NGC 1491 in Perseus
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CLICK ON IMAGE FOR FULL SIZE VIEW (2600x1950) Scope: FSQ-106N at f/5, Location: DAA Observatory, Shelter Valley, CA 18 November 2017, Camera: Atik 383L (Astronomik Gen 2 Ha LRGB Filters) Exposure:
Exposure: 12 x 10 min (1x1 bin) exposure with UV/IR block, 12 x 10 minutes
(2x2 bin) exposure with Hydrogen Alpha filter, 8 x 4 min (2x2 bin) RGB
exposures.
Processing: Data
Collection - Sequence Generator Pro (as FITs). Calibrated, stacked
(Kappa Sigma Combine) - Deep Sky Stacker. LRGB channel registration,
equalization - Astroart. Curves, Levels, RGB
combine - ImagesPlus. Luminance Layering, final stretch, and finishing -
Photoshop. RGB calibration - eXcalibrator. This image is a RGB combine
with Luminance layering. Color saturation in LAB color. The H-Alpha
filter exposure was screen blended into the IR/UV Blocking filter exposure stack
and used for the
luminance layer. Ha was screen blended into the Red channel - emission
balance of RGB done with Channel Mixer in Photoshop. Images processed at 3352 x 2532 resolution. Final Image size is approximately
2600 x 1950. North is up in this image. The
primary object in this image is LBN 705. The better known object in NGC 1491 which
is the small bright portion of the larger LBN 705. NGC 1491 is also known
as Sharpless 206 and LBN704. Below this relatively bright emission complex is a
dimmer emission nebula LBN 706. The open cluster King 7 is in the upper
right. This cluster is about
7,170 light years distant from Earth. Below King 7 and to the left a
little is the small reflection nebula GM 1-34. This is from the
Gyulbudaghian+Maghakian catalog of new HH-like reflection nebulae. There are also a few background galaxies
in the image as well. These objects and some
of the brighter stars are identified in the annotated
image. This image replaces an earlier image that can be seen in the Archives
here.
Horizontal FOV is approximately 120 arc minutes. Image center is approximately - Equatorial 2000: RA: 04h 02m 50.4s Dec: +51°20'24"
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