISE Data:
"This
publication makes use of data products from the Wide-field Infrared Survey
Explorer, which is a joint project of the University of California, Los Angeles,
and the Jet Propulsion Laboratory/California Institute of Technology, funded by
the National Aeronautics and Space Administration."
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Processing: Data Acquisition - N.I.N.A. (as FITs). Sub-frame calibration - Pixinsight
(WBPP). Sub-frame registration and integration (Average combine -
Linear fit clipping, 2X drizzle for Ha, Lum) - PixInsight (WBPP).
Noise reduction - NoiseXTerminator (RGB, Ha, Lum) - PixInsight. Non-linear stretching for
Ha, Lum -
PixInsight. RGB combine and stretching, Photometric RGB calibration (SPCC)
- PixInsight. De-convolution - BlurXTerminator (AI4) - PixInsight.
Generation of starless Ha, Lum, and RGB image for later processing -
StarXTerminator (PixInsight). RGB stars (lower stretch) for star size control - PixInsight.
Ha starless combined in HOO (OIII neutral) resulting in an Ha
colored starless image - Pixinsight. Ha colored starless screened into LRGB starless (with
mask to focus on Ha regions) - Affinity Photo. LRGB stars screened into final Ha-LRGB starless image -
Affinity Photo. Final finishing -
Affinity Photo. Annotation - PixInsight, Aladin (Simbad), and Affinity
Photo. This image is a Narrow Band Ha / LRGB (starless) with LRGB stars. Image processed at 8288x5644
resolution (2x drizzle stacks). Full Field image size is approximately 6802x4607.
WISE IR
image was acquired from the IRSA image data server and plate solved in
PixInsight. it was registered to the HaLRGB image with 'Mosaic by Coordinates - Pixinsight. IR image colorized (green/yellow) and screened into
the HaLRGB image - Affinity Photo
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Description: North is down in
this image (180°). The reflection nebula, vdB 155 is in the lower
left; the star forming region, Cepheus A SFR is toward the upper right. Both of these structures are from 2,300 to 2,600 light years distant. The image
also has the dark nebulae Dobashi 3404, 3406, 3408, 3413, 3414, and 3418.
The reflection nebula GN 22.55.2 is in the upper right corner and is coincident
with the ISM object GM 3-14.
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The
Cephelus A SFR (or Cep A SFR) is a high mass, star forming region
that has been extensively studied. Star formation is very active and
very concentrated. Unfortunately it is not well seen in the visible
light spectrum in the image above and dust clouds significantly obscure
their presence. However in the IR spectrum (wavelength 3,400 nm), it's
presence becomes pronounced. The IR data from WISE was combined with the
above image and the greater extent and intensity can be seen in
the IR mouse-over image. |
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These objects, information, and some of the brighter
stars are identified in the full
size annotated
image. The Horizontal Full FOV is approximately 0.67 degrees. Full size, full field image scale is approximately
0.35 arcsec/pix. |
Image
center approximately - Equatorial 2000: RA: 22h 54m 55s Dec: +62°07'05"
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