Sharpless 172 and 173 in Cassiopeia
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ON IMAGE FOR FULL SIZE VIEW (2600x1950) Scope:
Explore Scientific MN152 Maksutov Newtonian at f/4.8, Location: Pine Creek, CA,
5 August 2016
Camera: ST8300M (Baader Ha LRGB filters) Exposure:
Exposure: 15 x 8 min
(1x1 bin) exposure with IR/UV Block filter, 12 x 9 min (2x2 bin) exposure
with H-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, and gradient removal - 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 both the IR/UV Blocking filter exposure stack
and used for the
luminance layer. The H-Alpha filter exposure was also screen blended into
the Red filter exposure stack and used for the red channel. Images processed at 3352 x 2532 resolution. Final Image size is approximately
2600 x 1950. North is up in this image. Sharpless
173 is the large red nebula on the left;
Sharpless 172 is the very small, dim nebula in the lower right. The open cluster
NGC 103 can be seen in the lower left in this image. Sharpless 173 is also known
as LBN 593 and there are other designated objects of Dark and Bright Nebulae
within or nearby. The bright star in the upper left is 12 Cassiopeia. These objects are identified in the
annotated
image. Horizontal FOV is 85' Image
center is approximately - Equatorial 2000: RA: 00h 20m 13.5s Dec: +61°34'45"
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